Transformers Archives

111. The transformer laminations are insulated from each other by

mica strip

thin coat of varnish

paper

any of the above

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Solution

112. 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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of a transformer has" class="read-more button" href="https://exam.pscnotes.com/mcq/no-load-current-of-a-transformer-has/#more-44792">Detailed Solution

113. 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

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

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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

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

Horn gaps

Thermal overload relays

Breather

Conservator

Detailed SolutionWhich

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

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

zero

1 ohm

1000 ohms

infinite

Detailed

Solution

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

Bushings

Core

Primary winding

Secondary winding

Detailed

Solution

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

50Â°C

80Â°C

100Â°C

150Â°C

Detailed Solution Join Our Telegram Channel

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 class="screen-reader-text">Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds