Transformers

12. The purpose of providing iron core in a step-up transformer is

To provide coupling between primary and secondary
To increase the magnitude of mutual flux
To decrease the magnitude of magnetizing current
To provide all above features

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title="The purpose of providing iron core in a step-up transformer is" class="read-more button" href="https://exam.pscnotes.com/mcq/the-purpose-of-providing-iron-core-in-a-step-up-transformer-is/#more-58191">Detailed SolutionThe purpose of providing iron core in a step-up transformer is

14. The noise produced by a transformer is termed as

zoom
hum
ringing
buzz

Detailed

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SolutionThe noise produced by a transformer is termed as

15. The no-load current drawn by transformer is usually what per cent of the full-load current?

0.2 to 0.5 per cent
2 to 5 per cent
12 to 15 per cent
20 to 30 per cent

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current?" class="read-more button" href="https://exam.pscnotes.com/mcq/the-no-load-current-drawn-by-transformer-is-usually-what-per-cent-of-the-full-load-current/#more-57798">Detailed SolutionThe no-load current drawn by transformer is usually what per cent of the full-load current?

16. The power factor of an induction motor under no-load conditions will be closer to

0.2 lagging
0.2 leading
0.5 leading
unity

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button" href="https://exam.pscnotes.com/mcq/the-power-factor-of-an-induction-motor-under-no-load-conditions-will-be-closer-to/#more-57791">Detailed SolutionThe power factor of an induction motor under no-load conditions will be closer to

17. In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be

Ns
s.Ns
(1 - s)Ns
(Ns - 1)s

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speed of an induction motor will be" class="read-more button" href="https://exam.pscnotes.com/mcq/in-ns-is-the-synchronous-speed-and-s-the-slip-then-actual-running-speed-of-an-induction-motor-will-be/#more-57635">Detailed SolutionIn Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be

18. If a transformer is continuously operated the maximum temperature rise will occur in

core
windings
tank
any of the above

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xmlns="http://www.w3.org/2000/svg" viewBox="0 0 576 512"> Subscribe on YouTube class="screen-reader-text">If a transformer is continuously operated the maximum temperature rise will occur in

19. The chemical used in breather for transformer should have the quality of

ionizing air
absorbing moisture
cleansing the transformer oil
cooling the transformer oil

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should have the quality of" class="read-more button" href="https://exam.pscnotes.com/mcq/the-chemical-used-in-breather-for-transformer-should-have-the-quality-of/#more-57512">Detailed SolutionThe chemical used in breather for transformer should have the quality of

20. Buchholz’s relay gives warning and protection against

electrical fault inside the transformer itself
electrical fault outside the transformer in outgoing feeder
for both outside and inside faults
none of the above

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class="youtube-icon"> Subscribe on YouTube protection against" class="read-more button" href="https://exam.pscnotes.com/mcq/buchholzs-relay-gives-warning-and-protection-against/#more-57125">Detailed SolutionBuchholz’s relay gives warning and protection against

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