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Electrical Machines

Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 35°C.
 32°C.
  45°C.
 27°C.

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Electrical Machines
Exciting current of an induction motor is

  higher than power transformer.
  none of these.
  equal as power transformer.
  lesser than power transformer.

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

None of these
 I1 < I2
 I1 > I2
 I1 = I2

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Electrical Machines
The reduced air gap results in an increase

  cost of operation.
  starting torque.
  breaking torque.
  power factor.

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

 proportional to square of rotor speed.
 zero.
  proportional to rotor speed.
 constant independent of speed.

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Electrical Machines
Belt conveyors offer _______________ starting torque.

  low.
  zero.
  high.
  medium.

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