Mechanical Aptitude Levers, Pulleys, and Gears Questions and Answers 3

Question 1

What advantage does a block-and-tackle pulley system provide over a single fixed pulley?

Accepted Answer

Provides mechanical advantage to reduce required force

Answer

Changes direction of force only

Answer

Increases the speed of lifting

Answer

Reduces the weight of the load

Question 2

In a gear train, an idler gear between the driver and driven gear changes what?

Accepted Answer

The direction of rotation of the output

Answer

The gear ratio

Answer

The torque output

Answer

The speed of the output

Question 3

A third-class lever sacrifices mechanical advantage but gains what benefit?

Accepted Answer

Greater speed and range of motion at the output

Answer

Greater force output

Answer

Reduced friction

Answer

Ability to reverse force direction

Question 4

What is a planetary gear set (epicyclic gear train) commonly used for?

Accepted Answer

Providing multiple gear ratios in a compact space

Answer

Converting rotary to linear motion

Answer

Connecting non-parallel shafts

Answer

Reducing vibration only

Question 5

What is the mechanical advantage of a fixed pulley?

Accepted Answer

1

Answer

0.5

Answer

2

Answer

Depends on the pulley size

Question 6

Bevel gears are used to transmit motion between shafts that are oriented at what angle?

Accepted Answer

An angle (typically 90°)

Answer

Parallel

Answer

The same axis

Answer

Random angles