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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 0°
 70° to 85°
 25° to 30°

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

 Differntical compound.
 Cummulative compound.
 Series.
  Shunt.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

 1800 Watt.
  980 Watt.
 1920 Watt.
  1960 Watt.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

  same.
 such that actual impedance of all transformers would be same.
 inversely proportional to MVA rating of transformers.
 proportionate to MVA rating of transformers.

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Electrical Machines
The power factor of squirrel cage induction motor is

 both A and B
 low at heavy loads only
 low at rated load only
 low at light loads only

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Electrical Machines
In a synchronous motor electromagnetic power varies

 directly as applied voltage
None of these
 directly as square of applied voltage
 inversely as applied voltage

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