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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 180o.
 90o.
 dependent upon the load.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Cross magnetization
None of these
 Magnetization
 Demagnetization

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Electrical Machines
Which of the following pairs is/are correct?

 closed slot----- leakage flux is high
 open slot----- leakage flux is less
 semi closed slot-----leakage flux is moderate
All of these

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 11.5 A.
  13.5 A.
 23 A.
 27 A.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Synchronous motors.
  Universal motor.
  Reluctance motor.
  Slip ring induction motor.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 armature circuit
 shunt field
 none of above
 both A and B

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