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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

 Lathes.
 Blowers and fans.
 Centrifugal pumps
  All of this.

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  overload.
  poor lubrication.
  overheating of winding.
  uneven air gap.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 None of these.
 Increase.
 Remains same.
  Decrease.

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Electrical Machines
Crawling in an induction motor is due to

  slip ring rotor.
  space harmonics produced by winding currents.
  time harmonics in supply.
  insufficient starting torque.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 increase.
 decrease.
None of these
 either of these.

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Electrical Machines
A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is

 14%.
  8.9%.
 7%.
 0%.

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MORE MCQ ON Electrical Machines

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