MS MS in Mechanical Engineering 1

Question 1

What is the first law of thermodynamics also known as?

Accepted Answer

Law of conservation of energy

Answer

The first law of thermodynamics states that energy cannot be created or destroyed, only converted from one form to another — it is the law of energy conservation.

Question 2

Which dimensionless number in fluid mechanics represents the ratio of inertial forces to viscous forces?

Accepted Answer

Reynolds number

Answer

The Reynolds number (Re = ρvL/μ) predicts whether flow will be laminar or turbulent by comparing inertial to viscous forces in a fluid.

Question 3

What does FEA stand for in mechanical engineering analysis?

Accepted Answer

Finite Element Analysis

Answer

Finite Element Analysis (FEA) is a numerical method that divides a structure into small elements to simulate stress, strain, heat transfer, and other physical behaviors under load.

Question 4

Which type of stress results when equal and opposite forces act parallel to a cross-sectional surface?

Accepted Answer

Shear stress

Answer

Shear stress (τ = F/A) occurs when forces act parallel to the cross-sectional area, causing adjacent material planes to slide relative to each other.

Question 5

What is the purpose of a heat exchanger in engineering systems?

Accepted Answer

To transfer thermal energy between two fluid streams without mixing them

Answer

Heat exchangers facilitate thermal energy transfer between two fluids at different temperatures through a separating wall, without the fluids mixing.

MS - Master of Science Practice Test

MS - Master of Science Practice Test

MS MS in Mechanical Engineering 1