BE/B Eng Bachelor of Engineering Bachelor of Engineering Science 5

Question 1

Which failure theory is most appropriate for predicting yielding in ductile metals under multiaxial stress?

Accepted Answer

Maximum shear stress (Tresca) theory

Answer

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.

Question 2

What is the primary advantage of using a PID controller over a proportional-only controller?

Accepted Answer

Elimination of steady-state error

Answer

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.

Question 3

In chemical engineering, what does the term 'selectivity' refer to in a chemical reactor?

Accepted Answer

The ratio of desired product formed to undesired product formed

Answer

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.

Question 4

In surveying, the term 'benchmark' refers to:

Accepted Answer

A reference point of known elevation used in leveling surveys

Answer

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

Question 5

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

Accepted Answer

Analog signal

Answer

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

BE/B Eng Bachelor of Engineering Practice Test

BE/B Eng Bachelor of Engineering Practice Test

BE/B Eng Bachelor of Engineering Bachelor of Engineering Science 5