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Transformers

Transformers
The mutual inductance when k = 0.65, L1 = 2 H, and L2 = 5 H is

4 μH
2 μH
2 mH
8 μH

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Transformers
A transformer has full load copper loss of 400 W. The copper loss at half full load will be _____.

None of the listed here
400 W
200 W
100 W

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Transformers
Short circuit test of a transformer helps us to find its

None of the listed here
Cu loss at no load
Full load cu loss
Iron loss

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Transformers
Cores of large transformers are built upto nearly circular cross section in order to reduce

Leakage reactance
Iron losses
Copper loss
Eddy current loss

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Transformers
The core type transformer provides _______

None of the listed here
Shorter magnetic path
Lesser average length per turn
Much longer magnetic path

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Transformers
The mutual flux in a transformer remains constant at all loads because ______

Applied voltage and frequency are constant
Losses are small
Iron core is used
Leakage flux is small

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