Transformers

71. A shell-type transformer has

high eddy current losses
reduced magnetic leakage
negligibly hysteresis losses
none of the above

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has" class="read-more button" href="https://exam.pscnotes.com/mcq/a-shell-type-transformer-has/#more-50076">Detailed SolutionA shell-type transformer has

72. Power transformers are designed to have maximum efficiency at

nearly full load
70% full load
50% full load
no load

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button" href="https://exam.pscnotes.com/mcq/power-transformers-are-designed-to-have-maximum-efficiency-at/#more-49872">Detailed SolutionPower transformers are designed to have maximum efficiency at

73. The efficiency of a transformer will be maximum when

copper losses = hysteresis losses
hysteresis losses = eddy current losses
eddy current losses = copper losses
copper losses = iron losses

Detailed SolutionThe efficiency of a transformer will be maximum when

74. Which of the following is not the standard voltage for power supply in India?

llkV
33kV
66 kV
122 kV

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in India?" class="read-more button" href="https://exam.pscnotes.com/mcq/which-of-the-following-is-not-the-standard-voltage-for-power-supply-in-india/#more-49497">Detailed SolutionWhich of the following is not the standard voltage for power supply in India?

75. Reduction in core losses and increase in permeability are obtained with transformer employing

core built-up of laminations of cold rolled grain oriented steel
core built-up of laminations of hot rolled sheet
either of the above
none of the above

Detailed SolutionReduction in core

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losses and increase in permeability are obtained with transformer employing

76. Harmonics in transformer result in

Increased core losses
Increased I2R losses
Magnetic interference with communication circuits
All of the above

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result in" class="read-more button" href="https://exam.pscnotes.com/mcq/harmonics-in-transformer-result-in/#more-49445">Detailed SolutionHarmonics in transformer result in

77. Minimum voltage regulation occurs when the power factor of the load is

unity
lagging
leading
zero

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href="https://exam.pscnotes.com/mcq/minimum-voltage-regulation-occurs-when-the-power-factor-of-the-load-is/#more-49427">Detailed SolutionMinimum voltage regulation occurs when the power factor of the load is

78. Open circuit test on transformers is conducted to determine

hysteresis losses
copper losses
core losses
eddy current losses

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href="https://www.youtube.com/channel/UCNHT8lW-JmLC68rjBfZhdkg?sub_confirmation=1" target="_blank" class="youtube-subscribe-button"> Subscribe on YouTube button" href="https://exam.pscnotes.com/mcq/open-circuit-test-on-transformers-is-conducted-to-determine/#more-49339">Detailed SolutionOpen circuit test on transformers is conducted to determine

79. The function of conservator in a transformer is

to project against internal fault
to reduce copper as well as core losses
to cool the transformer oil
to take care of the expansion and contraction of transformer oil due to variation of temper-ature of sur-roundings

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80. What will happen if the transformers working in parallel are not connected with regard to polarity?

The power factor of the two transformers will be different from the power factor of common load
Incorrect polarity will result in dead short circuit
The transformers will not share load in proportion to their kVA ratings
none of the above

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