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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 DC compound.
 Induction motor.
  DC series.
 DC shunt.

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Electrical Machines
The stator core of a 3 - Φ induction motor is laminated in order to reduce the

  eddy current loss.
  hysteresis loss.
  weight of the stator.
  both of the above.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 flat-topped
 sinusoidal
 rectangular
 co- sinusoidal

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 0.1 Ω
 10 Ω
 50 Ω
 100 Ω

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Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

  1, 2 and 3.
 2 and 4.
 1, 3 and 4.
 2, 3 and 4.

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Closed slot type machines.
 Any of the above.
 Open slot type machines.
 Semi closed slot type machine.

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