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Electrical Machines

Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1000 rpm
 3000 rpm
 1500 rpm
 750 rpm

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 250 A.
 570 A.
 460 A.
 340 A.

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Electrical Machines
To avoid formation of grooves in the commutator

  brush position has no effect on the commutator grooving.
 the brushes of same polarity should track each other.
  the brushes of opposite polarity should track each other.
None of these

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

  copper losses.
 core loses only.
 hysteresis loss.
 eddy current loss.

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Electrical Machines
Capacitor in split phase induction motor is used to

 improve the power factor.
 improve the starting torque.
 reduce the harmonics.
 start the motor.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and over excited
 heavily loaded and underexcited
 heavily loaded and over excited
 lightly loaded and underecited

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