Bachelor of Engineering Science Flashcards
7 cards from real BE/B Eng Bachelor of Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Bachelor of Engineering Science flashcards as text
Which failure theory is most appropriate for predicting yielding in ductile metals under multiaxial stress?
Answer: Maximum shear stress (Tresca) theory
The Tresca (maximum shear stress) theory and von Mises theory are both well-suited for ductile metals; Tresca is more conservative and widely used in pressure vessel design.
What is the primary advantage of using a PID controller over a proportional-only controller?
Answer: Elimination of steady-state error
The integral term in a PID controller accumulates error over time, driving steady-state error to zero for step inputs, which a proportional-only controller cannot achieve.
In chemical engineering, what does the term 'selectivity' refer to in a chemical reactor?
Answer: The ratio of desired product formed to undesired product formed
Selectivity measures how much of the reacted feed goes to the desired product versus unwanted byproducts, distinguishing it from conversion which only measures reactant consumption.
In surveying, the term 'benchmark' refers to:
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.
Which signal type has a continuous range of values and is defined at every instant in time?
Answer: Analog signal
An analog signal is continuous in both time and amplitude, whereas digital signals are discrete in both dimensions.
In environmental engineering, BOD (Biochemical Oxygen Demand) measures:
Answer: The oxygen required by microorganisms to decompose organic matter
BOD is the amount of dissolved oxygen consumed by biological organisms when decomposing organic matter in water at a given temperature over a specific time period (typically 5 days at 20°C).
Fourier's law of heat conduction states that heat flux q is proportional to:
Answer: The negative temperature gradient
Fourier's law states q = −k(dT/dx), where heat flows from hot to cold regions proportional to the negative temperature gradient and thermal conductivity k.