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Electrical Machines

Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 5 - 10 F.
  2 - 3 µF.
  1 - 2 µF.
 0.1 µF.

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Electrical Machines
The primary and secondary windings of a transformer are

 electrically linked.
  inductively linked.
  conductively linked.
 mechanically linked.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Periodic variation of load.
  Small and constant load.
  Over-excitation.
  Over-loading for long period.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 83.33 KVA
 50 KVA
 100 KVA
 123.3 KVA

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  semi closed or semi opened.
  always closed.
  none.
  always opened.

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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

 2, 4, 5, 6
 3, 4, 5
 2, 3, 6
 1, 2, 5

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