TPC 303.1

Question 1

In belt drives, force is transmitted how?

Answer 1

By friction, the power transmitted equals the force multiplied by the speed of the belt

Question 2

What is sheave pitch diameter?

Answer 2

In a v-belt sheave, the pitch diameter is always less than the outside diameter of a sheave

Question 3

Conventional belts are designated how?

Answer 3

A, B, C, D, E. A being the narrowest and E being the widest

Question 4

How are group belts made?

Answer 4

The backing is applied during manufacturing and actually becomes part of the belt, it gives the belt uniform strength

Question 5

Manufacturing include Lubrication fittings on the unit on what type of sheave?

Answer 5

Spring-loaded sheaves

Question 6

What’s the difference between chain drive and belt drives?

Answer 6

Energy is not wasted and the chain drive is more efficient than a belt drive

Question 7

Roller chains include the following parts…

Answer 7

Roller, Bushing, Pin link, Roller link

Question 8

In offset roller chains the sidebars are?

Answer 8

Close together

Question 9

What are type B sprockets?

Answer 9

Flat on one side, but have a slightly extended hub on the other side.

Question 10

What are type C sprockets?

Answer 10

Have hubs extending in both sides

Question 11

How do you install a chain?

Answer 11

Slight amount of sag on the slack side and with the driving side in tension

Question 12

What is working depth in gears?

Answer 12

The depth to which a gear tooth extends into the open space between the teeth of a mating gear

Question 13

Why helical gears over spur gears?

Answer 13

Because of the smooth action of motion

Question 14

In what gear type is there no interference between the teeth?

Answer 14

Herringbone gears

Question 15

What is worm axial pitch?

Answer 15

Distance between the screw threads

Question 16

Because miter-gear boxes are usually used for changing the direction of motion, they are not often thought of as speed reducers, however…

Answer 16

Miter gear boxes can provide small gear ratios, usually between 1:1 and 2:1

Question 17

The first and most important step you must take when you are installing a gear drive is to?

Answer 17

Make sure that it is aligned properly with the machine it is driving

Question 18

The mechanical power rating of a gear drive tells how much power the unit can transmit under a given set of conditions, this rating depends on?

Answer 18

The speed and torque of the gear drive, just as in motors

Question 19

The service factor depends on the?

Answer 19

Duty cycle

Question 20

When is splash lubrication used and what are the cons?

Answer 20

It is commonly used In parallel-shaft gear drives, its cons are the slow speed of some units does not cause enough splashing to provide enough lubrication. In these cases pressurized systems are used

Question 21

What factors are involved in selecting adjustable speed drives?

Answer 21

The drive is selected by the speed required, the speed range, and the power it must deliver

Question 22

How do belt type adjustable speed drives work?

Answer 22

The output shaft rotates at its lowest speed, as the flanges of the sheave are forced closer together, the belt rises to the outer edges of the flanges. The change in position of the belt increases the speed of the output shaft

Question 23

Some adjustable speed drives use?

Answer 23

Gear mechanisms
Pneumatic pistons
Electric motors

Question 24

Adjustable speed drives belts resemble timing belts, when chain is used it is of a?

Answer 24

Modified leaf

Question 25

In roller type adjustable speed drives the conical roller move how?

Answer 25

Axially to change speed

Question 26

How are indicators setup when aligning using the reverse indicator method?

Answer 26

One dial indicator is mounted on the coupling flange of the motor and takes measurements on the pump

The other is mounted on the coupling flange of the pump and takes measurements on the motor

Question 27

A problem may be that the two units need to be lowered however…

Answer 27

You cannot lower one or both below the support base

Question 28

How does face-rim alignment work?

Answer 28

Both indicators are supported on one machine and take measurements from the other machine

Question 29

What is the setup for long shaft alignment?

Answer 29

Two dial indicators on opposite coupling flanges

Question 30

What are the pros of laser alignment?

Answer 30

It makes alignment much easier, faster, and more accurate

Question 31

What are the two classes of jaw couplings?

Answer 31

Rigid and flexible

Question 32

What coupling can be replaced without disturbing the coupling hubs?

Answer 32

Chain coupling

Question 33

Why do shear pin couplings have breakable metal pins that connect the driving hub to the driven hub?

Answer 33

In case of an overload in the driven component

Question 34

The limited end float coupling is made with a?

Answer 34

Thrust plate

Question 35

What couplings simplify the process of disconnecting a driving shaft from the driven shaft?

Answer 35

Spacer couplings

Question 36

While the clutch is disengaged the two devices are ________ of eachother.

Answer 36

Independent, one device can rotate while the other remains stationary.

Question 37

The friction clutch has a shifting mechanism, moving the shifting arm engages?

Answer 37

Or disengages the friction plates

Question 38

An overrunning clutch also called a one way clutch, is often used on machines where the driven equipment…

Answer 38

Can speed up and damage a motor by forcing it to run too fast

Question 39

What clutches start and stop frequently?

Answer 39

Electric clutches

Question 40

What are the main components of a single impeller fluid clutch?

Answer 40

1. Impeller
2. Fluid
3. Clutch housing