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Electrical Machines

Electrical Machines
Diverters are used only in

None of these
 either of these
 shunt motors
 series motors

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 0.96
 0.95
 0.87
 1.06

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 27.73 Nm .
 74 Nm.
  65.8 Nm.
 38.5 Nm.

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  high speed motor.
  low horse power motor.
  high torque motor.
  single phase induction motor.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 8
 2
 4
 1

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Electrical Machines
Use of fractional pitch winding

  make it stiffer.
All of these
  results in reduced leakage reactance.
  results in reduced axial length of the machine.

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