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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 0 Hz
 25 Hz
 50 Hz
 100 Hz

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Electrical Machines
If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by

 (Pi / Pc) × full Load.
 (Pi / Pc)1.6 × full Load.
 (Pi / Pc)2 × full Load.
  (Pi / Pc)0.5 × Full Load.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 DC Shunt Motor
 Induction motor.
 AC single phase motor.
 Synchronous motor.

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  overheating of winding.
  overload.
  uneven air gap.
  poor lubrication.

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Electrical Machines
Breather is provided in a transformer to

  absorb moisture of air during breathing.
 filter the transformer oil.
 provide cold air in transformer.
 absorb moisture from air entering in transformer.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 synchronous speed.
 normal speed.
 slip speed.
 any of the above.

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