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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 1.644 KW.
 0.9103 KW.
  2.73 KW.
 5.46 KW.

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 25 ppm.
  35 ppm.
 20 ppm.
 45 ppm.

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

 Shaded pole motor.
 Split phase motor.
  PSC (permanent split capacitor) motor.
None of these

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 25 W.
 30 W.
 36 W.
 28 W.

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 Proportional to the square of armature current.
 None of above.
 Inversely proportional to the armature current.
 Proportional to the armature current.

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  lighter in weight.
  easy to cast owing to its low melting point and is easily available.
  of low resistivity.
  cheaper in cost.

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