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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 unity
 zero
 lagging
 leading

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

  12.
 4.
 3.
 7.

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Electrical Machines
In case of IM the torque is

  inversely proportional to √slip.
  inversely proportional to slip.
  directly proportional to slip.
  directly proportional to slip2.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

  vibrations.
  heating of rotor.
  double frequency currents in the rotor.
All of these

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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

 0.6.
  1.
 0.8.
 0.4.

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Electrical Machines
Flux density under trailing pole tips in case of generator will

 increase
 either increase or decrease
None of these
 decrease

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MORE MCQ ON Electrical Machines

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