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Electrical Machines

Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BRY
All of these
 BYR
 RBY

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 2, 3, 4
 1, 2, 5
 1, 3, 5
 1, 2, 3, 4

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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

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

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Electrical Machines
The overall power factor of an on load transformer

 is always lagging.
 is always unity.
  depends on the power factor of the load.
 is always leading.

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

 80W
 60W
 40W
 100W

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum power.
 no voltage.
 maximum current.
 maximum voltage.

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