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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 36
 72
 74
 37

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

  to a DC source.
 to an AC source.
 to earth.
 in reverse.

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BYR
 BRY
All of these
 RBY

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 168.75 W
 112.5 W
 75 W
 50 W

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

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Electrical Machines
In which of the following motors DC excitation is not required?

 reluctance motor
 3-phase synchronous generator
 hysteresis motor
 3-phase synchronous motor

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