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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
A transformer will have zero efficiency at

Full load
None of the listed here
Half full load
No load

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Transformers
Power transformers are generally designed to have maximum efficiency around

no-load
near full-load
half-load
10% overload

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Transformers
A tap changer is used on a transformer for

Adjustment in primary voltage
None of the listed here
Adjustments in secondary voltage
Adjustment in both primary and secondary

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Transformers
The temperature rise of transformer is directly proportional to _______

Apparent power
Leakage reactance
None of the listed here
Reactive power

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Transformers
Which motor is preferred for use in mines where explosive gases exist?

Air motor
Shunt motor
Synchronous motor
Induction motor

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