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Transformers

Transformers
The highest voltage for transmitting electrical power in india is

400 kV
33 kV
66 kV
132 kV

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Transformers
A tap changer is used on a transformer for

Adjustment in primary voltage
None of the listed here
Adjustments in secondary voltage
Adjustment in both primary and secondary

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Transformers
A transformer is an efficient device because it _______

Uses electric coupling
Uses inductive coupling
Is a static device
Uses capacitive coupling

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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?

350
900
210
450

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Transformers
Leakage flux in a transformer occurs because

Transformer is not an efficient device
Iron core has high permeability
Applied voltage is sinusoidal
Air is not a good magnetic insulator

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Transformers
Which of the following parts of a transformer is visible from outside?

Bushings
Secondary winding
Core
Primary winding

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