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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
 74
 72
 37

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at rated load only
 low at heavy loads only
 both A and B
 low at light loads only

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

All of these
 supply voltage and field current at constant excitation
 power factor and dc excitation at constant load
 power factor and supply voltage during hunting

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 0.08
 -0.08
 1.92
 -1.92

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/√5
 2/√5
 1/3
 1/√2

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  wound.
  linear.
  cage.
  none of these.

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