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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 72
 37
 74
 36

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Electrical Machines
In case of IM the torque is

  inversely proportional to √slip.
  directly proportional to slip.
  directly proportional to slip2.
  inversely proportional to slip.

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Electrical Machines
Stray losses in transformer occurs in

 paper insulation in transformers.
 transformer insulating oil.
 steel core.
  winding conductors and steel structures of transformer.

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Electrical Machines
A DC generator can be considered as

 prime mover.
 rotating amplifier.
 power pump.
 rectifier.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thin
 large and thick
 less and thick
 large and thin

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/√3
 1/√3, 1/3
 1/√3, 1/√3
 1/3, 1/3

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