Tpc 342

Question 1

What is the most common type of failure in jaw clutches?

Answer 1

Jaw breakage

Question 2

What can also be considered a takeoff member?

Answer 2

V-belt sheave, shaft, or gear

Question 3

Signs of localized wear could indicate what?

Answer 3

Misalignment of clutch parts

Question 4

Frequent slippage of a brake or clutch can create rapid wear which is usually a sign of?

Answer 4

Overloading

Question 5

Chatter occurs mostly during engagement of the unit. It’s usually caused by?

Answer 5

Loose or faulty actuating devices

Question 6

Friction clutches use one or more discs to?

Answer 6

Transmit torque to the load

Question 7

Remember that rapid wear of friction surfaces usually results from?

Answer 7

Overheating

Question 8

As the slip speed drops to zero what happens to the torque?

Answer 8

It increases

Question 9

What are the units two important factors to dissipate heat?

Answer 9

Its size and its armature speed

Question 10

If the brake or clutch fails to engage properly what should you check?

Answer 10

The voltage supply to the coil

Question 11

At the maximum output speed, the flanges on the input shaft are…

Answer 11

Closest together

Question 12

The best protection for enclosed drives to protect against the unwanted heat is?

Answer 12

To make a homemade baffle

Question 13

How should you go about no load testing?

Answer 13

Operate the drive through its full speed range with no load applied

Question 14

If ridges are present how can you go about removing them from the flanges?

Answer 14

By sanding or polishing

Question 15

In an enclosed drive, high temperatures usually result from overloading the…

Answer 15

Shaft bearings

Question 16

The amount of slip is a measure of the turbines efficiency. It is normally a difference of _____ to _____ percent.

Answer 16

3 to 5 at full load

Question 17

A condition called a stall load can occur where there is 100% slip. That is…

Answer 17

The impeller is rotating, but the turbine isn’t

Question 18

Be sure that you are using the right amount of fluid. Otherwise the slip could become too high and cause…

Answer 18

Overheating

Question 19

When fitted with more than one free rotating stator it is referred to as a…

Answer 19

Polyphase converter-coupling

Question 20

Many seals become hard and cracked after lengthy use, when should you replace them?

Answer 20

Whenever you find them during inspections

Question 21

What ratings are usually expressed in horsepower?

Answer 21

Thermal capacities

Question 22

What permits you to vary the input speed to the gear drive?

Answer 22

Drive with adjustable speed belt

Question 23

The major cause of drive failure is?

Answer 23

Improper lubrication

Question 24

What kind of overload system works by allowing the sprocket to slip when an overload exceeds the torque rating?

Answer 24

Spring-operated overload drive

Question 25

How long should you test run a drive for?

Answer 25

20 to 30 minutes