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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

 2000 rpm
 250 rpm
 1000 rpm
 500 rpm

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  statically induced voltage.
  reactance voltage.
None of these
  dynamically induced voltage.

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Electrical Machines
Which type motors are preferred for lathes?

 Squirrel Cage induction motor.
 DC shunt motors.
 Either A or B.
 Synchronous motor.

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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?

 1500 rpm
 1470 rpm
 zero
 30 rpm

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Electrical Machines
At stand still condition the value of slip is

 1
 finite value
 0
 infinite value

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 30°.
 24°.
  10°.
 45°.

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