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Electrical Machines

Electrical Machines
Which of the following is not a part of transformer?

 Radiator.
 Tap changer.
 Conservator tank.
  Commutator.

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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.
 3.
 7.
 4.

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 neither the voltage nor the torque
 voltage but not the torque
 both the torque and voltage
 torque but not the voltage

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 two.
 infinity.
 zero.
  unity.

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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 50 MW generator in a power plant.
 Fractional horse power high speed motor.
 Fractional horse power slow speed motor.
  Hermetically sealed motor of refrigerator.

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

  increase the speed of shaft rotation.
 increase the number of turns in armature coil.
 increase the source frequency.
 increase the number of turns in field coil.

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