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Electrical Machines

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?

 2000W
 1920W
 1820W
 1450W

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Power factor and field current.
 Armature current and torque.
  Armature current and field current.
 Torque and field current.

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Electrical Machines
Conservator tank is used

 to act as an oil storage.
None of these
 for better cooling of transformer.
 to take up the expansion of oil due to temperature rise.

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Electrical Machines
Scott connections are used for

 any of the above.
 three phase to single phase transformation.
 three phase to two phase transformation.
 single phase to three phase transformation.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 less than
 greater than
 any of the above
 equal to

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 per unit impedance
 leakage reactance
 ratings
 efficiency

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