Mechanical Aptitude Knowledge Questions and Answers 2

Question 1

What simple machine is a doorknob an example of?

Accepted Answer

Wheel and axle

Answer

A doorknob is an example of a wheel and axle. The knob acts as the wheel (larger diameter), and the spindle that retracts the latch acts as the axle (smaller diameter). This provides mechanical advantage by converting a large rotation into a smaller, more forceful rotation.

Question 2

What is the purpose of a flywheel in an engine?

Accepted Answer

To store rotational energy and smooth out power delivery

Answer

A flywheel is a heavy rotating disc that stores rotational kinetic energy. In an engine, it smooths out the intermittent power pulses from the pistons, maintaining more constant rotational speed between firing strokes.

Question 3

Which material property describes how well a material can be permanently deformed without breaking?

Accepted Answer

Ductility

Answer

Ductility is the ability of a material to undergo significant plastic deformation before fracture. Highly ductile materials like copper and gold can be drawn into thin wires without breaking.

Question 4

What does a torque wrench measure?

Accepted Answer

The tightening force applied to a fastener

Answer

A torque wrench measures and controls the rotational force (torque) applied when tightening bolts and nuts. This ensures fasteners are tightened to precise specifications, preventing both under-tightening (loose connections) and over-tightening (damaged threads or components).

Question 5

What type of energy does a compressed spring store?

Accepted Answer

Elastic potential energy

Answer

A compressed (or stretched) spring stores elastic potential energy. This energy is released when the spring returns to its natural length, converting into kinetic energy. The energy stored equals ½kx², where k is the spring constant and x is the displacement.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Knowledge Questions and Answers 2