MS Master of Mechanical Engineering

Question 1

What does the second law of thermodynamics state about entropy?

Accepted Answer

Entropy of an isolated system always increases or remains constant

Answer

Entropy always decreases in natural processes

Answer

Entropy is conserved in reversible processes

Answer

Entropy is independent of temperature

Question 2

In fluid mechanics, what is the Reynolds number used to predict?

Accepted Answer

Whether flow is laminar or turbulent

Answer

Fluid viscosity

Answer

Pressure drop in a pipe

Answer

Flow rate in open channels

Question 3

What is the Finite Element Method (FEM) used for in mechanical engineering?

Accepted Answer

Numerically solving structural, thermal, and fluid problems by discretizing the domain

Answer

Designing gears and bearings

Answer

Measuring material hardness

Answer

Calculating theoretical stress analytically

Question 4

In the context of material science, what does the term 'fatigue' refer to?

Accepted Answer

Progressive structural damage from repeated cyclic loading

Answer

Instantaneous fracture under static load

Answer

Creep under high temperature

Answer

Corrosion due to chemical exposure

Question 5

What is the purpose of a heat exchanger's NTU (Number of Transfer Units) method?

Accepted Answer

Designing heat exchangers when the outlet temperatures are unknown

Answer

Measuring fluid flow rate

Answer

Calculating pressure drop

Answer

Determining pipe diameter

Question 6

In vibration analysis, what condition occurs when the excitation frequency equals the natural frequency of a system?

Accepted Answer

Resonance

Answer

Damping

Answer

Critical damping

Answer

Isolation