FCTC Pulleys, Gears, and Levers 5

Question 1

A pulley system requires a worker to pull 12 feet of rope to raise a load 3 feet. What is the mechanical advantage of the system?

Accepted Answer

4

Answer

3

Answer

6

Answer

12

Question 2

A nutcracker is an example of which class of lever?

Accepted Answer

Second-class

Answer

First-class

Answer

Third-class

Answer

It is not a lever

Question 3

In a gear train, which gear arrangement is used to convert rotational motion into linear (straight-line) motion?

Accepted Answer

Rack and pinion

Answer

Spur gears

Answer

Bevel gears

Answer

Worm gears

Question 4

If friction is present in a pulley system, how does it affect the actual mechanical advantage compared to the theoretical value?

Accepted Answer

Actual MA is lower than theoretical

Answer

Actual MA is higher than theoretical

Answer

Friction has no effect on MA

Answer

Actual MA equals theoretical MA

Question 5

A lever has a load of 300 lbs placed 2 feet from the fulcrum. How far from the fulcrum must a 100-lb effort be applied to balance the lever?

Accepted Answer

6 feet

Answer

2 feet

Answer

4 feet

Answer

8 feet

Question 6

Which pulley arrangement provides NO mechanical advantage but is still useful in practical applications?

Accepted Answer

Fixed pulley

Answer

Movable pulley

Answer

Compound pulley

Answer

Block and tackle

Question 7

In a gear train where the driver has 30 teeth and the driven gear has 15 teeth, the output shaft rotates at what speed relative to the input?

Accepted Answer

Twice the input speed

Answer

Half the input speed

Answer

Same as the input speed

Answer

Four times the input speed