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Transformers

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

6 V
0.75 V
48 V
0 V

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Transformers
A no-load test is performed on a transformer to determine

magnetising current and loss
magnetising current
core loss
copper loss
efficiency

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

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

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Transformers
The amount of copper in the primary is _______that of secondary.

About the same as
Smaller than
None of the listed here
Greater than

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Transformers
A transformer will work on

Ac only
AC as well as DC
Dc only
None of the listed here

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Transformers
The path of the magnetic flux in transformer should have

high reluctance
low reactance
high resistance
low resistance

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