Electrical Engineering MCQs

Page No. 320

Which of the following distribution systems is more reliable?


aRadial system

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bTree system

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cRing main system

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d All are equally reliable

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View Answer Ring main system

The steel used in steel cored conductors is usually__________?


aalloy steel

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bstainless steel

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c mild steel

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dhigh speed steel

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View Answer mild steel

Which of the following relays is used on long transmission lines?


aImpedance relay

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bMho’s relay

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cReactance relay

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dNone of the above

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View Answer Mho’s relay

Which of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V A.C. supply is incorrect?


aIts secondary current is 5 A

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bIts secondary voltage is 400 V

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cIts rating is 2 kVA

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d Its secondary current is 20 A

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In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?


ahysteresis and eddy current losses

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bfriction and windage losses

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ccopper losses

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d none of the above

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Losses which occur in rotating electric machines and do not occur in transformers are___________?


afriction and windage losses

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bmagnetic losses

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chysteresis and eddy current losses

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dcopper losses

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For given applied voltage, with the increase in frequency of the applied voltage?


a eddy current loss will decrease

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b eddy current loss will increase

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c eddy current loss will remain unchanged

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dnone of the above

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In a power or distribution transformer about 10 per cent end turns are heavily insulated__________?


a to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns

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b to absorb the line surge voltage and save the winding of transformer from damage

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c to reflect the line surge and save the winding of a transformer from damage

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dnone of the above

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Reduction in core losses and increase in permeability are obtained with transformer employing__________?


acore built-up of laminations of cold rolled grain oriented steel

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bcore built-up of laminations of hot rolled sheet

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ceither of the above

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dnone of the above

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The noise produced by a transformer is termed as_______________________?


azoom

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bhum

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cringing

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dbuzz

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View Answer hum

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