Bennett Mechanical Gears and Belt Drives Questions and Answers

Question 1

In the gear train shown, the driver gear A has 40 teeth and rotates clockwise.
Gear B has 20 teeth, and Gear C has 40 teeth.
In which direction and at what relative speed does Gear C rotate compared to Gear A?

Accepted Answer

Clockwise, at the same speed as Gear A.

Answer

Counter-clockwise, faster than Gear A.

Answer

Clockwise, slower than Gear A.

Answer

Counter-clockwise, at the same speed as Gear A.

Question 2

A small pulley (X) is connected to a large pulley (Y) by a crossed belt. If pulley X rotates counter-clockwise, what will be the motion of pulley Y?

Accepted Answer

It will rotate clockwise and slower.

Answer

It will rotate counter-clockwise and slower.

Answer

It will rotate clockwise and faster.

Answer

It will not rotate.

Question 3

If gear X makes 10 full rotations, how many full rotations will gear Z make?

Accepted Answer

20

Answer

5

Answer

10

Answer

40

Question 4

Which of the following arrangements would result in the greatest increase in torque from the driver shaft to the driven shaft?

Accepted Answer

A small driver gear turning a large driven gear.

Answer

A large driver gear turning a small driven gear.

Answer

Two gears of the same size connected by a chain.

Answer

Two pulleys of the same size connected by a belt.

Question 5

Two pulleys are connected by a standard, un-crossed belt. The driver pulley has a diameter of 10 inches and the driven pulley has a diameter of 5 inches. If the driver pulley rotates at 100 RPM, what is the speed of the driven pulley?

Accepted Answer

200 RPM

Answer

50 RPM

Answer

100 RPM

Answer

25 RPM

Question 6

If the handle is turned clockwise as indicated by the arrow, which direction will the rack (toothed bar) move?

Accepted Answer

To the right

Answer

Up

Answer

To the left

Answer

Down

In the gear train shown, the driver gear A has 40 teeth and rotates clockwise.Gear B has 20 teeth, and Gear C has 40 teeth.In which direction and at what relative speed does Gear C rotate compared to Gear A?

In the gear train shown, the driver gear A has 40 teeth and rotates clockwise.
Gear B has 20 teeth, and Gear C has 40 teeth.
In which direction and at what relative speed does Gear C rotate compared to Gear A?