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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

None of these
 AC.
 both of above.
 DC.

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 less than 90°
 Greater than 90°
 90°
 0°

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  the rotating stator flux and rotor flux.
  magnetizing electric current and back emf.
None of these
  the supply voltage and the back emf.

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 35°C.
 27°C.
  45°C.
 32°C.

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant power control
 constant torque control
 constant voltage control
 constant current control

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 AC single phase motor.
 DC Shunt Motor
 Synchronous motor.
 Induction motor.

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