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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 50 Hz
 5 Hz
 0 Hz
 1 Hz

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% increase
 36.36% decrease
 36.36% increase
 18.18% increase

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Electrical Machines
Which of the following motors is/are widely used?

None of these
 either of these
 squirrel cage induction motor
 slip ring induction motor

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase in reliability
All of these
 Increase efficiency under light load conditions
 continuity supply is maintained

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 768 V
 96 V
 192 V
 384 V

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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

  None of these.
 A resistor.
 an inductor.
 A capacitor.

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