Millwright Certification Power Transmission and Drive Systems 2

Question 1

What is the main advantage of a synchronous (timing) belt over a standard V-belt?

Accepted Answer

No slip — positive engagement between belt teeth and sprocket

Answer

Synchronous belts mesh with toothed sprockets for positive, slip-free power transmission, maintaining exact speed ratios.

Question 2

A chain drive produces excessive noise and vibration. The MOST likely cause is:

Accepted Answer

Worn or elongated chain links

Answer

A worn or elongated chain increases pitch length, causing it to ride up on the sprocket teeth and creating impact noise and vibration.

Question 3

Which type of gear is used to transmit power between shafts that are parallel but offset?

Accepted Answer

Helical gear

Answer

Helical gears on parallel shafts (including double helical/herringbone) transmit power smoothly between parallel shafts, including offset parallel arrangements.

Question 4

When installing a flexible jaw coupling, the correct gap between the two hubs is determined by:

Accepted Answer

The manufacturer's specification for axial float

Answer

The axial gap (also called float or end play) between jaw coupling hubs must match the manufacturer's specification to allow for thermal expansion and shaft movement.

Question 5

To increase the speed ratio of a V-belt drive without changing the belt length, a millwright should:

Accepted Answer

Increase the diameter of the driver sheave

Answer

Increasing the driver (input) sheave diameter increases the peripheral speed difference, resulting in a higher speed ratio at the driven sheave.

Blog Practice Test

Blog Practice Test

Millwright Certification Power Transmission and Drive Systems 2