Mechanical Aptitude Mechanical Aptitude Knowledge 3

Question 1

Two gears mesh together. Gear A has 10 teeth and spins at 200 RPM. Gear B has 40 teeth. How fast does Gear B spin?

Accepted Answer

50 RPM

Answer

Speed ratio is inverse to tooth ratio: 200 × (10/40) = 50 RPM.

Question 2

A cam converts:

Accepted Answer

Rotational motion to linear/reciprocating motion

Answer

A cam (rotating eccentric shape) pushes a follower up and down, converting rotation into reciprocating linear motion.

Question 3

Which type of stress occurs when a rope is being pulled from both ends?

Accepted Answer

Tension

Answer

Tension is the pulling or stretching force that acts along the length of an object.

Question 4

Water flows through a pipe that narrows from 4 inches to 2 inches in diameter. The water speed in the narrow section will:

Accepted Answer

Increase by four times

Answer

Flow continuity requires that speed increases by the ratio of areas; a halved diameter means 1/4 the area, so speed quadruples.

Question 5

A spring with a spring constant of 10 N/m is stretched 0.5 m. What force does it exert?

Accepted Answer

5 N

Answer

Hooke's Law: F = k × x = 10 × 0.5 = 5 N.

Mechanical Aptitude Test Practice Test