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Electrical Machines

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Equal to 1.
  Low.
  Same as full load.
  High.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.25 p.u
  0.5 p.u
  0.125 p.u
  0.75 p.u

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at full load.
 copper loss at over load.
  copper loss at any load.
 copper loss at half load.

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

  Full load current.
 Full load speed.
 None of these.
 Full load torque.

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

 80.
  18.
 50.
 36.

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

  30 Hz.
  Can be determined.
 20 Hz.
 35 Hz.

ANSWER DOWNLOAD EXAMIANS APP
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