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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.
  1.0.
  0.05.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 Separately Excited DC Motor
 DC Series Motor
 DC Shunt Motor
 Compound Wound DC Motor

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Electrical Machines
Regenerative braking is not found in which motor?

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

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

None of these
 remains constant.
 decrease.
 increase.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 synchronous speed.
 normal speed.
 slip speed.
 any of the above.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 supply voltage control
All of these
 armature circuit resistance control
 field current control

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