BE/B Eng Bachelor of Engineering Mechanical Engineering

Question 1

Which law of thermodynamics states that energy cannot be created or destroyed, only converted from one form to another?

Accepted Answer

First Law

Answer

Second Law

Answer

Third Law

Answer

Zeroth Law

Question 2

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

Accepted Answer

Entropy always increases or remains constant

Answer

Entropy always decreases

Answer

Entropy remains exactly constant

Answer

Entropy is undefined for isolated systems

Question 3

In stress-strain analysis, Young's Modulus is defined as the ratio of:

Accepted Answer

Stress to strain in the elastic region

Answer

Strain to stress in the plastic region

Answer

Shear stress to shear strain

Answer

Ultimate stress to yield stress

Question 4

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

Accepted Answer

50%

Answer

25%

Answer

75%

Answer

100%

Question 5

Which type of stress acts perpendicular to the cross-sectional area of a member?

Accepted Answer

Normal stress

Answer

Shear stress

Answer

Torsional stress

Answer

Bearing stress

Question 6

In fluid mechanics, what does the Reynolds number represent?

Accepted Answer

The ratio of inertial forces to viscous forces in a fluid flow

Answer

The ratio of pressure forces to surface tension

Answer

The ratio of buoyancy to viscous forces

Answer

The ratio of thermal to momentum diffusivity