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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 40%
 5%
 19%
 10%

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 provide execessive voltage drop in line.
 all of above.
 draw a starting current many times its rated full load current.
 damage the armature and commutator.

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Electrical Machines
The condition for maximum running torque is

 0.5 lagging
 zero
 R = S.X
 unity
 0.707 lagging

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V
 V²
 f
 f²

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 Greater than 90o.
 0o.
 less than 90o.
 90o.

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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

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

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