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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

0 V
48 V
0.75 V
6 V

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Transformers
An isolation transformer has primary to secondady turns ratio of

2:1
1:1
1:2
Can be any ratio

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Transformers
The no load ratio of a 50 Hz single phase transformer is 6000/250 V. The maximum flux in the core is 0.06 Wb. What is the number of primary turns?

450
350
210
900

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Transformers
In a transformer the energy is conveyed from primary to secondary

through cooling coil
None of these
by the flux
through air

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Transformers
Losses which occur in rotating electric machines and do not occur in trans formers are

copper losses
magnetic losses
friction and windage losses
hysteresis and eddy current losses

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Transformers
In which of the following transformer part of primary winding also serves as the secondary winding?

Auto transformer
Potential transformer
Step-up transformer
Current transformer

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