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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sinδ
 cosδ
 cos2δ
 sin2δ

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Electrical Machines
In DC generator, the electricity produced in armature is

  armature is not present in DC generator.
  AC.
None of these
  DC.

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 (1/2)Fmax.
 3Fmax.
 Fmax.
  (3/2)Fmax.

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 zero speed
 1500 rpm
 1000 rpm
 750rpm

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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 DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Series Motor
 DC Shunt Motor
 Separately Excited DC Motor
 Compound Wound DC Motor

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