Deck 34: Single-Phase Motors

Question 1

In a universal motor, inductive compensation can be used when the motor is connected to _____.

A) AC only
B) DC only
C) either AC or DC

Answer 1

A

Question 2

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

A) open
B) shorted

Answer 2

B

Question 3

In a motor that has a rotating magnetic field, the speed of that magnetic field is referred to as the _____.

A) rotor speed
B) stator speed
C) synchronous speed
D) slip speed

Answer 3

C

Question 4

Split-phase motors operate on the principle of a _____ magnetic field.

A) fixed
B) pulsating
C) vibrating
D) rotating

Question 5

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

A) centrifugal switch
B) disconnect switch
C) operator
D) overload switch

Question 6

In the shaded-pole induction motor, the direction of rotation of the magnetic field is determined by the _____.

A) generator power
B) rotor construction
C) shading coil diameter
D) magnetic field strength

Question 7

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

A) series
B) parallel

Question 8

A two-phase power system has two voltages that are _____ out of phase.

A) 60 °
B) 90 °
C) 180 °
D) 360 °

Question 9

The consequent-pole motor is used where _____ running torque must be maintained at different speeds.

A) high
B) low

Question 10

The _____ winding is made of a few turns of large wire and is located at the bottom of the stator core  of a split-phase motor.

A) start
B) run
C) synchronous
D) disconnect

Question 11

The Holtz motor operates at _____ RPM.

A) 1200
B) 1725
C) 1800
D) 3600

Question 12

The _____ motor can operate on either AC or DC voltage.

A) consequent pole
B) universal
C) shaded pole
D) split-phase

Question 13

The output shaft of a stepping motor _____.

A) moves through a specific angle for each input pulse
B) rotates at a constant speed during each input pulse
C) steps continuously when power is applied
D) rotates continuously when power is applied

Question 14

The _____ winding is made of many turns of small wire and is located at the top of the stator core of a split-phase motor.

A) start
B) run
C) synchronous
D) disconnect

Question 15

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

A) impedance
B) repulsion
C) hysteresis
D) inductive

Question 16

The Warren motor operates at _____ RPM.

A) 1200
B) 1725
C) 1800
D) 3600

Question 17

Multispeed fan motors achieve multiple speeds by inserting additional _____ in series with the run winding.

A) inductance
B) resistors
C) capacitors
D) poles

Question 18

In a 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.

A) minimum
B) maximum

Question 19

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

A) inductive winding
B) compensating winding
C) neutral plane
D) synchronous winding

Question 20

A(n) _____ motor operates on the principle that like magnetic poles repel.

A) impedance
B) hysteresis
C) repulsion
D) inductive

Question 21

What is  a special type of motor designed to operate with the rotor stalled without damage to the motor?

A) servo motor
B) torque motor
C) ​repulsion motor
D) ​capacitor-start capacitor-run motor