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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 45°
 10°
 60°
 30°

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Electrical Machines
In a synchronous motor electromagnetic power varies

None of these
 directly as square of applied voltage
 directly as applied voltage
 inversely as applied voltage

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use of compensating winding.
  the use equalizer in lap winding.
 reactance voltage produced due to communication.
 the use drum winding.

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Electrical Machines
Maximum power developed depends on

 voltage
 both 1and 2
 reactance
 load angle

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 30 rpm
 1500 rpm
 zero
 1470 rpm

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 2000.
 1000.
 0.
 500.

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MORE MCQ ON Electrical Machines

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