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Electrical Machines

Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  1/Ia.
  Ia.
  √Ia.

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Electrical Machines
Lamination of core are generally made of

 carbon.
 cast iron.
 silicon steel.
 stainless steel.

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

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

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 remain unaltered.
 become execessively high.
 increase.
 decrease.

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Reluctance motors.
  Induction motors.
  Stepper motors.
  Universal motors.

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 9.3 kW, 9.3 kW.
 9.6 kW, 12 kW.
  6.3 kW, 9.3 kW.
 5.7 kW, 8.7 kW.

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