Mixed Deck — All BE/B Eng Bachelor of Engineering Topics Flashcards

In structural analysis, what does the term 'margin of safety' (MS) represent?

Answer: The fractional reserve strength beyond the design limit condition

MS = (Allowable Load / Applied Load) - 1, so MS = 0 means the structure is exactly at its limit and any positive value indicates reserve strength.

Why is the weathering process carried out?

Answer: To improve plasticity

The weathering process involves exposing the dug-out brick earth to the elements, such as rain, sun, and frost, for an extended period, often several months. This exposure helps to soften the clay, break down lumps, and allow any organic matter to decompose. The primary purpose is to significantly improve the plasticity and workability of the clay, making it much easier to mold into desired brick shapes.

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

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.

In the Kanban pull system used in lean manufacturing, a Kanban card or signal serves to:

Answer: Authorize production or replenishment of a specific quantity of items only when downstream consumption creates a need

Kanban is a visual pull signal — production or material movement is triggered only when a downstream station consumes items and sends a signal back upstream requesting replenishment.

What is the primary function of a phase-locked loop (PLL) in spacecraft communication systems?

Answer: To synchronize a local oscillator to the incoming carrier frequency

A PLL tracks and locks onto the incoming carrier's phase and frequency, enabling coherent demodulation of the signal even with Doppler shifts.

Which of the following relates to customer judgments of food?

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.

In gas absorption with a dilute system, the operating line on a y-x diagram is:

Answer: Approximately straight because molar flows are nearly constant

For dilute systems, the gas and liquid molar flow rates are approximately constant, making the operating line nearly linear.

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

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.

Bioelectric potential's natural source is .

Answer: ionic

Bioelectric potentials, such as those responsible for nerve impulses and muscle contractions, are naturally generated in biological systems by the movement and differential distribution of ions across cell membranes. The selective permeability of these membranes to various ions (like sodium, potassium, and chloride) creates an electrochemical gradient, leading to an electrical potential difference that drives these biological signals.

Work sampling differs from traditional time study in that it:

Answer: Estimates the proportion of time spent on activities through random observations taken at random intervals

Work sampling uses statistical random observations to estimate the percentage of time workers or machines spend in various states, without the need for continuous stopwatch observation.

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

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.

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

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.

Which thermodynamic property is minimized at equilibrium for a closed system at constant temperature and pressure?

Answer: Gibbs free energy

At constant T and P, a closed system reaches equilibrium when Gibbs free energy (G) is at its minimum value.

What does PID stand for in control systems?

Answer: Proportional-Integral-Derivative

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

In manufacturing, what does CNC stand for?

Answer: Computer Numerical Control

CNC (Computer Numerical Control) uses pre-programmed computer software to control the movement of machine tools like mills, lathes, and routers.

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

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.

What is the efficiency of an ideal Carnot heat engine operating between temperatures T_H = 600 K and T_C = 300 K?

Answer: 50%

Carnot efficiency η = 1 - T_C/T_H = 1 - 300/600 = 0.50, or 50%; no real engine can exceed this limit between these temperatures.

In the context of GPS navigation, what is dilution of precision (DOP)?

Answer: A geometric factor describing how satellite geometry amplifies ranging errors

DOP quantifies how the spatial arrangement of visible satellites magnifies individual pseudorange errors into position uncertainty; low DOP means well-spread satellites and better accuracy.

What does pipelining in a CPU refer to?

Answer: Overlapping the execution of multiple instructions by dividing processing into stages

CPU pipelining divides instruction execution into discrete stages (fetch, decode, execute, writeback) so multiple instructions can be in different stages simultaneously, improving throughput.

In aerodynamics, what distinguishes attached flow from separated flow?

Answer: In attached flow, boundary layer fluid has enough momentum to follow the surface contour

In attached flow, the adverse pressure gradient has not overcome the boundary layer momentum, keeping the flow hugging the surface; separation occurs when the fluid can no longer maintain contact.