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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is
110 VA
550 VA
500 VA
100 VA
110 VA
550 VA
500 VA
100 VA
Answer
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Related Question
Electrical Machines
An induction motor is, in general analogous to
two winding transformer with secondary open circuited.
None of these
two winding transformer with secondary short circuited.
auto transformer.
two winding transformer with secondary open circuited.
None of these
two winding transformer with secondary short circuited.
auto transformer.
Answer
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Electrical Machines
A short circuit test on a transformer gives
copper loss at half load.
copper loss at over load.
copper loss at full load.
copper loss at any load.
copper loss at half load.
copper loss at over load.
copper loss at full load.
copper loss at any load.
Answer
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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be
no resistance is connected.
series.
any one of the connection.
parallel.
no resistance is connected.
series.
any one of the connection.
parallel.
Answer
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Electrical Machines
In alternator, the rotary part is
none of these.
core.
armature.
magnetic field poles.
none of these.
core.
armature.
magnetic field poles.
Answer
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Electrical Machines
Compensating windings are used in DC generators
to provide path for the circulation of cooling air.
to neutralize the cross magnetizing effect of the armature reaction.
None of these
mainly to reduce the eddy currents by providing local short circuit.
to provide path for the circulation of cooling air.
to neutralize the cross magnetizing effect of the armature reaction.
None of these
mainly to reduce the eddy currents by providing local short circuit.
Answer
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