Mechanical Aptitude Mechanical Aptitude Principles 4

Question 1

A screwdriver with a handle diameter of 3 inches turns a screw with shaft diameter of 0.5 inches. What is the mechanical advantage?

Accepted Answer

6

Answer

MA of a wheel and axle = radius of wheel / radius of axle = 1.5 / 0.25 = 6.

Question 2

Which of the following materials is the BEST conductor of heat?

Accepted Answer

Copper

Answer

Copper has high thermal conductivity and is widely used in heat exchangers and cookware.

Question 3

A drive belt connects a 6-inch pulley to a 3-inch pulley. If the larger pulley turns at 200 RPM, how fast does the smaller pulley turn?

Accepted Answer

400 RPM

Answer

Speed ratio is inverse of diameter ratio: 200 × (6/3) = 400 RPM.

Question 4

What does a torque wrench measure?

Accepted Answer

The rotational force applied to a fastener

Answer

A torque wrench measures the rotational force (torque) applied to a fastener to ensure proper tightening.

Question 5

In a closed container, if the temperature of a gas doubles (in Kelvin) while volume stays constant, what happens to pressure?

Accepted Answer

Pressure doubles

Answer

Gay-Lussac's Law states pressure is directly proportional to temperature at constant volume: doubling T doubles P.

Mechanical Aptitude Test Practice Test