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Electrical Machines

Electrical Machines
If a DC motor is connected across the AC supply it will

 Run at normal speed.
 Run at lower speed.
 Not run.
  Burn.

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Electrical Machines
In DC generator, the electricity produced in armature is

  AC.
  DC.
  armature is not present in DC generator.
None of these

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 60 V.
 0 V.
 20 V.
  40 V.

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 600 W
 700 W
 650 W
 625 W

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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

 A capacitor.
 A resistor.
 an inductor.
  None of these.

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  the rotating stator flux and rotor flux.
None of these
  the supply voltage and the back emf.
  magnetizing electric current and back emf.

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MORE MCQ ON Electrical Machines

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