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Electrical Machines

Electrical Machines
The output voltage of a DC generator is

 E = V – IaRa.
  E = V + IaRa.
 E = V + Ia.
 E = V + Ra.

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  increasing the input to the prime mover.
  increasing the excitation.
 cooling the armature.
  reducing the load voltage.

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Electrical Machines
Lap winding is prefered for which type of machines?

 high current and low voltage
 low current and low voltage
 low current and high voltage
 high current and high voltage

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Electrical Machines
Which of the following rotor requires damper winding?

 Both type rotor.
None of these
 Cylindrical rotor.
 Salient pole rotor.

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Terminal voltage is same
 Speed of alternators should be same
 Both 1and 2
 Frequency should be same

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Electrical Machines
Select the motor that should not be started on no load?

 Compound motor.
  Series motor.
 Brushless DC motor.
 Shunt motor.

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MORE MCQ ON Electrical Machines

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