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Transformers

Transformers
A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

0.4
5
0.2
25

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Transformers
An ideal transformer is one which _______

None of the listed here
Has no losses and leakage reactance
Does not work
Has same number of primary and secondary turns

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Transformers
The primary winding of a power transformer should always be

open
shorted
switched
fused

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Transformers
In an auto transformer, the primary and secondary are _____ coupled.

Magnetically as well as electrically
Only magnetically
None of the listed here
Only electrically

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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

0 V
1.7 V
1 V
0.85 V

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Transformers
Material used for construction of transformer core is usually

Copper
Aluminium
Wood
Silicon steel

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