WTMA Mechanical Comprehension 4

Question 1

An electric motor rated at 1 horsepower (HP) runs continuously. Approximately how many watts does it consume?

Accepted Answer

746 watts

Answer

One mechanical horsepower equals approximately 746 watts, a standard conversion used in motor and engine specifications.

Question 2

Which of the following best explains why a hollow steel pipe is used as a structural beam instead of a solid steel rod of equal weight?

Accepted Answer

A hollow pipe resists bending better due to its cross-sectional shape

Answer

Distributing material away from the neutral axis (as in a hollow tube or I-beam) greatly increases resistance to bending with the same amount of material.

Question 3

A wheel with a 10-inch radius is connected to an axle with a 2-inch radius. If a 10-lb force is applied to the wheel rim, what force is exerted at the axle?

Accepted Answer

50 lbs

Answer

Mechanical advantage of a wheel and axle = wheel radius ÷ axle radius = 10/2 = 5, so output force = 10 × 5 = 50 lbs.

Question 4

A ramp (inclined plane) is 10 feet long and 2 feet high. What is its mechanical advantage?

Accepted Answer

5

Answer

The mechanical advantage of an inclined plane = length of ramp ÷ height = 10 ÷ 2 = 5.

Question 5

A rubber bumper on a car absorbs impact energy. Which physical property makes rubber effective for this purpose?

Accepted Answer

High elasticity and energy absorption

Answer

Rubber's high elasticity allows it to deform under impact and absorb energy, then return to its original shape without transferring all force to the vehicle.

WTMA - Wiesen Test of Mechanical Aptitude Practice Test

WTMA - Wiesen Test of Mechanical Aptitude Practice Test

WTMA Mechanical Comprehension 4