Deck 34: Single-Phase Motors

Question 1

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

Answer 1

A

Question 2

A two-phase power system has two voltages that are

A) 60°
B) 90°
C) 180°
D) 360°

Answer 2

B

Question 3

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

Answer 3

B

Question 4

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

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

Question 5

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

Question 6

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

A) high
B) low

Question 7

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

Question 8

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

A) open
B) shorted

Question 9

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 10

The Warren motor operates at RPM.

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

Question 11

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

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

Question 12

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 13

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

A) series
B) parallel

Question 14

The motor can operate on either AC or DC voltage.

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

Question 15

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

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

Question 16

Split-phase motors operate on the principle of a

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

Question 17

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 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 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 20

The Holtz motor operates at RPM.

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

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) capacitor­start capacitor­run motor