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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.5.
  0.1.
  0.05.
  1.0.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both increase
 both decrease
 increase and decrease respectively
 decrease and increase respectively

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Electrical Machines
The slip of an induction motor normally does not depend on

  core loss component.
  shaft torque.
  synchronous speed.
  rotor speed.

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Electrical Machines
Rotor resistance speed control is used in

 synchronous motor.
 squirrel cage induction motor.
 slip ring induction motor.
 dc shunt motor.

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 212 V.
 205 V.
  201.02 V.
 210 V.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  AC slip ring motor.
  Synchronous motor.
  DC series motor.
  Single phase induction motor.

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MORE MCQ ON Electrical Machines

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