Motors And Controllers

Question 1

What are the four main parts of a split phase motor?

Answer 1

Rotor, stator, end plates, and centrifugal switch.

Question 2

What 3 parts does the rotor consist of?

Answer 2

Core, shaft, squirrel caged winding

Question 3

The core is made up of what?

Answer 3

Sheet steel called laminations

Question 4

What’s is the stator made up off? (Split phase motor)

Answer 4

Laminated iron core with semi closed slots

Steel frame

Two windings of insulated copper called the running and starting windings.

Question 5

What purpose do end bells have?

Answer 5

Serve to keep the rotor in perfect alignment.

Question 6

Sleeve or ball bearings support the weight of the rotor and thus permit it to rotate without rubbing on the stator. True or false?

Answer 6

True

Question 7

Where is the centrifugal switch located?

Answer 7

Inside the motor on one of the end bells.

Question 8

When will the centrifugal switch disconnect the starting winding?

Answer 8

When it has reached a predetermined speed, usually 75 percent of the full load speed.

Question 9

What does preventive maintenance mean?

Answer 9

Taking care of the trouble before it happens.

Question 10

Should the rotor have more than 1/64-inch end play, place fiber washers on the shaft to line the rotor up properly. True or false?

Answer 10

True

Question 11

How much amperage does the transformer of the tool tester pass through the tool cord equipment ground?

Answer 11

30

Question 12

What are the four main parts of a split phase motor?

Answer 12

Rotor, stator, end plates, and centrifugal switch.

Question 13

What 3 parts does the rotor consist of?

Answer 13

Core, shaft, squirrel caged winding

Question 14

The core is made up of what?

Answer 14

Sheet steel called laminations

Question 15

What’s is the stator made up off? (Split phase motor)

Answer 15

Laminated iron core with semi closed slots

Steel frame

Two windings of insulated copper called the running and starting windings.

Question 16

What purpose do end bells have?

Answer 16

Serve to keep the rotor in perfect alignment.

Question 17

Sleeve or ball bearings support the weight of the rotor and thus permit it to rotate without rubbing on the stator. True or false?

Answer 17

True

Question 18

Where is the centrifugal switch located?

Answer 18

Inside the motor on one of the end bells.

Question 19

When will the centrifugal switch disconnect the starting winding?

Answer 19

When it has reached a predetermined speed, usually 75 percent of the full load speed.

Question 20

What does preventive maintenance mean?

Answer 20

Taking care of the trouble before it happens.

Question 21

Should the rotor have more than 1/64-inch end play, place fiber washers on the shaft to line the rotor up properly. True or false?

Answer 21

True

Question 22

How much amperage does the transformer of the tool tester pass through the tool cord equipment ground?

Answer 22

30

Question 23

What is the difference between a split phase motor and a capacitor motor?

Answer 23

The capacitor motor has a additional unit, called a capacitor

Question 24

What does the capacitor act as?

Answer 24

A storage unit

Question 25

What kind of capacitor is used for in fractional horsepower motors?

Answer 25

Paper capacitor

Question 26

The difference between a split phase motor and capacitor motor?

Answer 26

The capacitor motor provides a higher starting torque with a lower starting current than a split phase motor.

Question 27

If the capacitor in the motor has been defective due to moisture, overheating or another condition, how do you repair?

Answer 27

You replace the capacitor with the same value of capacity.

Question 28

What kind of power does a universal motor operate on?

Answer 28

Either single phase AC or DC power

Question 29

The salient-pole type is the most common type of __________ motor.

Answer 29

Universal

Question 30

What does a salient- pole type motor consist of?

Answer 30

Stator with two concentrated field windings, a wound rotor, A commutator, and brushes.

Question 31

The shaded pole motor is a single phase induction motor that uses its own method to produce starting torque. True or false

Answer 31

True

Question 32

All single phase induction motors need what to provide the motor with starting torque.

Answer 32

Auxiliary means

Question 33

How can you control the speed of a shaded pole motor? (Fan)

Answer 33

The speed of these motors is varied by inserting a choke cool in series with the main winding. Taps on the choke cool provide different speeds

Question 34

What parts does a three phase motor made of?

Answer 34

Stator, rotor, and end bells

Question 35

Generators convert mechanical motion into electrical energy using what principal?

Answer 35

Magnetic induction

Question 36

Wye connection is joined together by ____________ the windings.

Answer 36

Paralleling

Question 37

A delta connection is one in which the end of each phase is connected in _______ with the next phase.

Answer 37

Series

Question 38

How do you connect high voltage wye connection?

Answer 38

Connect T6 and T9 Connect T4 and T7 Connect T5 and T8 Connect T1, T2 and T3 to the three phase lines

Question 39

How do you connect low voltage wye connection?

Answer 39

Connect t7 to T1 Connect T8 to T2 Connect T9 to T3 Connect T4, T5, and T6 together

Question 40

The term controller includes what?

Answer 40

Any switch or device normally used to start or stop a motor

Question 41

Controllers are classified as either magnetic or manual. True or false?

Answer 41

True