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Electrical Machines

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

 1/(1-S)
 1/S
 1-S
 S

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

  0.54 Ω.
 0.54 Ω.
 0.06 Ω.
 0.01 Ω.

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Electrical Machines
The armature shaft must be able to with stand

 Twisting stains due to transmission of torque.
All of these
 Bending moment due to weight of the armature.
 Any unbalanced magnetic pull on the armature core.

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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are

 1 , 3, 5
 2, 3, 5
 1, 4,5
 2, 4, 5

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = 2/P*ωm
 ωe = ωm
 ωe = P/2*ωm
 ωe = P*ωm

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 112.5 W
 168.75 W
 75 W
 50 W

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