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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 5 Hz
 0 Hz
 50 Hz
 1 Hz

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 230 V.
  222 V.
 225 V.
 220 V.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 any of the above
 greater than
 equal to
 less than

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 20 volts.
 10 volts.
 40 volts.
 30 volts.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 95%
 96%
 92%
 94%

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

  Full load current.
 Starting torque, operating speed, full load current.
 Operating speed.
 Starting torque.

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