CHAPTER 34

Question 1

A two-phase power system has two voltages that are ——.

Answer 1

90 Degree out of phase

Question 2

The —– winding is made of many turns of small wire and is located at the top of the stator core.

Answer 2

start

Question 3

The —– winding is made of a few turns of large wire and is located at the bottom of the stator core.

Answer 3

run

Question 4

In a motor that have a rotating magnetic field,the speed of that magnetic field is referred to as the —–.

Answer 4

synchronous speed

Question 5

In single-phase motors such as the resistance start induction-run motor, the start winding is disconnected by the—–.

Answer 5

centrifugal switch

Question 6

In the shaded-pole induction motor, the shading coil acts like a transformer with a (n) ——- secondary.

Answer 6

shorted

Question 7

in the shaded-pole induction motor, the direction of the magnetic field is determined by the——.

Answer 7

rotor construction

Question 8

The consequent pole motor is a (n) —– speed motor.

Answer 8

three

Question 9

Multispeed fan motors achieve multiple speeds by inserting additional
——– in series with the run winging.

Answer 9

impedance

Question 10

A single-phase synchronous motor is sometimes referred to as a (n) —– motor.

Answer 10

hysteresis

Question 11

The warren motor is operate at —— RPM?

Answer 11

3600

Question 12

The Holtz motor operates at —– rpm.

Answer 12

1200 rmp

Question 13

The output shaft of a stepping motor ———-.

Answer 13

move though a specific angle for each input pulse.

Question 14

The —– can operate on either AC or DC voltage.

Answer 14

universal

Question 15

The universal motor has a wound armature and brushes like an AC motor, as well as an added component.

Answer 15

compensating winging

Question 16

Conductive compensation is accomplished by connecting the compensating winding in —– with the armature.

Answer 16

series

Question 17

in a universal motor, inductive compensation can be used when the motor is connected to ——.

Answer 17

AC only

Question 18

In the universal motor ,setting the brushes to the neutral plane can be done by connecting voltage to the armature, a voltmeter to the series field, and adjusting the brush position for a ——- reading on the voltmeter.

Answer 18

minimum

Question 19

In the universal motor ,setting the brushes to the neutral plane using
compensating winding can be done by connecting voltage to the armature, a voltmeter to the compensating winding, and adjusting the brush position for a ——- reading on the voltmeter.

Answer 19

maximum

Question 20

Split-phase motor operate on the principle of a ——–magnetic field.

Answer 20

pulsating