Millwright Certification Mechanical Systems 2

Question 1

What is the primary advantage of a flexible jaw coupling over a rigid coupling in a mechanical drive system?

Accepted Answer

It accommodates minor misalignment and absorbs shock loads

Answer

It transmits more torque

Answer

It operates at higher speeds

Answer

It requires no maintenance

Question 2

In a V-belt drive system, what does belt deflection testing determine?

Accepted Answer

Whether the belt tension is within the correct operating range

Answer

The belt material composition

Answer

The belt's remaining useful life

Answer

The sheave groove angle

Question 3

What is backlash in a gear system, and why is some amount necessary?

Accepted Answer

It is the clearance between mating gear teeth that allows for lubrication and thermal expansion

Answer

It is gear tooth breakage from overload

Answer

It is reverse rotation of the output shaft

Answer

It is vibration caused by gear tooth wear

Question 4

When installing a roller chain drive, what is the correct method for measuring chain elongation to determine if replacement is needed?

Accepted Answer

Measure a span of pins and compare to nominal pitch length, replace at 3% elongation

Answer

Weigh the chain and compare to new chain weight

Answer

Check the chain color for discoloration

Answer

Count the number of broken rollers

Question 5

What is the function of a clutch in an industrial mechanical drive system?

Accepted Answer

To connect and disconnect the driver from the driven load while the driver continues running

Answer

To change the direction of shaft rotation

Answer

To reduce shaft speed

Answer

To increase torque output

Question 6

Why must sheave grooves be inspected when replacing V-belts?

Accepted Answer

Worn grooves cause belts to ride too deep, reducing grip and belt life

Answer

To check for proper paint coating

Answer

To verify the sheave material is compatible

Answer

To measure the sheave temperature