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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 both 1and 2
 hysteresis loss
 copper loss

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Electrical Machines
Voltage regulation can be determined by which of the following?

All of these
 ZPF method.
 MMf method.
 Synchronous impedance method.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 10Ω
 200Ω
 50Ω
 100Ω

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

None of these
  Zener diode shunt regulator.
  Transistor shunt regulator.
  Transistor series regulator.

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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?

 BRY
 BYR
All of these
 RBY

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature voltage control.
 Any of above.
 Field resistance control.
 Armature circuit resistance control.

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