Fundamentals of Engineering (FE) — Bachelor of Engineering — Questions and Answers

Question 1: Ohm's Law states that voltage equals current multiplied by which quantity?

Impedance
Inductance
Resistance (Correct answer)
Capacitance

Correct answer: Resistance

Ohm's Law (V = IR) states that voltage equals current times resistance for a linear circuit element.

Question 2: Which of the following relates to customer judgments of food?

Sensory Analysis (Correct answer)
Food physics
Product Development
Food microbiology

Correct answer: Sensory Analysis

Sensory analysis is a scientific discipline that uses human senses (sight, smell, taste, touch, hearing) to evaluate food and other products. It systematically measures, analyzes, and interprets responses to products as perceived by the senses. This field directly relates to understanding and quantifying customer judgments and preferences regarding food attributes.

Question 3: What does a transformer primarily use to transfer energy between circuits?

Resistive coupling
Mutual inductance (Correct answer)
Direct conduction
Capacitive coupling

Correct answer: Mutual inductance

A transformer transfers electrical energy between circuits via mutual inductance through a shared magnetic core.

Question 4: In environmental impact assessment (EIA), what is the purpose of the scoping phase?

To identify the significant issues and potential impacts that should be studied in detail (Correct answer)
To obtain permits from regulatory agencies
To implement mitigation measures
To write the final environmental impact report

Correct answer: To identify the significant issues and potential impacts that should be studied in detail

Scoping defines the boundaries and focus of an EIA by identifying which environmental issues, alternatives, and impacts warrant detailed study, reducing unnecessary analysis.

Question 5: What is a composite material?

A ceramic material fired at extremely high temperature
A polymer with a high degree of crosslinking
A material produced by alloying two metals
A material made from two or more constituent materials with different properties that produce a material with superior characteristics (Correct answer)

Correct answer: A material made from two or more constituent materials with different properties that produce a material with superior characteristics

Composites combine a reinforcement (e.g., carbon fiber, glass fiber) within a matrix (e.g., polymer resin, metal) to achieve properties neither component possesses alone, such as high strength-to-weight ratio.

Question 6: In Failure Mode and Effects Analysis (FMEA), the Risk Priority Number (RPN) is calculated as:

Frequency × Impact × Probability
(Severity × Occurrence) / Detection
Severity × Occurrence × Detection (Correct answer)
Severity + Occurrence + Detection

Correct answer: Severity × Occurrence × Detection

RPN = Severity × Occurrence × Detection, where each factor is rated 1–10; higher RPN values indicate failure modes that require priority corrective action.

Question 7: What is Fick's First Law of diffusion in materials science?

Diffusivity is independent of temperature
Atoms diffuse only along grain boundaries
The diffusion rate doubles with every 10°C temperature increase
The diffusion flux is proportional to the concentration gradient (J = -D dC/dx) (Correct answer)

Correct answer: The diffusion flux is proportional to the concentration gradient (J = -D dC/dx)

Fick's First Law states J = -D(dC/dx), where J is diffusion flux, D is diffusivity, and dC/dx is the concentration gradient; flux is proportional to and opposite in direction to the gradient.

Question 8: What is the Hall-Petch relationship in materials science?

Fatigue life is inversely proportional to grain size
Hardness decreases with increasing grain boundary area
The yield strength of a metal increases as grain size decreases (Correct answer)
Ductility improves with coarser grain size

Correct answer: The yield strength of a metal increases as grain size decreases

The Hall-Petch equation (σy = σ₀ + k/√d) shows yield strength increases as grain size (d) decreases, because more grain boundaries impede dislocation motion.

Question 9: What is the crystal structure of most common metals at room temperature called?

Amorphous
Diamond cubic
Simple cubic
Face-Centered Cubic (FCC), Body-Centered Cubic (BCC), or Hexagonal Close-Packed (HCP) (Correct answer)

Correct answer: Face-Centered Cubic (FCC), Body-Centered Cubic (BCC), or Hexagonal Close-Packed (HCP)

Most engineering metals adopt FCC (e.g., aluminum, copper), BCC (e.g., iron, tungsten), or HCP (e.g., titanium, zinc) crystal structures depending on their atomic bonding.

Question 10: In chemical kinetics, what does a second-order reaction with respect to reactant A mean?

The rate is proportional to the square of A's concentration (Correct answer)
A reacts in two separate steps
The rate doubles when temperature doubles
Two moles of A are produced per reaction

Correct answer: The rate is proportional to the square of A's concentration

A second-order reaction in A means the rate law is r = k[A]², so doubling [A] quadruples the reaction rate.

Question 11: What is the primary greenhouse gas produced by human activities contributing to climate change?

Nitrogen (N₂)
Oxygen (O₂)
Argon (Ar)
Carbon dioxide (CO₂) (Correct answer)

Correct answer: Carbon dioxide (CO₂)

CO₂ from fossil fuel combustion, deforestation, and industrial processes is the dominant anthropogenic greenhouse gas driving global warming.

Question 12: What is the glass transition temperature (Tg) of a polymer?

The temperature below which a polymer transitions from a rubbery to a glassy, brittle state (Correct answer)
The temperature at which a polymer melts completely
The temperature at which a polymer crosslinks
The temperature at which a polymer begins to oxidize

Correct answer: The temperature below which a polymer transitions from a rubbery to a glassy, brittle state

Below Tg, polymer chain segments lose mobility and the material becomes rigid and brittle (glassy); above Tg, the polymer is rubbery and flexible.

Question 13: What does the Knudsen number indicate in gas dynamics?

Ratio of mean free path to characteristic length (Correct answer)
Ratio of thermal to kinetic energy
Ratio of compressibility to viscosity
Ratio of inertial to viscous forces

Correct answer: Ratio of mean free path to characteristic length

The Knudsen number (Kn = λ/L) determines whether continuum fluid mechanics applies or whether rarefied gas dynamics must be used.

Question 14: Synthesis gas and acetylene are two examples of .

Secondary gaseous fuels (Correct answer)
Liquid fuels
Primary gaseous fuels
Gaseous fuels

Correct answer: Secondary gaseous fuels

They are secondary gaseous fuels since synthesis gas and acetylene both result from certain processes and are naturally gaseous. Calcium carbide can be hydrolyzed to produce acetylene.

Question 15: Which type of semiconductor device is commonly used as a voltage regulator in simple circuits?

Zener diode (Correct answer)
PIN diode
Tunnel diode
Schottky diode

Correct answer: Zener diode

A Zener diode maintains a nearly constant voltage across its terminals when reverse biased beyond its breakdown voltage, making it ideal for voltage regulation.

Question 16: In fluid mechanics, what does the Reynolds number represent?

The ratio of pressure forces to surface tension
The ratio of thermal to momentum diffusivity
The ratio of buoyancy to viscous forces
The ratio of inertial forces to viscous forces in a fluid flow (Correct answer)

Correct answer: The ratio of inertial forces to viscous forces in a fluid flow

The Reynolds number (Re = ρVL/μ) indicates whether a flow is laminar (low Re) or turbulent (high Re) by comparing inertial and viscous forces.

Question 17: What is the purpose of age hardening (precipitation hardening) in aluminum alloys?

To improve electrical conductivity
To eliminate residual stresses after machining
To increase strength by forming fine precipitates that impede dislocation movement (Correct answer)
To reduce brittleness at low temperatures

Correct answer: To increase strength by forming fine precipitates that impede dislocation movement

Precipitation hardening involves solution heat treatment, quenching, and controlled aging to form fine dispersed precipitates within the matrix, which block dislocation motion and increase yield strength.

Question 18: Ergonomics (human factors engineering) in an industrial engineering context focuses primarily on:

Reducing the unit cost of raw materials through supplier negotiation strategies
Designing work systems, equipment, and environments to match human physical and cognitive capabilities and limitations (Correct answer)
Developing full automation to eliminate manual labor from production processes
Maximizing machine utilization rates and production throughput speed

Correct answer: Designing work systems, equipment, and environments to match human physical and cognitive capabilities and limitations

Ergonomics applies knowledge of human anatomy, physiology, and psychology to design safe and efficient workplaces, tools, and tasks that fit the capabilities of the workers who use them.

Question 19: How is the configuration in a clamp if coal is the fuel?

Mixed and poured into a basin
Heaped (Correct answer)
Placed on a platform
Stacked in alternate layers

Correct answer: Heaped

In a clamp, which is a traditional and often temporary method for burning bricks, coal as fuel is typically arranged in a heaped configuration. This involves placing layers of bricks interspersed with layers of coal, with the coal often piled up or distributed unevenly. This arrangement facilitates the slow and continuous burning of the fuel, transferring heat to the bricks for their firing process.

Question 20: In a series RLC circuit at resonance, what is true about the impedance?

Impedance is zero
Impedance is at its minimum (Correct answer)
Impedance is at its maximum
Impedance equals inductance

Correct answer: Impedance is at its minimum

At resonance in a series RLC circuit, the inductive and capacitive reactances cancel, leaving only resistance, so impedance is minimized.

Question 21: The combustion products are cooled to _________ in order to determine the fuel's HCV.

200F
600F (Correct answer)
700F
400F

Correct answer: 600F

The combustion byproducts are cooled to room temperature, which is 600F or 150C. Steam is produced by turning hydrogen gas into steam.

Question 22: Which renewable energy source generates electricity by harnessing the kinetic energy of wind?

Geothermal plant
Hydroelectric dam
Solar photovoltaic panel
Wind turbine (Correct answer)

Correct answer: Wind turbine

Wind turbines convert the kinetic energy of moving air into rotational mechanical energy, which drives a generator to produce electricity.

Question 23: Which heat transfer mode does NOT require a medium for energy transmission?

Radiation (Correct answer)
Conduction
Advection
Convection

Correct answer: Radiation

Radiation transfers energy via electromagnetic waves and can propagate through a vacuum, unlike conduction and convection which require matter.

Question 24: Which of the aforementioned makes up the lion's share of natural gas?

Ethane
Methane (Correct answer)
Butane
Pentane

Correct answer: Methane

Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane. Methane (CH4) typically makes up 70-90% of natural gas, with smaller amounts of other hydrocarbons like ethane, propane, and butane, as well as non-hydrocarbon gases like nitrogen and carbon dioxide. Its high methane content makes it an efficient fuel source.

Question 25: Which logic gate produces a HIGH output only when all inputs are HIGH?

NAND
AND (Correct answer)
XOR
OR

Correct answer: AND

The AND gate outputs HIGH (1) only when every input is HIGH (1); any LOW input produces a LOW output.

Question 26: Which theorem states that any linear two-terminal network can be replaced by an equivalent voltage source in series with an impedance?

Thevenin's Theorem (Correct answer)
Norton's Theorem
Superposition Theorem
Kirchhoff's Theorem

Correct answer: Thevenin's Theorem

Thevenin's Theorem allows simplification of complex linear circuits into a single voltage source (Vth) in series with an equivalent resistance (Rth).

Question 27: In the context of the Hodgkin-Huxley model, what do the variables 'm', 'h', and 'n' represent?

Myelination factor, saltatory conduction velocity, and node density
Activation and inactivation gating variables for Na⁺ channels and activation gating for K⁺ channels (Correct answer)
Maximum conductance values for sodium, potassium, and chloride
Membrane capacitance, ion channel resistance, and leak conductance

Correct answer: Activation and inactivation gating variables for Na⁺ channels and activation gating for K⁺ channels

In the Hodgkin-Huxley model, 'm' and 'h' are voltage- and time-dependent gating variables governing sodium channel activation and inactivation, respectively, while 'n' governs potassium channel activation.

Question 28: Which equation describes the pressure drop for incompressible fluid flow through a pipe?

Darcy-Weisbach equation (Correct answer)
Bernoulli equation without friction terms
Hagen-Poiseuille restricted to laminar only
Clausius-Clapeyron equation

Correct answer: Darcy-Weisbach equation

The Darcy-Weisbach equation (ΔP = f·L/D·ρv²/2) applies to both laminar and turbulent incompressible flow in pipes.

Question 29: What is the primary objective of linear programming in industrial engineering?

To solve non-linear optimization problems using iterative algorithms
To design production schedules using discrete-event simulation
To maximize or minimize a linear objective function subject to linear constraints (Correct answer)
To model probabilistic systems and their outcomes

Correct answer: To maximize or minimize a linear objective function subject to linear constraints

Linear programming optimizes (maximizes or minimizes) a linear objective function subject to a set of linear equality or inequality constraints.

Question 30: In Six Sigma methodology, the DMAIC improvement cycle stands for:

Define, Measure, Analyze, Improve, Control (Correct answer)
Define, Monitor, Assess, Integrate, Complete
Design, Model, Analyze, Implement, Check
Design, Measure, Analyze, Improve, Control

Correct answer: Define, Measure, Analyze, Improve, Control

DMAIC is the structured Six Sigma improvement framework: Define the problem, Measure the current process, Analyze root causes, Improve the process, and Control the gains.

Question 31: What does the Fanning friction factor measure in pipe flow?

Ratio of turbulent to laminar velocity profiles
Pressure drop per unit length per unit density
Viscous dissipation in fittings only
Ratio of wall shear stress to kinetic energy per unit volume (Correct answer)

Correct answer: Ratio of wall shear stress to kinetic energy per unit volume

The Fanning friction factor is defined as the ratio of wall shear stress to the fluid's kinetic energy per unit volume (τ_w / (½ρv²)).

Question 32: Which of the following statements accurately describes the Hagen-Poiseuille equation?

Fluid is uniform
Fluid is compressible
Fluid is turbulent
Fluid is laminar (Correct answer)

Correct answer: Fluid is laminar

The Hagen-Poiseuille equation describes the pressure drop in an incompressible Newtonian fluid flowing through a long cylindrical pipe. A fundamental assumption for this equation to be valid is that the fluid flow must be laminar. It does not apply to turbulent flow, where the fluid motion is chaotic and characterized by eddies and vortices.

Question 33: What is the primary mechanism by which reverse osmosis (RO) purifies water?

Using UV light to destroy pathogens
Applying pressure to force water through a semi-permeable membrane that rejects dissolved contaminants (Correct answer)
Heating water to evaporate and recondense it
Adding chemicals that bind and precipitate impurities

Correct answer: Applying pressure to force water through a semi-permeable membrane that rejects dissolved contaminants

RO applies hydraulic pressure greater than osmotic pressure to push water through a dense membrane, which rejects ions, heavy metals, and dissolved solids while allowing water molecules to pass.

Question 34: Which of the following is not a fluid's global parameters?

External diameter (Correct answer)
Density
Viscosity
Mass flow rate

Correct answer: External diameter

Global parameters of a fluid describe its intrinsic properties or overall flow characteristics. Density and viscosity are intrinsic fluid properties, while mass flow rate describes the overall quantity of fluid passing a point per unit time. The external diameter, however, is a geometric property of the conduit the fluid is flowing through, not an intrinsic property of the fluid itself or a global flow parameter.

Question 35: In a three-phase power system, what is the phase difference between each phase voltage?

90 degrees
120 degrees (Correct answer)
60 degrees
180 degrees

Correct answer: 120 degrees

In a balanced three-phase system, the three sinusoidal voltages are each displaced by 120 degrees from one another.

Question 36: Which parameter is conserved along a streamline in inviscid, adiabatic flow according to Bernoulli's equation for compressible flow?

Static pressure
Total (stagnation) enthalpy (Correct answer)
Dynamic pressure
Mach number

Correct answer: Total (stagnation) enthalpy

For inviscid adiabatic flow, total enthalpy h0 = h + V²/2 is constant along a streamline, which generalizes Bernoulli's equation to compressible flows.

Question 37: Which effect causes an aircraft to experience a nose-up pitching moment when flaps are deployed?

Increased drag acts above the thrust line
Shift of the aerodynamic center forward of the center of pressure
Increase in lift acts behind the center of gravity
Increased camber moves the center of pressure aft relative to the center of gravity (Correct answer)

Correct answer: Increased camber moves the center of pressure aft relative to the center of gravity

Flap deployment increases camber and shifts the additional lift aft, moving the overall center of pressure behind the CG and creating a nose-down pitching moment (not nose-up); if this is reversed, it indicates CG is aft of the new lift center.

Question 38: Which modulation technique is used in WiFi (IEEE 802.11) for high-data-rate transmission?

ASK (Amplitude Shift Keying)
FM (Frequency Modulation)
AM (Amplitude Modulation)
OFDM (Orthogonal Frequency Division Multiplexing) (Correct answer)

Correct answer: OFDM (Orthogonal Frequency Division Multiplexing)

Modern WiFi standards use OFDM, which splits data across many closely spaced orthogonal subcarriers to achieve high throughput and robustness against multipath interference.

Question 39: What is a shape memory alloy (SMA)?

An alloy with zero thermal expansion
A material that conducts electricity only below a certain temperature
A material that returns to a pre-defined shape when heated after being deformed (Correct answer)
An alloy that changes color with temperature

Correct answer: A material that returns to a pre-defined shape when heated after being deformed

SMAs (e.g., Nitinol) exploit a reversible martensitic phase transformation: deformed at low temperature, they recover their original shape when heated above the transformation temperature.

Question 40: A prosthetic heart valve must be designed to withstand cyclic loading. Which material failure mode is most relevant to this long-term cyclic stress?

Fatigue failure from repeated stress cycles (Correct answer)
Brittle fracture from a single high-impact event
Creep failure under constant static load
Ductile overload failure from exceeding the yield strength

Correct answer: Fatigue failure from repeated stress cycles

A prosthetic heart valve opens and closes approximately 40 million times per year; fatigue failure, which occurs at stress levels below the yield strength after many cycles, is the dominant design concern.

Question 41: In finite element analysis (FEA) of a bone implant, what does 'mesh convergence' testing verify?

That refining the mesh (increasing element count) no longer significantly changes the stress results (Correct answer)
That the solver has correctly applied linear versus nonlinear material models
That the material properties assigned to bone elements match published literature values
That boundary conditions applied at the bone-implant interface are physically realistic

Correct answer: That refining the mesh (increasing element count) no longer significantly changes the stress results

Mesh convergence testing involves progressively refining the finite element mesh and comparing results; when further refinement produces negligible change in the stress or displacement solution, the mesh is considered converged and the results are reliable.

Question 42: What is the Vickers Hardness Test used to measure?

A material's resistance to fracture
A material's tensile strength
A material's resistance to permanent deformation by indentation (Correct answer)
A material's thermal conductivity

Correct answer: A material's resistance to permanent deformation by indentation

The Vickers hardness test presses a pyramid-shaped diamond indenter into the material surface under a defined load and measures the size of the resulting indentation to calculate hardness (HV).

Question 43: In polymer science, what is the degree of polymerization?

The number of repeating monomer units in a polymer chain (Correct answer)
The number of crosslinks per unit volume
The temperature at which a polymer fully melts
The ratio of crystalline to amorphous regions in a polymer

Correct answer: The number of repeating monomer units in a polymer chain

The degree of polymerization (DP) is the average number of monomer repeat units per polymer chain, directly related to molecular weight and influencing mechanical and thermal properties.

Question 44: Fouling in heat exchangers primarily results in which operational consequence?

Lower fluid viscosity on the shell side
Reduced pressure drop across tubes
Increased heat transfer coefficient
Increased thermal resistance reducing heat transfer (Correct answer)

Correct answer: Increased thermal resistance reducing heat transfer

Fouling deposits add an additional thermal resistance layer on heat transfer surfaces, reducing overall heat transfer efficiency.

Question 45: In fracture mechanics, what does the stress intensity factor (K) characterize?

The magnitude of stress at the tip of a crack in a material (Correct answer)
The total energy stored in a deformed body
The material's resistance to plastic deformation
The crack propagation speed

Correct answer: The magnitude of stress at the tip of a crack in a material

The stress intensity factor K quantifies the stress field singularity at a crack tip; when K exceeds the material's fracture toughness (K_IC), unstable crack propagation occurs.

Question 46: In orbit determination, what is the primary purpose of the state transition matrix?

To transform velocity to orbital elements
To convert between coordinate frames
To compute gravitational perturbations
To propagate the covariance matrix forward in time (Correct answer)

Correct answer: To propagate the covariance matrix forward in time

The state transition matrix maps how uncertainties in the initial state propagate over time, enabling Kalman filter covariance updates.

Question 47: In software engineering, what does an API (Application Programming Interface) provide?

A graphical interface for end users
A compiler for translating source code
A method for physically connecting hardware components
A defined set of protocols and tools for building software and allowing different applications to communicate (Correct answer)

Correct answer: A defined set of protocols and tools for building software and allowing different applications to communicate

An API defines a contract—methods, data formats, and protocols—that enables different software applications to interact and share functionality without exposing internal implementation.

Question 48: In a drug delivery system, what does 'zero-order release kinetics' mean?

Drug release that is triggered only by a specific pH in the surrounding tissue
Instantaneous release of the entire drug payload upon implantation
Drug release at a constant rate independent of the remaining drug concentration in the device (Correct answer)
Drug release rate that decreases exponentially as the drug concentration in the carrier drops

Correct answer: Drug release at a constant rate independent of the remaining drug concentration in the device

Zero-order kinetics describes a constant drug release rate over time, which is ideal for maintaining a steady therapeutic plasma concentration and avoiding peaks and troughs.

Question 49: What is the difference between thermoplastic and thermoset polymers?

Thermoplastics cannot be recycled under any conditions
Thermosets have lower melting points than thermoplastics
Thermosets are always softer than thermoplastics
Thermoplastics can be remelted and reshaped; thermosets permanently harden after curing (Correct answer)

Correct answer: Thermoplastics can be remelted and reshaped; thermosets permanently harden after curing

Thermoplastics (e.g., polyethylene, nylon) soften when heated and can be remolded repeatedly; thermosets (e.g., epoxy, polyester resin) form irreversible crosslinks when cured and cannot be remelted.

Question 50: Which law states that the pressure at any point in a static fluid depends only on the depth of that point?

Torricelli's theorem
Pascal's law (Correct answer)
Bernoulli's law
Archimedes' principle

Correct answer: Pascal's law

Pascal's law states pressure applied to an enclosed fluid is transmitted equally in all directions, and static pressure depends only on fluid depth (P = ρgh).

Question 51: In ceramics, what causes brittleness compared to metals?

The dominance of ionic and covalent bonds that prevent dislocation movement (Correct answer)
The presence of glassy phases at grain boundaries
The large grain size in crystalline ceramics
The high density of grain boundaries

Correct answer: The dominance of ionic and covalent bonds that prevent dislocation movement

Ceramic brittleness arises because ionic and covalent bonds are directional and strong, preventing the dislocation slip that allows metals to deform plastically before fracturing.

Question 52: Which water treatment process removes suspended solids by allowing them to settle under gravity?

Filtration
Sedimentation (Correct answer)
Coagulation
Disinfection

Correct answer: Sedimentation

Sedimentation (clarification) allows suspended particles to settle to the bottom of a basin under gravitational force, removing them from the water.

Question 53: What does a phase diagram for a binary alloy system show?

The mechanical strength as a function of temperature
The diffusion rate of atoms in the alloy
The electrical conductivity versus composition
The equilibrium phases present at various temperatures and compositions (Correct answer)

Correct answer: The equilibrium phases present at various temperatures and compositions

A binary phase diagram maps the stable phases (solid, liquid, or mixtures) present in a two-component system across a range of temperatures and compositions.

Question 54: The electric potential difference coming from the live tissues or cells is indicated by deep-seated electrodes.

around
inside (Correct answer)
adjacent
outside

Correct answer: inside

Deep-seated electrodes are designed to measure electrical activity from structures located deep within the body. Therefore, they detect potential differences originating from *inside* the live tissues or cells, rather than on their surface or periphery. This allows for the study of internal organ function, such as brain activity using intracranial electrodes.

Question 55: In noise pollution control, what does a decibel (dB) measure?

The frequency of sound waves in hertz
The relative intensity of sound on a logarithmic scale (Correct answer)
The wavelength of a sound wave
The speed of sound in a medium

Correct answer: The relative intensity of sound on a logarithmic scale

The decibel scale expresses sound pressure level as a logarithmic ratio relative to a reference level (20 μPa), allowing the vast range of human-audible intensities to be expressed compactly.

Question 56: Acceptance sampling is a quality technique used primarily to:

Inspect every single item in a shipment to guarantee 100% conformance
Train operators to reduce defect rates through skill development
Control quality during active production by adjusting process parameters
Decide whether to accept or reject an entire lot based on inspection of a random sample (Correct answer)

Correct answer: Decide whether to accept or reject an entire lot based on inspection of a random sample

Acceptance sampling applies statistical decision rules to a random sample to accept or reject the entire lot, balancing inspection cost against the risk of accepting bad lots.

Question 57: In the context of ISO 10993, biocompatibility testing of a medical device evaluates the material's potential to cause:

Only mechanical failure under physiological loading conditions
Dimensional changes due to thermal expansion during sterilization
Electromagnetic interference with other medical devices
Adverse biological responses including cytotoxicity, sensitization, and genotoxicity (Correct answer)

Correct answer: Adverse biological responses including cytotoxicity, sensitization, and genotoxicity

ISO 10993 is a series of standards that defines biological evaluation tests—such as cytotoxicity, sensitization, irritation, systemic toxicity, and genotoxicity—to assess if a medical device or its materials could harm patients.

Question 58: Which material property is most critical when selecting a polymer for a long-term implantable cardiovascular device?

Low modulus of elasticity matching cortical bone
Biostability and resistance to degradation in vivo (Correct answer)
High degree of biodegradability
High water absorption rate

Correct answer: Biostability and resistance to degradation in vivo

Long-term cardiovascular implants require materials that are biostable—resistant to hydrolysis, oxidation, and enzymatic degradation—to maintain mechanical integrity over years of use.

Question 59: What is the purpose of a Bourdon tube in engineering instruments?

To measure temperature
To measure viscosity
To measure fluid flow rate
To measure fluid pressure (Correct answer)

Correct answer: To measure fluid pressure

A Bourdon tube is a curved metallic tube that straightens under internal pressure, with its deflection used to measure gauge pressure in fluid systems.

Question 60: What is the purpose of a sacrificial anode in cathodic protection?

To increase the pH around the metal surface
To apply an external current to stop corrosion
To coat the metal surface with an inert layer
To corrode preferentially in place of the protected metal structure (Correct answer)

Correct answer: To corrode preferentially in place of the protected metal structure

A sacrificial anode (e.g., zinc or magnesium) is more anodic than the protected structure; it corrodes instead, supplying electrons that make the structure cathodic and immune to corrosion.

Question 61: Which US regulation governs the storage, treatment, and disposal of hazardous wastes?

Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA)
Toxic Substances Control Act (TSCA)
Resource Conservation and Recovery Act (RCRA) (Correct answer)
Clean Air Act (CAA)

Correct answer: Resource Conservation and Recovery Act (RCRA)

RCRA (1976) establishes a cradle-to-grave regulatory framework for hazardous waste, covering generation, transportation, treatment, storage, and disposal.

Question 62: In surveying, the term 'benchmark' refers to:

The midpoint of a survey traverse
A horizontal control point with known coordinates
A standard performance measure for instruments
A reference point of known elevation used in leveling surveys (Correct answer)

Correct answer: A reference point of known elevation used in leveling surveys

A benchmark is a fixed reference point with a precisely known elevation used as a starting datum for differential leveling surveys.

Question 63: What does the bandwidth of an amplifier represent?

The input impedance range
The total harmonic distortion range
The range of frequencies over which gain is within 3 dB of its midband value (Correct answer)
The maximum output voltage swing

Correct answer: The range of frequencies over which gain is within 3 dB of its midband value

Bandwidth is defined as the frequency range between the lower and upper -3 dB (half-power) points of an amplifier's frequency response.

Question 64: In absorption operations, which property of the solvent is most critical for effective gas separation?

High selectivity and solubility for the target gas (Correct answer)
High viscosity to retain gas bubbles
Low density to maximize buoyancy
High volatility to recycle easily

Correct answer: High selectivity and solubility for the target gas

An effective absorption solvent must have high selectivity and solubility for the target component to achieve efficient separation.

Question 65: The power factor of a purely resistive AC circuit is:

Infinity
0.5
0
1 (Correct answer)

Correct answer: 1

A purely resistive circuit has a power factor of 1 because voltage and current are in phase, so all power is real power.

Question 66: What does the second law of thermodynamics imply about the entropy of an isolated system?

Entropy remains exactly constant
Entropy always decreases
Entropy always increases or remains constant (Correct answer)
Entropy is undefined for isolated systems

Correct answer: Entropy always increases or remains constant

The Second Law states that the entropy of an isolated system tends to increase over time, indicating the direction of spontaneous processes.

Question 67: The Economic Order Quantity (EOQ) model determines the optimal order quantity by minimizing the total of which two costs?

Labor cost and overhead cost
Production cost and transportation cost
Ordering (setup) cost and inventory holding (carrying) cost (Correct answer)
Material purchase cost and quality inspection cost

Correct answer: Ordering (setup) cost and inventory holding (carrying) cost

EOQ balances ordering/setup costs (which decrease with larger orders) against inventory holding costs (which increase with larger orders) to find the cost-minimizing quantity.

Question 68: What is the purpose of anodizing aluminum?

To apply a paint coating for aesthetics
To remove surface impurities by electrochemical etching
To grow a thick, hard oxide layer on the surface for improved corrosion and wear resistance (Correct answer)
To heat treat the aluminum to increase ductility

Correct answer: To grow a thick, hard oxide layer on the surface for improved corrosion and wear resistance

Anodizing electrochemically grows a controlled, thick aluminum oxide (Al₂O₃) layer on the aluminum surface, greatly improving corrosion resistance, hardness, and the ability to absorb dye.

Question 69: What does PID stand for in control systems?

Proportional-Inductive-Digital
Phase-Impedance-Damping
Proportional-Integral-Derivative (Correct answer)
Power-Input-Driver

Correct answer: Proportional-Integral-Derivative

A PID controller combines proportional, integral, and derivative terms to minimize error and achieve stable, accurate control of a system.

Question 70: EKG is short for

Electromyography
Electroencephalography
Electrtokinetcography
Electrocardiography (Correct answer)

Correct answer: Electrocardiography

EKG is a widely recognized abbreviation for Electrocardiography. This medical technique involves recording the electrical activity of the heart over a period of time using electrodes placed on the skin. The resulting graph, an electrocardiogram, provides valuable information about the heart's rhythm and electrical conduction system, aiding in the diagnosis of various cardiac conditions.

Question 71: Which orbital element defines the tilt of an orbit's plane relative to Earth's equatorial plane?

Argument of perigee
Right ascension of the ascending node
Inclination (Correct answer)
Eccentricity

Correct answer: Inclination

Inclination (i) is the angle between the orbital plane and the equatorial plane, ranging from 0° (equatorial) to 180° (retrograde).

Question 72: What is the SI unit of electric charge?

Volt
Farad
Ampere
Coulomb (Correct answer)

Correct answer: Coulomb

The coulomb (C) is the SI unit of electric charge, equal to the charge transported by a current of one ampere in one second.

Question 73: What is the primary purpose of a heat exchanger's LMTD (Log Mean Temperature Difference)?

To estimate fouling resistance
To determine the average driving force for heat transfer (Correct answer)
To find the shell-side velocity
To calculate the pressure drop across the exchanger

Correct answer: To determine the average driving force for heat transfer

LMTD represents the effective average temperature difference driving heat transfer between the two fluid streams.

Question 74: According to ASTM D1143, the standard load test for deep foundations is the:

Static axial compressive load test on piles (Correct answer)
Plate load test
Cone penetration test (CPT)
Standard penetration test (SPT)

Correct answer: Static axial compressive load test on piles

ASTM D1143 specifies procedures for static axial compressive load testing to determine pile capacity and load-settlement behavior.

Question 75: What is the primary purpose of a snubber circuit in power electronics?

To increase switching frequency
To filter the DC bus
To boost output power
To limit voltage and current transients across switching devices (Correct answer)

Correct answer: To limit voltage and current transients across switching devices

Snubber circuits suppress voltage spikes and reduce dv/dt across power switches like IGBTs and thyristors, protecting them from damage.

Question 76: What is the function of a Phase-Locked Loop (PLL) in communication systems?

To filter out noise from the carrier
To synchronize an output signal's phase with a reference input signal (Correct answer)
To convert analog signals to digital
To amplify weak signals

Correct answer: To synchronize an output signal's phase with a reference input signal

A PLL locks its output oscillator's phase and frequency to match a reference signal, used in clock recovery, frequency synthesis, and demodulation.

Question 77: In embedded systems, what is a real-time operating system (RTOS) designed to guarantee?

Maximum processing throughput regardless of timing
That tasks are completed within defined time deadlines (Correct answer)
The highest possible clock frequency
Unlimited memory allocation for all tasks

Correct answer: That tasks are completed within defined time deadlines

An RTOS provides deterministic scheduling to ensure critical tasks meet strict timing deadlines, essential for safety-critical applications like automotive and medical devices.

Question 78: What is Biochemical Oxygen Demand (BOD) a measure of?

The amount of oxygen microorganisms need to decompose organic matter in water (Correct answer)
The concentration of dissolved oxygen in water
The total nitrogen content of wastewater
The pH level of industrial effluent

Correct answer: The amount of oxygen microorganisms need to decompose organic matter in water

BOD measures the quantity of oxygen consumed by biological processes breaking down organic material in water at a given temperature over a set time period (typically 5 days at 20°C).

Question 79: In a DC circuit, three resistors of 6 Ω, 3 Ω, and 2 Ω are connected in parallel. What is the equivalent resistance?

1 Ω (Correct answer)
3 Ω
11 Ω
0.5 Ω

Correct answer: 1 Ω

1/R_eq = 1/6 + 1/3 + 1/2 = 1/6 + 2/6 + 3/6 = 6/6 = 1, so R_eq = 1 Ω.

Question 80: What is the function of a cyclone separator in industrial air pollution control?

To burn combustible pollutants at high temperature
To use centrifugal force to separate particles from a gas stream (Correct answer)
To absorb gaseous pollutants in a liquid scrubber
To filter gases through activated carbon

Correct answer: To use centrifugal force to separate particles from a gas stream

A cyclone separator spins the gas stream, creating centrifugal force that drives heavier particles to the wall and down into a collection hopper, separating them from the cleaned gas.

Question 81: What does the term 'eutrophication' describe in aquatic environments?

Saltwater intrusion into freshwater bodies
The natural aging and infilling of a water body
Excessive nutrient enrichment causing algal blooms and oxygen depletion (Correct answer)
Acidification of a lake due to acid rain

Correct answer: Excessive nutrient enrichment causing algal blooms and oxygen depletion

Eutrophication occurs when excess nutrients (nitrogen, phosphorus) from agricultural runoff or sewage stimulate excessive algal growth, leading to oxygen depletion and ecosystem damage when algae decompose.

Question 82: In control systems, the steady-state error for a unit ramp input applied to a Type-1 system equals:

Infinity
Zero
1/Ka
1/Kv (Correct answer)

Correct answer: 1/Kv

A Type-1 system has one integrator; its steady-state ramp error is 1/Kv where Kv is the velocity error constant.

Question 83: What is the purpose of alloying in metals?

To eliminate electrical conductivity
To reduce the melting point to near room temperature
To make metals transparent
To improve mechanical properties such as strength, hardness, or corrosion resistance (Correct answer)

Correct answer: To improve mechanical properties such as strength, hardness, or corrosion resistance

Alloying adds one or more elements to a base metal to alter its microstructure and enhance properties like strength, ductility, toughness, or corrosion resistance.

Question 84: What is the mechanism of corrosion in metals involving an electrochemical reaction?

A direct chemical reaction between the metal and oxygen only
A physical erosion of the metal surface by fluid flow
A thermal decomposition of the metal's crystal lattice
An oxidation reaction at the anode and a reduction reaction at the cathode in the presence of an electrolyte (Correct answer)

Correct answer: An oxidation reaction at the anode and a reduction reaction at the cathode in the presence of an electrolyte

Electrochemical corrosion occurs when a galvanic cell forms: the anodic metal oxidizes (loses electrons) while cathodic reduction occurs at another site, with ions transported through the electrolyte.

Question 85: What distinguishes amorphous materials from crystalline materials?

Amorphous materials conduct electricity better
Amorphous materials lack long-range atomic order; crystalline materials have periodic atomic arrangement (Correct answer)
Amorphous materials are always harder than crystalline ones
Crystalline materials have lower melting points

Correct answer: Amorphous materials lack long-range atomic order; crystalline materials have periodic atomic arrangement

Crystalline materials (e.g., metals, most ceramics) have atoms arranged in a repeating lattice structure, while amorphous materials (e.g., glass, most polymers) have random, disordered atomic arrangement.

Question 86: In soil remediation, what does 'pump and treat' refer to?

Physically excavating and removing contaminated soil
Extracting contaminated groundwater, treating it above ground, and reinjecting or disposing of it (Correct answer)
Adding nutrients to stimulate microbial degradation
Injecting steam into soil to volatilize contaminants

Correct answer: Extracting contaminated groundwater, treating it above ground, and reinjecting or disposing of it

Pump-and-treat extracts contaminated groundwater via wells, treats it using activated carbon, air stripping, or other methods above ground, then discharges or reinjects the clean water.

Question 87: In a pressure vessel, hoop (circumferential) stress for a thin-walled cylinder under internal pressure p with radius r and wall thickness t is:

pr/t (Correct answer)
pt/r
pr/2t
2pr/t

Correct answer: pr/t

Hoop stress in a thin-walled cylinder is σ_θ = pr/t, which is twice the longitudinal stress and governs the design against bursting.

Question 88: In a CSTR (Continuous Stirred Tank Reactor) at steady state, which assumption is always made?

Temperature varies along the reactor length
Plug flow with no axial mixing
Reactant conversion is always higher than in a PFR
Concentration is uniform throughout the reactor volume (Correct answer)

Correct answer: Concentration is uniform throughout the reactor volume

A CSTR assumes perfect mixing, so the concentration and temperature inside are uniform and equal to the exit stream values.

Question 89: What is the function of a DMA (Direct Memory Access) controller?

To compress data stored in RAM
To synchronize CPU clock with memory clock
To transfer data between memory and peripherals without continuous CPU involvement (Correct answer)
To protect memory from unauthorized access

Correct answer: To transfer data between memory and peripherals without continuous CPU involvement

A DMA controller handles bulk data transfers between peripherals (e.g., disk, network) and memory directly, freeing the CPU for other tasks during the transfer.

Question 90: In digital circuits, what is the purpose of a flip-flop?

To store one bit of data (Correct answer)
To amplify digital signals
To convert serial to parallel data
To generate clock signals

Correct answer: To store one bit of data

A flip-flop is a bistable memory element that stores a single binary bit and changes state based on clock and input signals.

Question 91: What is the primary health risk associated with lead contamination in drinking water?

Skin cancer
Liver failure in adults
Neurological damage, especially in children (Correct answer)
Respiratory disease

Correct answer: Neurological damage, especially in children

Lead is a potent neurotoxin; even low-level exposure causes irreversible cognitive and behavioral damage in children, affecting IQ, attention, and academic performance.

Question 92: What is the purpose of chlorination in drinking water treatment?

To adjust the pH of the water
To disinfect water by killing pathogens such as bacteria and viruses (Correct answer)
To remove dissolved minerals and hardness
To reduce turbidity and suspended solids

Correct answer: To disinfect water by killing pathogens such as bacteria and viruses

Chlorination adds chlorine to water to destroy harmful microorganisms including bacteria, viruses, and protozoa, making the water safe for human consumption.

Question 93: What is the difference between RISC and CISC processor architectures?

RISC uses simple, fixed-length instructions executed in one cycle; CISC uses complex, variable-length instructions (Correct answer)
CISC processors are always faster than RISC
RISC uses more transistors than CISC
RISC and CISC refer to memory types, not processor design

Correct answer: RISC uses simple, fixed-length instructions executed in one cycle; CISC uses complex, variable-length instructions

RISC (Reduced Instruction Set Computer) processors use a small set of simple, fixed-format instructions for fast execution, while CISC (Complex Instruction Set Computer) processors use many complex, variable-length instructions.

Question 94: Which structural analysis method satisfies both equilibrium and compatibility conditions?

Finite element method (Correct answer)
Method of sections
Graphical statics
Force method

Correct answer: Finite element method

The finite element method satisfies both equilibrium (force balance) and compatibility (displacement continuity) through variational formulations.

Question 95: What is the purpose of a flyback diode in a DC motor circuit?

To filter AC ripple
To increase motor speed
To regulate supply voltage
To protect against voltage spikes when the motor turns off (Correct answer)

Correct answer: To protect against voltage spikes when the motor turns off

A flyback (freewheeling) diode clamps the voltage spike generated by the motor's inductance when current is suddenly interrupted, protecting circuit components.

Question 96: In networking, what does the OSI model's Transport Layer (Layer 4) primarily provide?

Formatting data for application use
Physical transmission of raw bits over a medium
End-to-end communication, flow control, and error recovery between hosts (Correct answer)
Routing packets between networks

Correct answer: End-to-end communication, flow control, and error recovery between hosts

Layer 4 (Transport) provides reliable end-to-end data transfer with services like segmentation, flow control, and error recovery; TCP and UDP operate at this layer.

Question 97: Which method is used to determine the California Bearing Ratio (CBR) of a subgrade soil?

Triaxial compression test
Plate load test at the ground surface
A penetration test comparing resistance to that of crushed limestone (Correct answer)
Standard Proctor compaction test

Correct answer: A penetration test comparing resistance to that of crushed limestone

CBR is determined by measuring the load required to penetrate a soil sample at specified rates compared to standard crushed limestone values.

Question 98: The chimney's smoke particles fall within the category of .

Streakline (Correct answer)
Position vector
Path line
Streamline

Correct answer: Streakline

A streakline is defined as the locus of all fluid particles that have passed through a specific fixed point in space at successive instants of time. The smoke particles emanating from a chimney perfectly illustrate a streakline, as they are continuously released from a single point (the chimney exit) and then carried downstream, forming a visible trail that represents the history of particles passing through that point.

Question 99: What is the purpose of a landfill liner in solid waste management?

To reduce the volume of waste
To prevent leachate from contaminating underlying soil and groundwater (Correct answer)
To accelerate decomposition of waste
To capture methane gas for energy recovery

Correct answer: To prevent leachate from contaminating underlying soil and groundwater

Landfill liners (typically HDPE geomembrane and compacted clay) create an impermeable barrier that prevents toxic leachate from migrating into groundwater.

Question 100: The Mohr-Coulomb failure criterion for soil defines shear strength as:

τ = E × γ
τ = c × N_c + q × N_q
τ = c + σ tan φ (Correct answer)
τ = σ_1 – σ_3

Correct answer: τ = c + σ tan φ

Shear strength equals cohesion (c) plus normal stress (σ) multiplied by the tangent of the internal friction angle (φ).

Question 101: What is the ozone layer's role in protecting Earth?

To prevent cosmic ray bombardment
To absorb harmful ultraviolet (UV) radiation from the Sun (Correct answer)
To regulate global temperature by trapping infrared radiation
To supply oxygen for breathing at high altitudes

Correct answer: To absorb harmful ultraviolet (UV) radiation from the Sun

The stratospheric ozone layer (O₃) absorbs 97–99% of the Sun's harmful UV-B and UV-C radiation, preventing it from reaching Earth's surface and causing skin cancer and ecosystem damage.

Question 102: In a binary liquid-vapor system, what is an azeotrope?

A mixture whose vapor composition equals its liquid composition at a given T and P (Correct answer)
A mixture where both components are completely immiscible
The composition at maximum boiling point for any binary system
A mixture that cannot be distilled under any conditions

Correct answer: A mixture whose vapor composition equals its liquid composition at a given T and P

An azeotrope is a mixture where the vapor and liquid have identical compositions, making separation by ordinary distillation impossible.

Question 103: The continuity equation has a connection to .

Momentum conservation
Energy conservation
Velocity change
Mass conservation (Correct answer)

Correct answer: Mass conservation

The continuity equation is a fundamental principle in fluid dynamics that expresses the conservation of mass. It states that for a steady flow, the mass flow rate entering a control volume must equal the mass flow rate leaving it, or more generally, the rate of change of mass within a control volume is equal to the net mass flow rate across its boundaries. This principle ensures that mass is neither created nor destroyed within the system.

Question 104: Which of the following best describes an op-amp in an inverting configuration?

The gain is always unity
The output is 180 degrees out of phase with the input (Correct answer)
The output equals the input voltage
The input impedance is zero

Correct answer: The output is 180 degrees out of phase with the input

In an inverting op-amp configuration, the output signal is amplified and phase-shifted by 180 degrees relative to the input signal.

Question 105: What is the Manning's equation used for in hydraulics?

Estimating flow velocity in open channels (Correct answer)
Determining pipe diameter for pressure flow
Calculating sediment transport capacity
Computing hydrostatic pressure at depth

Correct answer: Estimating flow velocity in open channels

Manning's equation relates open-channel flow velocity to channel geometry, slope, and roughness coefficient (n).

Question 106: What is the primary purpose of activated sludge in wastewater treatment?

To filter suspended solids through a membrane
To neutralize acidic wastewater
To chemically precipitate heavy metals
To use microorganisms to biologically degrade dissolved organic matter (Correct answer)

Correct answer: To use microorganisms to biologically degrade dissolved organic matter

The activated sludge process introduces air into wastewater mixed with a dense microbial community, enabling aerobic bacteria to metabolize and remove dissolved organic pollutants.

Question 107: Which feed type kiln does not have fuel contact with limestone?

Separate feed (Correct answer)
Mixed feed
Isolated feed
Single feed

Correct answer: Separate feed

In a separate feed kiln, the fuel and the limestone are introduced into the kiln through different channels, ensuring they do not come into direct contact during the calcination process. This design prevents contamination of the quicklime with ash or unburnt fuel particles, resulting in a purer product. This contrasts with mixed feed kilns where fuel and limestone are charged together, allowing for direct contact.

Question 108: What is the family of circles with a single diameter differential equation's order along the y=x axis?

The Doppler Effect
Electromagnetic law (Correct answer)
Newton’s law of gravitation
Lenz’s law

Correct answer: Electromagnetic law

According to this theory, every body in the universe is drawn to every other body with a force that is inversely proportional to the square of the distance between them and directly proportional to the product of their masses. It therefore applies to all natural processes.

Question 109: In air pollution control, what does a baghouse filter remove from industrial exhaust?

Sulfur dioxide gas
Carbon monoxide
Particulate matter (dust and fine particles) (Correct answer)
Volatile organic compounds

Correct answer: Particulate matter (dust and fine particles)

A baghouse uses fabric filter bags to capture particulate matter from industrial exhaust gas streams, achieving high collection efficiencies for fine particles.

Question 110: In electrical machines, what is slip in an induction motor?

The phase difference between stator currents
The voltage drop across the stator resistance
The mechanical power lost to friction
The difference between synchronous speed and rotor speed, expressed as a fraction of synchronous speed (Correct answer)

Correct answer: The difference between synchronous speed and rotor speed, expressed as a fraction of synchronous speed

Slip (s) = (Ns - Nr) / Ns, where Ns is synchronous speed and Nr is rotor speed; it quantifies how much the rotor lags behind the rotating magnetic field.

Question 111: The process capability index Cp is calculated using which formula?

(USL − LSL) / 6σ (Correct answer)
(USL + LSL) / (2 × Mean)
(USL − Mean) / 3σ
(Mean − LSL) / 3σ

Correct answer: (USL − LSL) / 6σ

Cp = (USL − LSL) / 6σ compares the width of the specification (tolerance) range to the natural spread of the process (6 standard deviations), regardless of process centering.

Question 112: In the US, which federal law primarily regulates the discharge of pollutants into navigable waters?

Safe Drinking Water Act (SDWA)
Clean Air Act (CAA)
Clean Water Act (CWA) (Correct answer)
Resource Conservation and Recovery Act (RCRA)

Correct answer: Clean Water Act (CWA)

The Clean Water Act (1972) establishes the framework for regulating pollutant discharges into US waters and sets water quality standards for surface waters.

Fundamentals of Engineering (FE) — Bachelor of Engineering

The NCEES Fundamentals of Engineering (FE) exam is the first step toward professional engineering (PE) licensure for BE/B.Eng graduates, testing core engineering principles across disciplines including electrical, environmental, materials, and chemical engineering.

110

Questions

320 min

Time Limit

70%

To Pass

Checking for saved progress...

Exam Rules

You can skip questions and return to them later
Flag questions for review before submitting
No feedback shown until you submit the entire exam
Unanswered questions count as wrong — answer everything
10 pretest questions are mixed in and don't affect your score
Timer auto-submits when time runs out
Your progress is auto-saved every 30 seconds