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Electrical Machines

Electrical Machines
Slip exists in

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

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1820W
 2000W
 1920W
 1450W

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 zero watt
 30 W
 less than 30 W
 more than 30 W

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

 0.5 mg of KOH / gm.
  0.3 mg of KOH / gm.
 2 mg of KOH / gm.
  1 mg of KOH / gm.

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Electrical Machines
Eddy current loss will depends on

 Flux density
 Frequency
 Thickness
All of these

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 266.20 N-m.
 can not be determined.
 234.76 N-m.
 133.22 N-m

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