Transformers Archives

11. The transformer laminations are insulated from each other by

mica strip

thin coat of varnish

paper

any of the above

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12. No-load current of a transformer has

has high magnitude and low power factor

has high magnitude and high power factor

has small magnitude and high power factor

has small magnitude and low power factor

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13. In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are

friction and windage losses

copper losses

hysteresis and eddy current losses

none of the above

Detailed SolutionIn a

given transformer for given applied voltage, losses which remain constant irrespective of load changes are

14. Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in

short-circuiting of the secondaries

power factor of one of the transformers is leading while that of the other lagging

transformers having higher copper losses will have negligible core losses

loading of the transformers not in proportion to their kVA ratings

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class="youtube-subscribe-button"> Subscribe on YouTube are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in" class="read-more button" href="https://exam.pscnotes.com/mcq/two-transformers-are-connected-in-parallel-these-transformers-do-not-have-equal-percentage-impedance-this-is-likely-to-result-in/#more-44621">Detailed Solution

15. Which of the following acts as a protection against high voltage surges due to lightning and switching?

Horn gaps

Thermal overload relays

Breather

Conservator

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to lightning and switching?" class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-acts-as-a-protection-against-high-voltage-surges-due-to-lightning-and-switching/#more-44437">Detailed Solution

16. In a transformer the resistance between its primary and secondary is

zero

1 ohm

1000 ohms

infinite

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

Bushings

Core

Primary winding

Secondary winding

Detailed

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Solution

18. Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds

50Â°C

80Â°C

100Â°C

150Â°C

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19. Primary winding of a transformer

is always a low voltage winding

is always a high voltage winding

none of the above

Detailed SolutionPrimary winding of a transformer

20. The core used in high frequency transformer is usually

copper core

cost iron core

air core

mild steel core

Detailed

Solution

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