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

Potential energy is stored energy due to an object's position or configuration (gravitational PE, elastic PE, chemical PE). Kinetic energy is the energy an object possesses due to its motion (KE = ½mv²).

Question 2

Why does a spinning gyroscope resist changes to its orientation?

Accepted Answer

Conservation of angular momentum

Answer

A spinning gyroscope resists changes to its axis of rotation due to conservation of angular momentum. A torque applied to the gyroscope causes it to precess (slowly rotate around a different axis) rather than simply tipping over.

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

A counterweight on the opposite side of the crane from the load creates a balancing moment (torque) that prevents the crane from tipping. Its weight and position are calculated to ensure stability under various load conditions.

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

Worm-and-wheel gear systems are self-locking — the wheel cannot drive the worm due to the thread angle and friction. This means a load stays in position without needing a brake when the operator stops turning the worm.

Question 5

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

Accepted Answer

Period increases

Answer

The period of a simple pendulum increases with length: T = 2π√(L/g). A longer pendulum swings more slowly (longer period) because it must travel a greater arc distance for each oscillation.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Questions and Answers 3