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Electrical Machines

Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  720 to 920.
  1440 to 2880.
  500 to 720.

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 3/4.
 9/16.
 16/9.
 4/3.

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 220 V
 more than 220 V
 somewhat less than 220 V
 6 V

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Electrical Machines
Generators work on the principle of production of

None of these
 dynamically induced emf.
 dynamically and statically induced emf.
 statically induced emf.

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Electrical Machines
Hunting in a synchronous motor takes place

  when supply voltage fluctuates.
  when load varies.
  when power factor is unity.
  motor is under loaded.

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 commutation.
 electromechanical energy conversion.
 generation of voltage.
 development of torque.

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MORE MCQ ON Electrical Machines

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