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Electrical Machines

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?

 40W
 80W
 100W
 60W

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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them

None of these
 in magnetic neutral axis.
 just ahead of magnetic neutral axis.
 just behind the magnetic neutral axis.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.1 Ω
 31.1 Ω
 15.9 Ω
 31.9 Ω

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

None of these
  permanent magnets.
  residual magnetism.
 armature reaction.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 line to line fault.
  line to ground fault.
 3 - phase fault.
 3 - phase to ground fault.

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

 0KVA
 20KVA
 4KVA
 16KVA

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