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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 200 - 250 W.
  50 - 150 W.
 10 - 20 W.
 250 - 500 W.

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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
 Vt = Ea + Iara+ ILrs

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Wave winding.
 Both wave and lap winding.
 Lap winding.
 No wave and lap winding.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 570 A.
 440 A.
 250 A.
 340 A.

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 0.5Ω.
 1Ω.
  0.23Ω.
 0.25Ω.

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Electrical Machines
Slip exists in

  in both machines.
  synchronous motor.
  induction motor.
  none of above.

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