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TRANSFORMERS

Transformers
The dielectric strength of transformer oil is expected to be

330 kV
lkV
33 kV
100 kV

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Transformers
Losses which occur in rotating electric machines and do not occur in trans formers are

friction and windage losses
hysteresis and eddy current losses
magnetic losses
copper losses

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Transformers
Which of the following is the main advantage of an auto-transformer over a two winding transformer?

Hysteresis losses are reduced
Eddy losses are totally eliminated
Saving in winding material
Copper losses are negligible

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Transformers
Primary winding of a transformer

is always a high voltage winding
could either be a low voltage or high voltage winding
None of these
is always a low voltage winding

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Transformers
Negative voltage regulation is indicative that the load is

None of these
inductive or resistive
capacitive only
inductive only

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