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Electrical Machines

Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 150Hz.
 50Hz.
 100Hz.
 200Hz.

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Electrical Machines
Voltage regulation can be determined by which of the following?

 ZPF method.
 MMf method.
 Synchronous impedance method.
All of these

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

 1-S
 S
 1/(1-S)
 1/S

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Electrical Machines
In which of the following motors DC excitation is not required?

 3-phase synchronous generator
 3-phase synchronous motor
 hysteresis motor
 reluctance motor

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Stepper motors.
  Induction motors.
  Reluctance motors.
  Universal motors.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 more than 30 W
 30 W
 zero watt
 less than 30 W

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