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Electrical Machines

Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V
 V²
 supply voltage V
 1/V²

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  always closed.
  none.
  always opened.
  semi closed or semi opened.

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature and field both are connected.
 Armature and field both are parallel.
  Armature and field both are in series with the load.
 Armature winding is in series with load.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Eg vs load current
 Vt vs load current
 Eg vs Ia
 Vt vs Ia

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Electrical Machines
The functions of inter poles are

 both 1 and 2
 reduce cross magnetization effect and improve commutation
 nullify reactance voltage and improve the commutation.
None of these

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Eddy current losses
 All of the them
 Hysteresis losses
 Friction and windage losses

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