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Electrical Machines

Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 72°
 18°
 30°
 36°

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

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

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/√3, 1/√3
 1/√3, 1/3
 1/3, 1/√3
 1/3, 1/3

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 44 A.
 400 A.
 40 A.
 440 A.

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Electrical Machines
If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by

 (Pi / Pc)2 × full Load.
 (Pi / Pc)1.6 × full Load.
  (Pi / Pc)0.5 × Full Load.
 (Pi / Pc) × full Load.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

All of these
 In case of any sparking they will be less damaged than copper brushes
 They are not hard as copper brush
 They are self lubricating in nature

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