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Electrical Machines

Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 50Hz.
 150Hz.
 200Hz.
 100Hz.

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

 power factor is less.
  high starting torque.
  less costly motor is not required.
  low starting torque.

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

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

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Electrical Machines
Damper winding is used to

 suppress the hunting.
 increase the load current.
 decrease the load current.
 both 1 and 2.

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Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 copper loss
 both 1and 2
 hysteresis loss

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

All of these
 armature current
 armature flux
 armature mmf

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MORE MCQ ON Electrical Machines

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