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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Food mixer.
  Lift.
  Domestic pump.
  Traction.

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 30.
 45.
  270.
 180.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 speed.
 torque.
 current.
 power.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 decrease.
 increase.
 either of these.
None of these

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at normal speed.
 burn.
 not run.
 run at lower speed.

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Electrical Machines
An unexcited single phase synchronous motor is

 repulsion motor.
  universal motor.
 AC series motor.
 reluctance motor.

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