Mechanical Aptitude FREE Mechanical Aptitude Knowledge Question and Answers 3

Question 1

A class 2 lever has the load positioned between the fulcrum and the effort. Which of the following is an example?

Accepted Answer

A wheelbarrow

Answer

A wheelbarrow is a class 2 lever where the load sits between the fulcrum (wheel) and the effort (handles).

Question 2

Two meshing gears have 20 and 60 teeth respectively. If the smaller gear rotates at 300 RPM, what is the speed of the larger gear?

Accepted Answer

100 RPM

Answer

The gear ratio is 60/20 = 3, so the larger gear turns at 300/3 = 100 RPM.

Question 3

Which material property describes its ability to return to its original shape after a load is removed?

Accepted Answer

Elasticity

Answer

Elasticity is the property that allows a material to deform under stress and return to its original shape once the stress is removed.

Question 4

A 150-pound person stands exactly in the center of a 10-foot beam supported at both ends. What is the reaction force at each support?

Accepted Answer

75 pounds

Answer

When a load is centered on a simply supported beam, each support carries exactly half the load: 150/2 = 75 pounds.

Question 5

What happens to the pressure in a closed container of gas if the temperature is doubled while the volume remains constant?

Accepted Answer

Pressure doubles

Answer

According to Gay-Lussac's Law, at constant volume, pressure is directly proportional to absolute temperature, so doubling temperature doubles pressure.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

Mechanical Aptitude FREE Mechanical Aptitude Knowledge Question and Answers 3