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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 cumulative compound motors
 shunt motors
 both B and C
 series motors

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.125 p.u
  0.5 p.u
  0.25 p.u
  0.75 p.u

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Electrical Machines
If a DC motor is connected across the AC supply it will

 Run at lower speed.
 Not run.
 Run at normal speed.
  Burn.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 differentially compounded motor
 comulatively compounded motor
 permanent magnet motor
 series motor

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Electrical Machines
Capacitor in split phase induction motor is used to

 reduce the harmonics.
 improve the power factor.
 improve the starting torque.
 start the motor.

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 2
 6
 4
 1

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