Motors Book - Chapter 8
15 Questions
| Total Attempts: 275
Questions and Answers
- 1.In many cases, a single-phase motor is constructed with both a start and a ___ winding in the stator.
- A.
Run
- B.
Stop
- C.
Shut-down
- D.
None of the above
- 2.___ is the lack of rotation when the stator's field and the rotor's field are parallel to one another.
- A.
Parallel rotation
- B.
Overload rating
- C.
Non-adjustable-trip
- D.
Locked in step
- 3.Shaded-pole motors are commonly ___ HP or less and have low starting torque.
- A.
1/20
- B.
1/2
- C.
10
- D.
100
- 4.The function of the ___ is to delay the magnetic flux in the area of the pole that is shaded.
- A.
Salient pole
- B.
Three-pole rheostat
- C.
Shaded pole
- D.
Pole-face windings
- 5.___ control of shaded-pole motors is accomplished by adding windings in series with the main winding.
- A.
Reverse speed
- B.
Speed
- C.
Magnetic
- D.
Electromagnetic
- 6.___ is the opposition to the flow of AC in a circuit due to inductance.
- A.
Flux density
- B.
Inductive reactance
- C.
Hysteresis
- D.
Magnetic flux
- 7.When the motor reaches approximately ___% of full speed, the centrifugal switch opens, disconnecting the start winding from the circuit.
- A.
15
- B.
45
- C.
75
- D.
95
- 8.The speed at which a split-phase motor runs is determined by the number of ___ in the motor and the frequency of the supply voltage.
- A.
Poles
- B.
Windings
- C.
Rotors
- D.
Brushes
- 9.A ___ motor is a single-phase motor with a capacitor connected in series with the start windings to produce phase displacement in the start winding.
- A.
Wound-rotor
- B.
Series
- C.
Design
- D.
Capacitor
- 10.A ___ motor has one-capacitor in series with the start winding and one capacitor in series with the run windings.
- A.
Capacitor-run
- B.
Capacitor start-and-run
- C.
Shunt
- D.
Single-phase
- 11.A ___ motor is commonly wound to run on either six or eight poles.
- A.
Multispeed, single-phase
- B.
Single-speed, split-phase
- C.
Two-speed, split-phase
- D.
Multispeed, three-phase
- 12.A capacitor-start motor operates much the same as a split-phase motor, in that it uses a centrifugal switch that opens at approximately ___% to ___% of full-load speed.
- A.
20; 40
- B.
40; 60
- C.
60; 80
- D.
80; 100
- 13.For a shaded-pole motor, the stator has two or more ___ poles that are divided into parts.
- A.
Salient
- B.
Shaded
- C.
Rotor
- D.
Magnetic
- 14.In a capacitor-run motor the addition of a second ___ creates a three-speed version of the motor.
- A.
Soft starter
- B.
Plug fuse
- C.
Brush
- D.
Auxiliary winding
- 15.Capacitor start-and-run motors are typically used to run ___ and ___.
- A.
Fans; blowers
- B.
Refrigerators; air compressors
- C.
Air conditioners; power tools
- D.
All of the above