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Electrical Machines

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

 44 A.
  40 A.
 400 A.
 440 A.

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

 changes.
 same.
 different.
 none of above.

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Electrical Machines
Synchronous reactance of an alternator represents

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

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/S
 1/(1-S)
 1-S
 S

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 25 W.
 28 W.
 30 W.
 36 W.

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 25 Hz
 40 HZ
 50 Hz
 60 Hz

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