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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 1000 rpm
 2000 rpm
 500 rpm
 250 rpm

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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
 none of above
 both A and B
 shunt field

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 100 V.
 50 V.
 399 V.
  230.2 V.

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Electrical Machines
Which of the following induction motor has maximum speed?

  2 pole.
 6 pole.
 4 pole.
 8 pole.

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Electrical Machines
Which of the following motor has more stability

 cylindrical motor
None of these
 salient pole motor
 both motors has same stability

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Electrical Machines
Secondary winding of an auto transformer is also called

 compensating winding.
 tertiary winding.
 damping winding.
  common winding.

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