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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 50 Hz
 0 Hz
 100 Hz

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Electrical Machines
The no load current in a transformer lags the applied voltage by

  about 75°.
 90°.
 about 115°.
 0°.

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1820W
 1920W
 1450W
 2000W

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

 200.
 750.
  100.
 500.

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 increase
 remain the same
 decrease
 become zero

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 110 VA
 500 VA
 100 VA
 550 VA

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