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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 copper loss
 mechanical loss
 iron loss
 both A and B

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

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

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 1000 rpm, - 50 rpm.
 1000 rpm, 950 rpm.
 zero, 950 rpm.
 zero , - 50 rpm.

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has a almost constant speed.
 Can be started easily without load.
 Has a poor torque.
 Has its field winding consinting of thick wire and less no of turns.

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

  proportional to rotor speed.
 proportional to square of rotor speed.
 zero.
 constant independent of speed.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Armature voltage control.
 Field control.
 Field diverter control.
 Armature resistance control.

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