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Electrical Machines

Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 decrease
 either increase or decrease
 increase
None of these

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 series generators
 shunt generator
 both B and C
 over compound generator

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Electrical Machines
If input of a transformer is square wave the output will be

 square wave.
 sine wave.
  pulsed wave.
 triangular wave.

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Slip.
 Rotor current.
 Running torque.
 Line voltage.

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Electrical Machines
In a synchronous motor electromagnetic power varies

 directly as applied voltage
 inversely as applied voltage
 directly as square of applied voltage
None of these

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Electrical Machines
Which type of motors are preferred in lifts?

 DC series motors.
 DC shunt motors.
None of these
 DC compound motors.

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