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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 zero
 30 rpm
 1470 rpm
 1500 rpm

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

 Depends on other factor.
 Reduce by 5%.
  Increase by 5%.
 Remain unchanged.

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant voltage control
 constant torque control
 constant power control
 constant current control

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

None of these
  reactance voltage induced in the coil.
  coil resistance.
 armature emf.

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Electrical Machines
In DC generators brushes are used for

 collecting of voltage
 reduce eddy current loss
 collecting of current without any sparkings
 convert ac armature current in to dc

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Electrical Machines
Total core loss is also called as -------------?

 Copper loss
 Magnetic loss
 Hysteresis loss
 Eddy current loss

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