Transformers

114. 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

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

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

Bushings
Core
Primary winding
Secondary winding

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64 288 64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube
href="https://exam.pscnotes.com/mcq/which-of-the-following-parts-of-a-transformer-is-visible-from-outside/#more-43873">Detailed SolutionWhich of the following parts of a transformer is visible from outside?

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

50°C
80°C
100°C
150°C

Detailed SolutionGas is

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usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds

119. Primary winding of a transformer

is always a low voltage winding
is always a high voltage winding
could either be a low voltage or high voltage winding
none of the above

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75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube transformer" class="read-more button" href="https://exam.pscnotes.com/mcq/primary-winding-of-a-transformer/#more-43361">Detailed SolutionPrimary winding of a transformer

120. The core used in high frequency transformer is usually

copper core
cost iron core
air core
mild steel core

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89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube usually" class="read-more button" href="https://exam.pscnotes.com/mcq/the-core-used-in-high-frequency-transformer-is-usually/#more-43303">Detailed SolutionThe core used in high frequency transformer is usually

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