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

Question 1: Which of the following best describes an op-amp in an inverting configuration?

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

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

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

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 3: Which signal type has a continuous range of values and is defined at every instant in time?

Analog signal (Correct answer)
Discrete-time signal
Quantized signal
Digital signal

Correct answer: Analog signal

An analog signal is continuous in both time and amplitude, whereas digital signals are discrete in both dimensions.

Question 4: 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 5: What is the mechanism of corrosion in metals involving an electrochemical reaction?

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

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 6: What is the significance of the Damköhler number (Da) in reactor design?

Ratio of reaction rate to convective mass transport rate (Correct answer)
Ratio of turbulent to molecular diffusivity
Ratio of pressure drop to flow velocity
Ratio of heat generation to heat removal

Correct answer: Ratio of reaction rate to convective mass transport rate

The Damköhler number compares the characteristic reaction rate to the convective flow rate, indicating whether reaction or transport limits conversion.

Question 7: What is the Hall-Petch relationship in materials science?

Hardness decreases with increasing grain boundary area
Fatigue life is inversely proportional to grain size
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 8: 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 9: What is the primary health risk associated with lead contamination in drinking water?

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

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 10: In gear systems, the gear ratio is defined as the ratio of the number of teeth on the:

Driving gear to the driven gear
Output shaft speed to input shaft speed
Driven gear to the driving gear (Correct answer)
Smallest gear to the largest gear

Correct answer: Driven gear to the driving gear

Gear ratio = teeth on driven gear / teeth on driving gear, and inversely equals the input-to-output speed ratio for a simple gear pair.

Question 11: Which of the following describes the luminous intensity in SI units?

Sterdian
Mole
Radian
Candela (Correct answer)

Correct answer: Candela

The SI unit for light intensity is the candela. One candela is the amount of light emitted in a particular direction by a source with a radiant intensity of 1/683 watt per sterdian and a monochromatic emission frequency of 540x1012 hertz.

Question 12: What is the function of a Phase-Locked Loop (PLL) in communication systems?

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

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 13: Fouling in heat exchangers primarily results in which operational consequence?

Reduced pressure drop across tubes
Increased heat transfer coefficient
Lower fluid viscosity on the shell side
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 14: In tissue engineering, what is the function of a scaffold?

To provide a three-dimensional structure that supports cell attachment and tissue formation (Correct answer)
To directly replace the extracellular matrix with a permanent synthetic structure
To serve as a genetic delivery vehicle for CRISPR-Cas9 editing
To act as the primary source of growth factors secreted into the bloodstream

Correct answer: To provide a three-dimensional structure that supports cell attachment and tissue formation

A scaffold provides a temporary three-dimensional framework that mimics the extracellular matrix, enabling cells to attach, proliferate, and organize into functional tissue.

Question 15: 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 16: In fatigue analysis of aerospace structures, what does the stress ratio R represent?

Ratio of cyclic amplitude to mean stress
Ratio of maximum stress to ultimate tensile strength
Ratio of fatigue limit to yield stress
Ratio of minimum stress to maximum stress in a cycle (Correct answer)

Correct answer: Ratio of minimum stress to maximum stress in a cycle

R = σ_min/σ_max defines the loading character: R = -1 is fully reversed, R = 0 is pulsating tension, and R = 1 is static.

Question 17: What does the term 'eutrophication' describe in aquatic environments?

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

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 18: Which separation technique exploits differences in molecular size by using a semipermeable membrane?

Adsorption on activated carbon
Liquid-liquid extraction
Membrane filtration (ultrafiltration/reverse osmosis) (Correct answer)
Azeotropic distillation

Correct answer: Membrane filtration (ultrafiltration/reverse osmosis)

Membrane filtration processes such as reverse osmosis and ultrafiltration separate species based on molecular size using semipermeable membranes.

Question 19: 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 20: Why is high pressure oxygen required by the bomb calorimeter?

To increase the kinetic energy
To increase the ignition temperature
To increase the rate of reaction
To ensure that the given sample in the crucible burns completely (Correct answer)

Correct answer: To ensure that the given sample in the crucible burns completely

This entire procedure should be performed at a pressure of 30 bar. The oxygen aids in the coal sample's burning.

Question 21: 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 22: Which of the following is not a gadget that measures pressure?

None of the mentioned
Galvanometer (Correct answer)
Barometer
Manometer

Correct answer: Galvanometer

A manometer and a barometer are both instruments specifically designed to measure pressure. A manometer typically measures fluid pressure differences, while a barometer measures atmospheric pressure. A galvanometer, however, is an electromechanical instrument used for detecting and measuring electric current, not pressure.

Question 23: Ohm's Law states that voltage equals current multiplied by which quantity?

Impedance
Capacitance
Inductance
Resistance (Correct answer)

Correct answer: Resistance

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

Question 24: What is the purpose of alloying in metals?

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

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

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

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

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

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

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

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 28: In tribology, what is the Stribeck curve used for?

To characterize lubrication regimes as a function of speed, load, and viscosity (Correct answer)
To relate friction coefficient to temperature
To measure wear rate versus hardness
To plot fatigue life against contact pressure

Correct answer: To characterize lubrication regimes as a function of speed, load, and viscosity

The Stribeck curve plots friction coefficient against the Hersey number (μN/P), defining boundary, mixed, and hydrodynamic lubrication regimes for sliding contacts.

Question 29: Which welding defect is most commonly detected using radiographic (X-ray) testing?

Surface cracks
Undercut at the weld toe
Internal porosity and inclusions (Correct answer)
Distortion of the base metal

Correct answer: Internal porosity and inclusions

Radiographic testing excels at detecting internal volumetric defects such as porosity, slag inclusions, and incomplete fusion within the weld.

Question 30: What is the primary purpose of activated sludge in wastewater treatment?

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

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

Schottky diode
PIN diode
Zener diode (Correct answer)
Tunnel 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 32: In surveying, the term 'benchmark' refers to:

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

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

To filter gases through activated carbon
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

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 34: What is the role of flutter analysis in aircraft structural design?

To compute fatigue life under gust loading
To identify the critical airspeed at which aeroelastic oscillations become self-sustaining (Correct answer)
To assess panel buckling under aerodynamic pressure
To optimize wing twist for minimum induced drag

Correct answer: To identify the critical airspeed at which aeroelastic oscillations become self-sustaining

Flutter is a dynamic aeroelastic instability where structural and aerodynamic forces couple to produce diverging oscillations; the flutter speed must exceed the aircraft's maximum operating speed with margin.

Question 35: Which equation describes the pressure drop for incompressible fluid flow through a pipe?

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

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 36: In a neural prosthetic system, what is 'spike sorting'?

Filtering the raw neural signal to remove low-frequency local field potentials
Compressing neural data for wireless transmission using entropy coding
The process of classifying recorded voltage waveforms to identify action potentials from individual neurons (Correct answer)
Calibrating electrode impedance to minimize charge injection artifacts

Correct answer: The process of classifying recorded voltage waveforms to identify action potentials from individual neurons

Spike sorting is a signal-processing step that identifies and classifies action potential waveforms recorded on an electrode to attribute them to individual neurons based on waveform shape and amplitude.

Question 37: Which structural analysis method satisfies both equilibrium and compatibility conditions?

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

Correct answer: Finite element method

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

Question 38: What is the primary advantage of using hydroxyapatite (HA) as a coating on orthopedic implants?

It acts as an antibiotic carrier to prevent peri-implant infection
It increases the electrical conductivity of the implant to stimulate bone growth electrically
It provides a lubricious surface that reduces friction at articulating interfaces
Its chemical similarity to bone mineral promotes osseointegration and bone bonding (Correct answer)

Correct answer: Its chemical similarity to bone mineral promotes osseointegration and bone bonding

Hydroxyapatite is chemically and structurally similar to the mineral phase of bone, and its use as a coating promotes direct bone apposition and biological fixation (osseointegration) without fibrous tissue interposition.

Question 39: Which of the following requires the most analysis?

solid
fluids (Correct answer)
plasma
cannot be determined

Correct answer: fluids

Fluids, encompassing both liquids and gases, exhibit complex behaviors such as turbulence, viscosity, and compressibility, which require sophisticated mathematical models and experimental techniques for accurate analysis. Unlike solids with fixed structures, fluids continuously deform under stress, making their motion and interaction with boundaries highly intricate. This inherent complexity makes fluid mechanics one of the most challenging and extensively studied areas in engineering.

Question 40: Which modulation technique is used in WiFi (IEEE 802.11) for high-data-rate transmission?

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

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 41: What is the function of a check valve in a hydraulic system?

To reduce pressure surges
To filter contaminants
To regulate flow rate
To allow flow in only one direction (Correct answer)

Correct answer: To allow flow in only one direction

A check valve (non-return valve) permits fluid flow in one direction only and automatically prevents backflow when downstream pressure exceeds upstream pressure.

Question 42: What is the purpose of age hardening (precipitation hardening) in aluminum alloys?

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

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 43: Which heat transfer mechanism does not require a medium and can occur in a vacuum?

Conduction
Convection
Advection
Radiation (Correct answer)

Correct answer: Radiation

Thermal radiation transfers energy via electromagnetic waves and requires no medium, making it the only mode that works through a vacuum.

Question 44: What is the purpose of a sacrificial anode in cathodic protection?

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

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 45: What does the bandwidth of an amplifier represent?

The range of frequencies over which gain is within 3 dB of its midband value (Correct answer)
The total harmonic distortion range
The input impedance range
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 46: What is the primary greenhouse gas produced by human activities contributing to climate change?

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

Correct answer: Carbon dioxide (CO₂)

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

Question 47: What is the Vickers Hardness Test used to measure?

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

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 48: What distinguishes amorphous materials from crystalline materials?

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
Amorphous materials conduct electricity better

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 49: The calculation of kinetic energy is as follows:

KE = 0.5*m*v
KE = m*v²
KE = 0.6*m*v²
KE = 0.5*m*v² (Correct answer)

Correct answer: KE = 0.5*m*v²

Kinetic energy is the energy an object possesses due to its motion. The standard formula for calculating kinetic energy is KE = 0.5 * m * v², where 'm' represents the mass of the object and 'v' represents its velocity. This equation shows that kinetic energy is directly proportional to the mass and the square of the velocity, meaning a small increase in speed results in a significant increase in kinetic energy.

Question 50: What is a shape memory alloy (SMA)?

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

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

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

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 52: In structural analysis, what is a statically determinate structure?

A structure with more supports than needed for stability
A structure that deflects negligibly under load
A structure whose reactions and internal forces can be determined using equilibrium equations alone (Correct answer)
A structure with no redundant members

Correct answer: A structure whose reactions and internal forces can be determined using equilibrium equations alone

A statically determinate structure has exactly enough supports so that all reactions and internal forces are calculable from the three equilibrium equations (ΣFx=0, ΣFy=0, ΣM=0).

Question 53: What is the purpose of chlorination in drinking water treatment?

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

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

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

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

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

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 56: In a biomedical signal, 'aliasing' occurs when the sampling frequency is:

Less than twice the highest frequency component of the signal (below Nyquist rate) (Correct answer)
Greater than twice the highest frequency component of the signal (above Nyquist rate)
Greater than the signal amplitude in volts
Equal to the frequency of the dominant signal component

Correct answer: Less than twice the highest frequency component of the signal (below Nyquist rate)

According to the Nyquist-Shannon sampling theorem, if the sampling frequency is less than twice the signal's highest frequency, high-frequency components are misrepresented as lower-frequency artifacts called aliases.

Question 57: Exactly what kind of fuel is lignite?

Secondary fuel
Gaseous fuel
Liquid fuel
Primary fuel (Correct answer)

Correct answer: Primary fuel

Since it can be taken from nature without going through any sort of modification procedure, lignite is a primary fuel. Brown, soft lignite coal. It is regarded as coal's lowest rank.

Question 58: 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 59: In the US, which federal law primarily regulates the discharge of pollutants into navigable waters?

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

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.

Question 60: What does the term 'specific excess power' (Ps) indicate in aircraft performance?

The difference between installed and uninstalled engine thrust
The excess lift over weight during a pull-up maneuver
The thrust available beyond what is needed to maintain level flight at a given airspeed
The rate at which an aircraft can simultaneously increase both speed and altitude (Correct answer)

Correct answer: The rate at which an aircraft can simultaneously increase both speed and altitude

Ps = (T-D)V/W in ft/s, representing the energy rate available to increase kinetic or potential energy, enabling simultaneous acceleration and climb.

Question 61: In a distillation column, what does the 'reflux ratio' represent?

Ratio of reboiler duty to condenser duty
Ratio of feed to bottoms flow rate
Ratio of liquid returned to distillate withdrawn (Correct answer)
Ratio of vapor to liquid on a tray

Correct answer: Ratio of liquid returned to distillate withdrawn

The reflux ratio is the ratio of liquid returned to the top of the column to the distillate product withdrawn.

Question 62: In fluid mechanics, what does the Reynolds number represent?

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

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 63: What is the purpose of anodizing aluminum?

To grow a thick, hard oxide layer on the surface for improved corrosion and wear resistance (Correct answer)
To apply a paint coating for aesthetics
To remove surface impurities by electrochemical etching
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 64: In queuing theory, Little's Law states L = λW. What does 'L' represent?

The maximum length the queue has ever reached
The average number of customers in the system (queue + service) (Correct answer)
The average time a customer spends waiting in the queue only
The server utilization rate of the system

Correct answer: The average number of customers in the system (queue + service)

Little's Law: L (average number of customers in the system) = λ (average arrival rate) × W (average time each customer spends in the system).

Question 65: What is the SI unit of electric charge?

Coulomb (Correct answer)
Volt
Ampere
Farad

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 66: Muscle palsies indicate

active muscles
paralyzed muscles (Correct answer)
voluntary muscles
involuntary muscles

Correct answer: paralyzed muscles

Muscle palsies refer to a condition characterized by paralysis or significant weakness of muscles, often resulting in a loss of voluntary movement or impaired motor function. This term specifically indicates that the affected muscles are unable to function normally, distinguishing them from active, voluntary, or involuntary muscles that retain their typical capabilities. It signifies a state of impaired or lost muscle control.

Question 67: What is the difference between thermoplastic and thermoset polymers?

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

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 68: In structural steel design (AISC LRFD), the design strength is expressed as:

Ru / φ ≥ Rn
Rn × SF ≥ Ra
φRn ≥ Ru (Correct answer)
Rn / Ω ≥ Ra

Correct answer: φRn ≥ Ru

LRFD requires that the factored resistance (φRn) equals or exceeds the factored load demand (Ru), where φ is the resistance factor.

Question 69: What is Fick's First Law of diffusion in materials science?

Atoms diffuse only along grain boundaries
The diffusion rate doubles with every 10°C temperature increase
Diffusivity is independent of temperature
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 70: In the context of the Hodgkin-Huxley model, what do the variables 'm', 'h', and 'n' represent?

Maximum conductance values for sodium, potassium, and chloride
Activation and inactivation gating variables for Na⁺ channels and activation gating for K⁺ channels (Correct answer)
Myelination factor, saltatory conduction velocity, and node density
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 71: Which logic gate produces a HIGH output only when all inputs are HIGH?

AND (Correct answer)
OR
NAND
XOR

Correct answer: AND

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

Question 72: What is the ozone layer's role in protecting Earth?

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

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 73: According to the AASHTO classification system, a soil classified as A-7 is best described as:

Silty sand with good drainage
Well-graded gravel
Sandy soil with low plasticity
Highly plastic clay — poor subgrade material (Correct answer)

Correct answer: Highly plastic clay — poor subgrade material

A-7 soils are highly plastic clays or silts considered poor subgrade materials due to high volume change with moisture.

Question 74: Which renewable energy source generates electricity by harnessing the kinetic energy of wind?

Solar photovoltaic panel
Geothermal plant
Hydroelectric dam
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 75: Which property of a fluid determines whether it obeys Newton's law of viscosity?

Linearity between shear stress and shear rate (Newtonian behavior) (Correct answer)
Compressibility
Thermal conductivity
Surface tension

Correct answer: Linearity between shear stress and shear rate (Newtonian behavior)

A Newtonian fluid exhibits a linear relationship between shear stress and shear rate, with the proportionality constant being the dynamic viscosity.

Question 76: In noise pollution control, what does a decibel (dB) measure?

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

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 77: What is a composite material?

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

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 78: What does the Laplace transform of a unit impulse function δ(t) equal?

1/s
s
1 (Correct answer)
0

Correct answer: 1

The Laplace transform of the Dirac delta function δ(t) is 1, making it useful as a test input in control system analysis.

Question 79: In a binary liquid-vapor system, what is an azeotrope?

A mixture that cannot be distilled under any conditions
The composition at maximum boiling point for any binary system
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

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 80: In medical imaging, what does 'spatial resolution' refer to?

The time required to acquire a complete image frame
The range of signal intensities that an imaging system can represent
The ability of a system to detect the smallest resolvable detail or distance between two objects (Correct answer)
The ability of a system to distinguish between tissues with different densities

Correct answer: The ability of a system to detect the smallest resolvable detail or distance between two objects

Spatial resolution describes the minimum separation distance at which two distinct objects or features can be distinguished as separate entities within an image.

Question 81: What does a phase diagram for a binary alloy system show?

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

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 82: In computer networks, what is the purpose of subnetting?

To increase the total number of available IP addresses
To divide a large network into smaller, more manageable sub-networks (Correct answer)
To encrypt data transmitted across a network
To connect two different network protocols

Correct answer: To divide a large network into smaller, more manageable sub-networks

Subnetting partitions an IP network into smaller logical sub-networks to improve performance, security, and IP address management efficiency.

Question 83: The power factor of a purely resistive AC circuit is:

Infinity
0
1 (Correct answer)
0.5

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 84: Pure limestone is calcined to produce a substance known as:

Rich Lime
Quick Lime (Correct answer)
Lean Lime
Pure Lime

Correct answer: Quick Lime

Calcination is the process of heating pure limestone (calcium carbonate, CaCO₃) to a high temperature, typically around 900-1000°C. This thermal decomposition reaction drives off carbon dioxide (CO₂), leaving behind calcium oxide (CaO). Calcium oxide is commonly known as quicklime or unslaked lime, a highly reactive substance used in various industrial and construction applications.

Question 85: The change in electrical potential caused by a pulse traveling along a muscle cell or nerve cell's membrane is known as .

muscle potential
resting potential
action potential (Correct answer)
half cell potential

Correct answer: action potential

An action potential is a rapid, transient, and propagating change in the electrical potential across the membrane of an excitable cell, such as a nerve or muscle cell. This electrical pulse is generated when the membrane potential reaches a threshold, leading to a rapid depolarization followed by repolarization, and serves as the fundamental mechanism for transmitting information over long distances in the nervous system and initiating muscle contraction.

Question 86: What is the purpose of a flyback diode in a DC motor circuit?

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

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 87: In wastewater treatment, the Biochemical Oxygen Demand (BOD) test measures:

The oxygen consumed by microorganisms decomposing organic matter over 5 days at 20°C (Correct answer)
The total dissolved solids in effluent
The chlorine dose needed for disinfection
The chemical oxygen required to oxidize all organics

Correct answer: The oxygen consumed by microorganisms decomposing organic matter over 5 days at 20°C

BOD5 quantifies the amount of dissolved oxygen consumed by biological degradation of organic pollutants at 20°C over five days.

Question 88: What is the purpose of a landfill liner in solid waste management?

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

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

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

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

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

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 91: In the simplex method for linear programming, the optimal solution always occurs at which location in the feasible region?

At the origin of the coordinate system
At the centroid (geometric center) of the feasible region
At a corner point (extreme point/vertex) of the feasible region (Correct answer)
Along the boundary edge connecting two constraint lines

Correct answer: At a corner point (extreme point/vertex) of the feasible region

The fundamental theorem of linear programming guarantees that if an optimal solution exists, it occurs at a corner (vertex) of the convex feasible polyhedron.

Question 92: Which dimensionless number represents the ratio of momentum diffusivity to thermal diffusivity in a fluid?

Schmidt number
Prandtl number (Correct answer)
Biot number
Nusselt number

Correct answer: Prandtl number

The Prandtl number (Pr = μcₚ/k = ν/α) is the ratio of kinematic viscosity (momentum diffusivity) to thermal diffusivity.

Question 93: What does PID stand for in control systems?

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

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

To implement mitigation measures
To identify the significant issues and potential impacts that should be studied in detail (Correct answer)
To obtain permits from regulatory agencies
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 95: In digital circuits, what is the purpose of a flip-flop?

To store one bit of data (Correct answer)
To convert serial to parallel data
To generate clock signals
To amplify digital 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 96: What is the role of a compiler in software development?

To execute programs line by line at runtime
To manage memory allocation during program execution
To debug and test source code automatically
To translate high-level source code into machine code or intermediate code before execution (Correct answer)

Correct answer: To translate high-level source code into machine code or intermediate code before execution

A compiler translates the entire source code of a high-level language into machine code (or bytecode) as a one-time process before the program is executed.

Question 97: What is Biochemical Oxygen Demand (BOD) a measure of?

The amount of oxygen microorganisms need to decompose organic matter in water (Correct answer)
The total nitrogen content of wastewater
The concentration of dissolved oxygen in water
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 98: Which of the following is the component of brick earth that is most crucial?

Alumina
Lime
Silica (Correct answer)
Magnesia

Correct answer: Silica

Silica is considered the most crucial component of brick earth, typically making up 50-60% of its composition. It prevents cracking, shrinking, and warping of raw bricks during drying and firing, and significantly contributes to the strength and durability of the fired brick. While other components are important, silica provides the essential skeletal structure and resistance to deformation.

Question 99: What is the purpose of staging in multistage rockets?

To reduce aerodynamic drag by changing the nose shape during flight
To allow different propellants to be used at different altitudes
To jettison empty propellant mass so remaining engines propel a lighter vehicle (Correct answer)
To enable thrust vector control at each phase of flight

Correct answer: To jettison empty propellant mass so remaining engines propel a lighter vehicle

By discarding empty tankage and engines, staging continuously reduces the mass that must be accelerated, dramatically increasing the achievable delta-V per the Tsiolkovsky rocket equation.

Question 100: What does a transformer primarily use to transfer energy between circuits?

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

Correct answer: Mutual inductance

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

Question 101: In fatigue analysis, what does the S-N curve (Wöhler curve) relate?

Static stress to total strain
Cyclic stress amplitude to the number of cycles to failure (Correct answer)
Material strength to temperature
Shear stress to torsional frequency

Correct answer: Cyclic stress amplitude to the number of cycles to failure

The S-N curve plots stress amplitude (S) against the number of load cycles (N) to failure, characterizing a material's fatigue behavior under cyclic loading.

Question 102: In ceramics, what causes brittleness compared to metals?

The large grain size in crystalline ceramics
The presence of glassy phases at grain boundaries
The dominance of ionic and covalent bonds that prevent dislocation movement (Correct answer)
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 103: What is the purpose of a 'recycle stream' in a chemical process?

To separate byproducts from the main product stream
To cool the reactor by removing heat continuously
To return unreacted feed material to the reactor to improve overall conversion (Correct answer)
To purge inert gases that accumulate in the system

Correct answer: To return unreacted feed material to the reactor to improve overall conversion

Recycle streams return unconverted reactants from the separator back to the reactor inlet, increasing the overall conversion per pass through the process.

Question 104: What is the primary mechanism by which reverse osmosis (RO) purifies water?

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

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 105: What is the primary function of the ALU (Arithmetic Logic Unit) in a CPU?

To control input/output operations
To perform arithmetic and logical operations on data (Correct answer)
To store program instructions
To manage memory addressing

Correct answer: To perform arithmetic and logical operations on data

The ALU performs all arithmetic (addition, subtraction) and logical (AND, OR, NOT) operations on binary data as directed by the control unit.

Question 106: Which theorem states that any linear two-terminal network can be replaced by an equivalent voltage source in series with an impedance?

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

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 107: In computer architecture, what is cache memory?

The main RAM used for running programs
A virtual memory space on the hard disk
A large magnetic storage device for long-term data
A small, fast memory close to the CPU that stores frequently accessed data (Correct answer)

Correct answer: A small, fast memory close to the CPU that stores frequently accessed data

Cache memory is a small, high-speed SRAM buffer between the CPU and main memory that reduces latency by storing frequently or recently accessed data and instructions.

Question 108: What is the primary role of surfactant in the lungs from a biofluid mechanics perspective?

Increasing pulmonary vascular resistance
Decreasing mucus viscosity in the airways
Increasing alveolar surface tension to improve oxygen diffusion
Reducing alveolar surface tension to prevent alveolar collapse (Correct answer)

Correct answer: Reducing alveolar surface tension to prevent alveolar collapse

Pulmonary surfactant reduces surface tension at the air-liquid interface within alveoli, preventing their collapse (atelectasis) during exhalation.

Question 109: In soil mechanics, the coefficient of consolidation (Cv) is used to predict:

The rate at which excess pore water pressure dissipates over time (Correct answer)
The shear strength of saturated clay
The bearing capacity of a shallow foundation
The angle of internal friction of granular soils

Correct answer: The rate at which excess pore water pressure dissipates over time

Cv governs the time-rate of consolidation settlement by describing how quickly pore water drains from compressible soil.

Question 110: Which of the following is a primary component of an organic compound?

Carbon, Oxygen and Sulphur
Carbon, Oxygen and Hydrogen (Correct answer)
Carbon, Oxygen and Sulphur
Carbon, Oxygen and Nitrogen

Correct answer: Carbon, Oxygen and Hydrogen

Organic compounds are primarily defined by the presence of carbon atoms, typically bonded to hydrogen atoms. Oxygen is also a very common element found in many organic compounds, forming functional groups like alcohols, aldehydes, ketones, and carboxylic acids. While other elements like nitrogen, sulfur, and halogens can be present, carbon, hydrogen, and oxygen are the most fundamental and prevalent components.

Question 111: What is the function of a catalyst in a chemical reaction?

Raises the reaction temperature for faster kinetics
Lowers the activation energy without being consumed (Correct answer)
Increases the equilibrium conversion of reactants
Shifts the equilibrium toward products permanently

Correct answer: Lowers the activation energy without being consumed

A catalyst provides an alternative reaction pathway with lower activation energy and is regenerated at the end of the reaction.

Question 112: Which water treatment process removes suspended solids by allowing them to settle under gravity?

Disinfection
Sedimentation (Correct answer)
Filtration
Coagulation

Correct answer: Sedimentation

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

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.

Questions

35 min

Time Limit

70%

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