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Electrical Machines

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

 90°
 70° to 85°
 25° to 30°
 0°

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 decrease
 remain nearly constant
 increase to rated voltage and then may decrease
 increase gradually and then stay at rated voltage

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Remain unaltered.
 Reduce.
 Increase.
 Oscillate around the normal speed.

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Electrical Machines
On what factors the speed of dc motor depends?

 Armature current Ia.
 Applied voltage.
 Field flux.
 All of these.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 30000 - 100000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.

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

 Series motors.
 Shunt motors.
 Both B and C.
 Differential compound motors.

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