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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 40 A.
 440 A.
 44 A.
 400 A.

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  shunt connected.
  separately excited.
 differentially compounded.
  cumulatively compounded.

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 25 kW.
 23.06 kW.
 24.11 kW.
 26.21 kW.

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  zero.
  about 2 V.
  220 V.
  about 50 V.

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Both Compensating and Commutating pole winding.
 Auxiliary winding.
 Commutating pole winding.
 Compensating winding.

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Electrical Machines
Tertiary winding in a transformer is mostly

 star connected.
 zig - zag delta connected.
 zig - zag star connected.
  delta connected.

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MORE MCQ ON Electrical Machines

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