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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  none of these.
  P and Z.
  P.
  Z.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase to rated voltage and then may decrease
 remain nearly constant
 decrease
 increase gradually and then stay at rated voltage

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 2 to 3 commutator segment.
 the width more than 3 commutator segment.
 the width of the 1 to 2 commutator segment.
 less than the width of commutator segment.

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 2KW
 0.5Kw
 1.5KW
 3KW

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Electrical Machines
The output power of any electrical motor is taken from the

 Armature.
 Field.
 Motor frame.
 Coupling mounted on the shaft.

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Electrical Machines
The wattage rating of a ceiling fan motor will be

 200 - 250 W.
  50 - 150 W.
 250 - 500 W.
 10 - 20 W.

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MORE MCQ ON Electrical Machines

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