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Electrical Machines

Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 speed regulation.
 starting torque.
 running torque.
 efficiency.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 400 V.
 200 V.
 800 V.
 100 V.

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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

  1.
 0.8.
 0.4.
 0.6.

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Electrical Machines
What is the function of inter pole in DC generator?

 To get a superior commutation.
 To serve the economical aspects.
 To neutralize the distortion of main field flux due to armature reaction.
  Both option B and C.

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Electrical Machines
Universal motor have which of the following application?

  Domestic pump.
  Lift.
  Food mixer.
  Traction.

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  220 V.
  zero.
  about 2 V.
  about 50 V.

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MORE MCQ ON Electrical Machines

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