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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f1.5.
 f2.
 f3.
  f.

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Electrical Machines
Armature of DC machine is made of

 conducting material.
 non-ferrous material.
 insulating material.
 silicon steel.

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

  40 A.
 440 A.
 44 A.
 400 A.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave
 full wave controlled
 full wave
 half wave controlled

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K
 R1 /K²
 K²R1
 K×R1

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase to ground fault.
  line to ground fault.
 line to line fault.
 3 - phase fault.

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