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

Yield strength is the stress level at which a material transitions from elastic (reversible) to plastic (permanent) deformation, marking the end of the linear elastic region.

Question 2

What does CNC stand for in manufacturing?

Accepted Answer

Computer Numerical Control

Answer

Computer Numerical Control (CNC) refers to automated machine tools controlled by pre-programmed computer sequences that precisely direct cutting tools, lathes, and mills.

Question 3

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

Accepted Answer

Boyle's Law

Answer

Boyle's Law states that for a fixed amount of ideal gas at constant temperature, pressure and volume are inversely proportional (PV = constant).

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

Fatigue failure occurs when a material fractures after repeated cyclic stress applications, even at stress levels well below its static yield strength, due to crack initiation and propagation.

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

The principle of rotational equilibrium states that for a stationary rigid body, the sum of all torques about any arbitrary point must equal zero.

MS - Master of Science Practice Test

MS - Master of Science Practice Test

MS MS in Mechanical Engineering 2