Bennett Mechanical Test Gears and Belt Drives 2

Question 1

A driver gear with 10 teeth meshes with a driven gear of 40 teeth. What is the gear ratio?

Accepted Answer

1:4

Answer

The ratio of driver to driven teeth is 10:40, which simplifies to 1:4.

Question 2

When a small gear drives a large gear, what happens to the rotational speed?

Accepted Answer

Speed decreases

Answer

Driving a larger gear reduces output speed while increasing torque.

Question 3

Two gears that mesh directly will rotate in which directions relative to each other?

Accepted Answer

Opposite directions

Answer

Externally meshed gears always turn in opposite directions.

Question 4

An idler gear placed between a driver and driven gear primarily changes what?

Accepted Answer

The direction of rotation

Answer

An idler reverses rotation direction without altering the overall ratio.

Question 5

If a belt drive has a large pulley driving a small pulley, the small pulley will turn:

Accepted Answer

Faster

Answer

A smaller driven pulley spins faster than the larger driving pulley.

Bennett Mechanical Test Practice Test