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Transformers

Transformers
Power transformers are generally designed to have maximum efficiency around

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

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Transformers
The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?

88 V
8,800 V
8.8 V
880 V

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Transformers
Which of the following is not a fitting on a transformer?

Buchholz's relay
Breather
Conservator
Commutator

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Transformers
In a transformer routine efficiency depends upon

Supply frequency
Load current
Power factor of load
Both power factor and load current

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Transformers
The iron core is used to ______of the transformer.

Reduce core loss
Provide tight magnetic coupling
None of the listed here
Increase the wight

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Transformers
The maximum load that a power transformer can carry is limited by its

voltage ratio
dielectric strength of oil
temperature rise
copper loss

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