Motors Book - Chapter 6
12 Questions
| Total Attempts: 119
Questions and Answers
- 1.A(n) ___ motor is an induction motor with the squirrel-cage conductor bars replaced with coils of wire, and with added slip rings, brushes, and a resistor circuit.
- A.
Design
- B.
Induction
- C.
Wound-rotor
- D.
Electronic
- 2.A wound-rotor motor can be distinguished from a squirrel-cage induction motor by the presence of the ___.
- A.
Coils of wire in the winding slots instead of the solid conductor bars
- B.
Three slip rings on the shaft
- C.
External resistance bank
- D.
All of the above
- 3.A(n) ___ ring is a metallic ring mounted on a motor shaft and electrically insulated from the shaft.
- A.
Slip
- B.
Conducting
- C.
Shorting
- D.
Induction
- 4.A ___ is an extended, flexible connection or a braided copper conductor.
- A.
Coil winding
- B.
Pigtial
- C.
Eutectic alloy
- D.
Plug fuse
- 5.The ___ carries the entire rotor current.
- A.
Slip ring
- B.
External resistor circuit
- C.
Brush rigging
- D.
Melting-alloy overload relay
- 6.The maximum ___ is produced when the maximum resistance is connected to the rotor and the induced frequency is at its highest.
- A.
Flux
- B.
Current
- C.
Torque
- D.
None of the above
- 7.A wound-rotor motor ___ is a device containing high-wattage resistors that is designed to control the speed of a wound-rotor motor and operate in variable-speed mode for as long as needed.
- A.
Regulator
- B.
Starter
- C.
Resistor
- D.
Drum switch
- 8.A ___ is a type of regulator.
- A.
Drum switch
- B.
Three-pole rheostat
- C.
Silicon-controlled rectifier
- D.
All of the above
- 9.A ___ is switch with tapped resistors used to switch a set of resistors in or out of a wound-rotor circuit.
- A.
Drum switch
- B.
Silicon-controlled rectifier
- C.
Three-pole rheostat
- D.
Wound-rotor motor starter
- 10.A rheostat uses a three-___ to start the wound-rotor motor.
- A.
Wire enclosure
- B.
Wire control circuit
- C.
Pole rheostat
- D.
Pole circuit
- 11.Resistors designed for starting are able to dissipate the ___ generated during the short time required for starting the motor.
- A.
Heat
- B.
Current
- C.
Voltage
- D.
Magnetism
- 12.Increasing the resistance of the rotor while it is ___ reduces the current in the rotor windings and reduces the speed of the motor.
- A.
Starting
- B.
Stopping
- C.
Running
- D.
None of the above
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