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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 0 Hz
 1 Hz
 50 Hz
 5 Hz

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Electrical Machines
Sparkless commutation can be achieved by employing

 compensating winding.
  inter poles.
  high resistance carbon brushes.
  any one or more of the above methods.

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Electrical Machines
Which of the following motor has negative speed regulation?

 Series motor
 Shunt motor
 Cumulative compound motors
 Differential compound motor

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea + Iara
 Vt = Ea + Ia(ra + rs)
 Vt = Ea + Iara+ ILrs
 Vt= Ea– Iara

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 unshaded, unshaded
 unshaded, shaded
 shaded, shaded
 shaded, unshaded

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Applied voltage.
 Field flux.
 All of these.
 Armature current.

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