WTMA Aptitude Knowledge 2

Question 1

A pulley system has one fixed pulley and one movable pulley. How much force is needed to lift a 200 lb load?

Accepted Answer

100 lb

Answer

A system with one fixed and one movable pulley provides a mechanical advantage of 2, requiring 100 lb to lift a 200 lb load.

Question 2

Which type of gear is used to transmit motion between two shafts at a 90-degree angle?

Accepted Answer

Bevel gear

Answer

Bevel gears have angled teeth and are specifically designed to transmit motion between shafts that intersect at 90-degree angles.

Question 3

A lever with a 6-foot effort arm and a 2-foot resistance arm has a mechanical advantage of:

Accepted Answer

3

Answer

Mechanical advantage of a lever equals effort arm length divided by resistance arm length: 6 ÷ 2 = 3.

Question 4

Water flows through a pipe that narrows from 4 inches to 2 inches in diameter. What happens to the water's speed?

Accepted Answer

It quadruples

Answer

By the continuity equation, when pipe area decreases by a factor of 4 (radius halved), velocity must increase by a factor of 4 to maintain flow rate.

Question 5

A spring stretched 3 inches by a 15 lb force is stretched how far by a 25 lb force?

Accepted Answer

5 inches

Answer

By Hooke's Law, spring constant = 15 ÷ 3 = 5 lb/in; 25 lb ÷ 5 lb/in = 5 inches of stretch.

WTMA - Wiesen Test of Mechanical Aptitude Practice Test