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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/S
 1-S
 1/(1-S)
 S

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 271.7 V.
  256.4 V.
 240 V.
 238.2 V.

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

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

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 voltage but not the torque
 both the torque and voltage
 neither the voltage nor the torque
 torque but not the voltage

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 0KVA
 4KVA
 20KVA
 16KVA

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Electrical Machines
A generator may loose residual magnetism due to

  heating.
  any of these.
  vibrations.
  over excitation.

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