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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 cross magnetization
 magnetization
 demagnetization

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Electrical Machines
In a DC compound motor the field regulator is provided to

 demagnetize the field partially.
 control the armature flux.
 control the field flux.
 limit the armature current.

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Electrical Machines
Which of the following motors has negative speed regulation?

 Series motors.
 Both B and C.
 Shunt motors.
 Differential compound motors.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase fault.
 3 - phase to ground fault.
  line to ground fault.
 line to line fault.

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Increase.
  Reduce.
  Oscillate around the normal speed.
  Remain unaltered.

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.8.
 0.4.
  1.
 0.6.

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