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Transformers

Transformers
Noise level test in a transformer is a

None of these
type test
routine test
special test

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Transformers
Negative voltage regulation is indicative that the load is

None of these
capacitive only
inductive only
inductive or resistive

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Transformers
The power transformer is a constant

Power device
Main flux device
Current device
Voltage device

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Transformers
Which of the following acts as a protection against high voltage surges due to lightning and switching?

Breather
Conservator
Horn gaps
Thermal overload relays

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Transformers
Natural oil cooling is used for transformers up to a rating of

250 kVA
3000 kVA
500 kVA
1000 kVA

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Transformers
The dielectric strength of transformer oil is expected to be

330 kV
100 kV
33 kV
lkV

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