Mechanical Aptitude Questions and Answers 3

Question 1

What is the difference between potential energy and kinetic energy?

Accepted Answer

Potential energy is stored energy; kinetic energy is energy of motion

Answer

Kinetic energy is stored energy; potential energy is energy of motion

Answer

They are the same thing measured differently

Answer

Potential energy applies only to springs

Question 2

Why does a spinning gyroscope resist changes to its orientation?

Accepted Answer

Conservation of angular momentum

Answer

Centrifugal force pushes outward

Answer

Gravity is reduced while spinning

Answer

Air friction stabilizes it

Question 3

What is the function of a counterweight in a crane?

Accepted Answer

To balance the load and prevent the crane from tipping over

Answer

To increase the crane's lifting speed

Answer

To reduce the crane's weight

Answer

To power the crane's engine

Question 4

What is the advantage of using a worm-and-wheel gear system in a lifting device?

Accepted Answer

It is self-locking, preventing the load from dropping when the input stops

Answer

It provides very fast lifting

Answer

It has zero friction

Answer

It increases both speed and torque

Question 5

What effect does increasing the length of a pendulum have on its period?

Accepted Answer

Period increases

Answer

Period decreases

Answer

Period stays the same

Answer

Period becomes zero

Question 6

What is the center of gravity of an object?

Accepted Answer

The point where all the weight can be considered to act

Answer

The geometric center of the object

Answer

The heaviest part of the object

Answer

The bottom of the object