433A Mechanical Drives and Bearings

Question 1

What is the primary purpose of a keyway in a shaft-to-hub connection?

Accepted Answer

To transmit torque between the shaft and the component

Answer

A keyway and key create a positive mechanical connection that transmits torque from the shaft to the mounted component such as a gear or pulley.

Question 2

Which type of bearing is best suited for handling both radial and thrust loads simultaneously?

Accepted Answer

Angular contact ball bearing

Answer

Angular contact ball bearings are designed with their raceways offset so they can handle combined radial and axial (thrust) loads simultaneously.

Question 3

What is the correct procedure when installing a tapered roller bearing on a shaft?

Accepted Answer

Set the proper endplay or preload using a shim or locknut

Answer

Tapered roller bearings require precise endplay or preload adjustment during installation, typically achieved using shims, spacers, or locknuts to ensure proper operation and longevity.

Question 4

In a V-belt drive system, what does excessive belt deflection indicate?

Accepted Answer

The belt tension is too low

Answer

Excessive belt deflection beyond manufacturer specifications indicates insufficient belt tension, which leads to slippage, reduced power transmission, and accelerated belt wear.

Question 5

What is the function of a backstop in a gear reducer?

Accepted Answer

To prevent reverse rotation of the driven shaft

Answer

A backstop (anti-reverse device) prevents the output shaft of a gear reducer from rotating in the reverse direction, critical in applications like inclined conveyors where reverse rotation could cause material runback.

Red Seal Millwright 433A Practice Test

Red Seal Millwright 433A Practice Test

433A Mechanical Drives and Bearings