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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

 44 A.
 40 A.
 400 A.
 440 A.

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Electrical Machines
Synchronous reactance of an alternator represents

All of these
 a reactance operating at synchronous speed
 field winding reactance
 armature reactance and leakage reactance

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Decreases.
 None of above.
 Remain unchanged
 Increases.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/3
 1/√5
 1/√2
 2/√5

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Electrical Machines
Wave winding is employed in DC machine of

 high current and low voltage rating.
 high current and low voltage rating.
  low current and high voltage rating.
 low current and low voltage rating.

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 hysteresis loss.
 vibrations.
 eddy electric current loss.
 copper loss.

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