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Electrical Machines

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 24
 12
 10
 5

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Semi closed slots.
  None of above.
  Closed slots.
  Open slots.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

  2 KW.
 0.
 10 KW.
 8 KW.

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

None of these
 pulsating and unidirectional
 steady and unidirectional
 oscillating

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Electrical Machines
Iron loss in a transformer mainly occurs in

 iron made tank of transformer.
 steel core in transformer.
 transformer insulating oil.
 winding of transformer.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  high field resistance.
  magnetic inertia.
  high speed.
  residual flux.

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