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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

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

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Electrical Machines
Which of the following motor has more stability

 both motors has same stability
None of these
 salient pole motor
 cylindrical motor

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  transformer with secondary short circuited.
  capacitor start induction motor.
  synchronous motor.
  repulsion start induction motor.

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 0 V
 2 V
 1 V
 4 V

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its speed will reduce
 its power factor will reduce
 its speed will increase
 its efficiency will improve

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Electrical Machines
The output voltage of a DC generator is

 E = V – IaRa.
 E = V + Ra.
 E = V + Ia.
  E = V + IaRa.

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