Mechanical Aptitude Simple Machines and Mechanical Advantage Questions and Answers 2

Question 1

A screw has 8 threads per inch. How far does it advance into a material with one complete revolution?

Accepted Answer

0.125 inches

Answer

8 inches

Answer

1 inch

Answer

0.8 inches

Question 2

What is the ideal mechanical advantage of a single movable pulley?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 3

An inclined plane with a mechanical advantage of 5 requires 40 lbs of input force. What load can it raise?

Accepted Answer

200 lbs

Answer

8 lbs

Answer

45 lbs

Answer

400 lbs

Question 4

Machine efficiency is calculated as:

Accepted Answer

Output work ÷ Input work × 100%

Answer

Input work ÷ Output work × 100%

Answer

Mechanical advantage ÷ Velocity ratio

Answer

Force × Distance ÷ Time

Question 5

A doorknob is an example of which simple machine?

Accepted Answer

Wheel and axle

Answer

Lever

Answer

Inclined plane

Answer

Wedge

Question 6

A compound machine combines two or more simple machines. Its primary advantage over a single simple machine is:

Accepted Answer

It can achieve a greater mechanical advantage

Answer

It eliminates friction entirely

Answer

It requires no energy input

Answer

It always changes the direction of force

Question 7

You push a 200 lb box up a ramp that is 8 ft long and 2 ft high. Ignoring friction, how much force is needed?

Accepted Answer

50 lbs

Answer

25 lbs

Answer

400 lbs

Answer

100 lbs