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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 420 V.
 400 V.
 350 V.
 480 V.

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

 none of above.
 same.
 different.
 changes.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a induction machine.
 rotor of a dc machine.
 stator of a dc machine.
 rotor of an synchronous machine.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.9 lag
 0.2 lead
 0.2 lag

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

  Decrease.
 Remains same.
 Increase.
 None of these.

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum current.
 maximum voltage.
 maximum power.
 no voltage.

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