IBEW Mechanical Principles and Pulleys 2

Question 1

A fixed pulley changes the direction of force but not the amount. If you pull down with 50 lbs on a fixed pulley, how much weight does it lift?

Accepted Answer

50 lbs

Answer

25 lbs

Answer

100 lbs

Answer

75 lbs

Question 2

A movable pulley system has 2 rope segments supporting the load. What is the mechanical advantage?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 3

A gear with 20 teeth meshes with a gear with 40 teeth. If the smaller gear rotates at 100 RPM, what is the speed of the larger gear?

Accepted Answer

50 RPM

Answer

200 RPM

Answer

100 RPM

Answer

25 RPM

Question 4

A lever has a 6-foot effort arm and a 2-foot resistance arm. What is the mechanical advantage?

Accepted Answer

3

Answer

1/3

Answer

2

Answer

4

Question 5

Which type of pulley system provides the greatest mechanical advantage: a single fixed pulley, a single movable pulley, or a block and tackle with 4 rope segments?

Accepted Answer

Block and tackle with 4 segments

Answer

Single fixed pulley

Answer

Single movable pulley

Answer

They are all equal

Question 6

A wheel and axle has a wheel radius of 12 inches and an axle radius of 3 inches. What is the mechanical advantage?

Accepted Answer

4

Answer

3

Answer

5

Answer

6