MS MS in Mechanical Engineering 2

Question 1

In materials science, what is the 'yield strength' of a material?

Accepted Answer

The stress at which a material begins to deform plastically

Answer

The maximum stress a material can withstand before fracture

Answer

The stress at the elastic limit divided by strain

Answer

The energy absorbed during fracture per unit area

Question 2

What does CNC stand for in manufacturing?

Accepted Answer

Computer Numerical Control

Answer

Centralized Network Computing

Answer

Continuous Numerical Cutting

Answer

Composite Nano Coating

Question 3

Which law relates the pressure and volume of an ideal gas at constant temperature?

Accepted Answer

Boyle's Law

Answer

Charles's Law

Answer

Gay-Lussac's Law

Answer

Dalton's Law

Question 4

What is 'fatigue failure' in mechanical engineering?

Accepted Answer

Fracture caused by repeated cyclic loading at stresses below the static yield strength

Answer

Sudden brittle fracture due to single overload

Answer

Gradual corrosion weakening a component over time

Answer

Deformation caused by sustained high-temperature loading

Question 5

Which theorem in static analysis states that the sum of moments about any point equals zero for a body in equilibrium?

Accepted Answer

Principle of moments (rotational equilibrium)

Answer

Theorem of virtual work

Answer

Castigliano's theorem

Answer

Superposition principle

Question 6

In control systems, what does PID stand for?

Accepted Answer

Proportional-Integral-Derivative

Answer

Power-Input-Distribution

Answer

Phase-Induced Damping

Answer

Pressure-Inertia-Displacement