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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

 440 A.
 40 A.
 400 A.
 44 A.

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Electrical Machines
Series generators are used in which of the following applications?

 Air crafts.
 Used as boosters in dc distribution or transmission.
 Arc welding.
All of these

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Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Series.
  None of them.
  Shunt.
  Compound.

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 changes.
 different.
 none of above.
 same.

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Electrical Machines
Synchronous reactance of an alternator represents

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

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 440 A.
 250 A.
 340 A.
 570 A.

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