433A Mechanical Drives and Bearings 3

Question 1

What is the primary reason for using a spherical roller bearing in heavy industrial applications?

Accepted Answer

It is self-aligning and handles heavy radial and axial loads

Answer

Spherical roller bearings feature a spherical outer raceway that allows them to self-align, accommodating shaft deflection and housing misalignment while carrying very heavy radial and moderate axial loads.

Question 2

When installing a press-fit bearing on a shaft, what is the recommended heating temperature for the bearing?

Accepted Answer

Up to 120°C (250°F)

Answer

Bearings should be heated to a maximum of approximately 120°C (250°F) for installation. Exceeding this temperature can alter the metallurgical properties of the bearing steel and damage seals or shields.

Question 3

What does AGMA stand for in relation to gear standards?

Accepted Answer

American Gear Manufacturers Association

Answer

AGMA stands for American Gear Manufacturers Association, which establishes industry standards for gear design, manufacturing, rating, lubrication, and inspection.

Question 4

In a timing belt drive, what happens if a tooth shears off the belt?

Accepted Answer

The drive loses synchronization between shafts

Answer

Timing belts are positive-drive components that maintain exact synchronization between shafts. If teeth shear off, the precise timing relationship is lost, which can cause equipment damage or product defects.

Question 5

What is the correct way to check bearing clearance using a feeler gauge on a plain bearing?

Accepted Answer

Insert the gauge between the shaft top and bearing cap

Answer

Bearing clearance in a plain (sleeve) bearing is checked by inserting a feeler gauge between the top of the shaft and the top bearing shell (cap) to measure the oil clearance gap.

Red Seal Millwright 433A Practice Test

Red Seal Millwright 433A Practice Test

433A Mechanical Drives and Bearings 3