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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

 lubrication.
 cooling.
  both cooling and insulation.
  insulating.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 768 V
 192 V
 384 V
 96 V

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Electrical Machines
Tap changer is generally provided in

  power transformer.
 current transformer.
 voltage transformer.
 earthing transformer.

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Both of above.
 None of these.
 Heavy sparking at the first stud of starting resistance steps.
 Heavy sparking at brushes.

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to twice of applied voltage.
 none of above.
 back emf is equal to half of applied voltage.
 back emf is equal to applied voltage.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 reactance voltage produced due to communication.
 the use of compensating winding.
  the use equalizer in lap winding.
 the use drum winding.

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