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Electrical Machines

Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 90°
 0°
 Greater than 90°
 less than 90°

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Electrical Machines
Which machine is used for battery charging?

 None of these.
 Compounded DC generator.
 DC shunt generator.
 DC series generator.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imin.
 Vmin to Imax.
 Vmax to Imax.
 Vmax to Imin.

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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 50 MW generator in a power plant.
  Hermetically sealed motor of refrigerator.
 Fractional horse power high speed motor.
 Fractional horse power slow speed motor.

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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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Electrical Machines
Which of the following rotor requires damper winding?

None of these
 Both type rotor.
 Salient pole rotor.
 Cylindrical rotor.

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MORE MCQ ON Electrical Machines

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