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

The second law states that the total entropy of an isolated system can only increase over time, never decrease, for any real process.

Question 2

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

Accepted Answer

Whether flow is laminar or turbulent

Answer

The Reynolds number (Re = ρVL/μ) predicts the flow regime — laminar flow typically occurs below Re ≈ 2300 and turbulent flow above Re ≈ 4000 in pipes.

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

FEM divides a complex domain into smaller finite elements and solves governing equations numerically, enabling analysis of structures under various loading conditions.

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

Fatigue is the weakening of a material caused by repeatedly applied cyclic stresses, leading to crack initiation and eventual fracture at stress levels below the ultimate tensile strength.

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

The NTU-effectiveness method determines heat exchanger performance without requiring knowledge of outlet temperatures, using the number of transfer units and capacity rate ratio.

MS - Master of Science Practice Test

MS - Master of Science Practice Test

MS Master of Mechanical Engineering