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Transformers

Transformers
The primary winding of a power transformer should always be

switched
fused
shorted
open

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Transformers
When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

48 V
6 V
0.75 V
0 V

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Transformers
The main reason for generation of harmonics in a transformer could be

poor insulation
saturation of core
mechanical vibrations
fluctuating load

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Transformers
Noise level test in a transformer is a

routine test
special test
type test
None of these

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Transformers
How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

0.9 V
900 V
9 V
90 V

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Transformers
A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is

1 V
0.85 V
0 V
1.7 V

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