Single phase Motors

Question 1

Resistance Start Induction Run
A) good start torque B)poor start torque

Answer 1

B) poor start torque

Question 2

Resistance Start Induction Run
A) poor run torque
B) good run torque

Answer 2

A) poor run torque

Question 3

Is a Resistance Start Induction Run motor capable of variable speeds?

Answer 3

No, constant fixed speeds

Question 4

In a resistance Start Induction Run is the start torque or run torque higher

Answer 4

Start torque (2-4X higher than running)

Question 5

What do you do with the start winding in a resistance Start Induction Run motor

Answer 5

Disconnect the start winding

Question 6

Cap start Induction Run motor
A) high start torque
B) poor start torque

Answer 6

A) high start torque

Question 7

Cap start Induction Run
A) high Run torque
B) poor Run torque

Answer 7

A) poor run torque

Question 8

Is a cap start Induction Run capable of variable speeds

Answer 8

No, fixed speeds

Question 9

What is a desirable quality of a cap start Induction Run motor

Answer 9

Reduced inrish current

Question 10

What needs to be done with the start winding and cap of a cap start Induction Run motor

Answer 10

Disconnect the start winding and cap

Question 11

Does a cap start cap run (1 cap) have
A) high start torque
B) Poor start torque

Answer 11

A) good start torque

Question 12

Does a cap start cap run (1 cap) have
A) good run torque
B) poor run torque

Answer 12

A) good run torque

Question 13

Is the speed of a cap start capr run (1 cap) motor adjustable

Answer 13

No, constant fixed speeds

Question 14

What must be done with the start winding in a cap start cap run (1 cap) motor

Answer 14

Nothing

Question 15

What is a desirable feature of a cap start cap run (1 cap) motor

Answer 15

Reduced inrush current

Question 16

Does a cap start cap run (2 cap) motor have
A) high start torque
B) poor start torque

Answer 16

A) high start torque

Question 17

Does a cap start cap run (2 cap) have
A) high Run torque
B) poor run torque

Answer 17

A) high (excellent) Run torque

Question 18

Is a cap start cap run (2 cap) motor capable of variable speed

Answer 18

No, constant fixed speeds

Question 19

What is a desirable feature of a cap start cap run (2 cap) motor

Answer 19

Low inrush current

Question 20

What must be done with the cap of a cap start cap run (2 cap) motor

Answer 20

Electrolytic cap must be removed

Question 21

A shaded pole motor has
A) good start torque
B) poor start torque

Answer 21

B) poor start torque.
Lowest of all single phase motors

Question 22

A shaded pole motor has
A) good run torque
B) poor run torque

Answer 22

B) poor run torque.
Worst run torque of all single phase motors

Question 23

Is a shaded pole motor capable of variable speeds

Answer 23

No, constant fixed speed

Question 24

The efficiency of a shaded pole motor is

Answer 24

Poor

Question 25

How is rotation of a shaded pole motor accomplished

Answer 25

Shaded coil rings in the motor distort alternating fields

Question 26

A universal (series) motor has
A) good start torque
B) poor start torque

Answer 26

A) good start torque

Question 27

Is a universal (series) motor capable of speed control

Answer 27

Yes. Good speed control, bad speed regulation

Question 28

How can a universal (series) motor be started

Answer 28

By AC or DC

Question 29

How is the DC current supplied to the universal (series) motor

Answer 29

Brushes and a commutator

Question 30

How is the AC power supplied to a universal (series) motor

Answer 30

Slip rings X 2

Question 31

The run winding has

Answer 31

Large wire, few turns. Low resistance

Question 32

The start winding has

Answer 32

Smaller wire, more turns. High resistance