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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

 low resistivity.
  low viscosity.
 low BDV.
 high viscosity.

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Electrical Machines
Which of the following motor has negative speed regulation?

 Series motor
 Shunt motor
 Cumulative compound motors
 Differential compound motor

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2 + Iμ.
 I1 = KI2 + Iw.
 I1 = KI2.
  I1 = KI2 + Iw + Iμ.ok

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

 Star side leads by 30°.
  Delta side lags by -30°.
 Delta side leads by 30°.
 Star side lags by -30°.

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Electrical Machines
Which of the following generators are used in arc welding?

 cumulative compound generators
 series generators
 differential compound generators
 shunt generators

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Electrical Machines
Armature resistance control method is used for the _______ ?

 both 1 and 2
 below rated speed
 above rated speed
None of these

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