433A Mechanical Drives and Bearings 5

Question 1

What type of gear arrangement is used when shafts are at right angles and do not intersect?

Accepted Answer

Worm and worm gear

Answer

Spur gears

Answer

Bevel gears

Answer

Herringbone gears

Question 2

What is the primary cause of spalling on a bearing raceway?

Accepted Answer

Fatigue from cyclic contact stress

Answer

Insufficient lubrication only

Answer

Improper storage before installation

Answer

Excessive shaft speed

Question 3

When measuring shaft runout for a coupling installation, what instrument is typically used?

Accepted Answer

Dial indicator mounted on a magnetic base

Answer

Micrometer

Answer

Vernier caliper

Answer

Straightedge and feeler gauge

Question 4

What advantage does a synchronous belt drive have over a V-belt drive?

Accepted Answer

No speed loss due to slip

Answer

Lower initial cost

Answer

Quieter operation

Answer

Higher maximum speed capability

Question 5

What is the purpose of a bearing isolator compared to a traditional lip seal?

Accepted Answer

It is a non-contact labyrinth seal that prevents contamination without wearing

Answer

It provides higher shaft speed capability only

Answer

It increases the bearing's load rating

Answer

It eliminates the need for lubrication

Question 6

In a gear reducer, what does the service factor account for?

Accepted Answer

The type of driven equipment and operating conditions such as shock loading

Answer

The ambient temperature around the reducer

Answer

The altitude at which the reducer operates

Answer

The brand and model of the motor