Electrical Engineering MCQs

Page No. 320

Which of the following distribution systems is more reliable?


aRadial system


bTree system


cRing main system


d All are equally reliable


View Answer Ring main system

The steel used in steel cored conductors is usually__________?


aalloy steel


bstainless steel


c mild steel


dhigh speed steel


View Answer mild steel

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


aImpedance relay


bMho’s relay


cReactance relay


dNone of the above


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


bIts secondary voltage is 400 V


cIts rating is 2 kVA


d Its secondary current is 20 A



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


ahysteresis and eddy current losses


bfriction and windage losses


ccopper losses


d none of the above



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


afriction and windage losses


bmagnetic losses


chysteresis and eddy current losses


dcopper losses



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


a eddy current loss will decrease


b eddy current loss will increase


c eddy current loss will remain unchanged


dnone of the above



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


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


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


dnone of the above



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


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


bcore built-up of laminations of hot rolled sheet


ceither of the above


dnone of the above



The noise produced by a transformer is termed as_______________________?


azoom


bhum


cringing


dbuzz


View Answer hum

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