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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  voltage.
 speed.
  load.
  speed and voltage.

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 more than 6 V
 less than 6 V
 zero
 6 V

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

 Olefin based insulating oil.
  Paraffin based insulating oil.
 Aromatics based insulating oil.
 Naphtha based insulating oil.

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Electrical Machines
In a synchronous motor electromagnetic power varies

None of these
 inversely as applied voltage
 directly as applied voltage
 directly as square of applied voltage

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Electrical Machines
The use of higher flux density in the transformer design

 has no relation with the weight of transformer
 reduces the weigh per KVA
None of these
 increases the weigh per KVA

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The torque required.
 The voltage across the terminals.
 The speed of motor.
 None of above.

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