Electrical Engineering MCQs

Page No. 109

The value of critical field below the transition temperature will_______________?


a increase


bdecrease


cremain unchanged


dany of the above


View Answer increase

Superconductivity is observed for____________?


ainfrared frequencies


bd.c. and low frequency


ca.c. and high frequency


dfrequencies having no effect



highest conductivity_____________?


a lowest temperature co-efficient


bgood mechanical strength


c easy solderable and drawable quality


d all of the above


View Answer all of the above

High resistivity materials are used in_____________?


aprecision instruments


bheating elements


cmotor starters


dall of the above


View Answer all of the above

In a superconductor the value of critical density depends upon______________?


amagnetic field strength


btemperature


ceither (A) or (B)


d both (A) and (B)


View Answer both (A) and (B)

The conductivity of a conductor can be increased by_______________?


adecreasing its temperature


b increasing its temperature


cdecreasing its vibration


dincreasing its vibration



The superconductivity is due to____________?


a the crystal structure having no atomic vibration at 0°K


ball electrons interact in the super-conducting state


cthe electrons jump into nucleus at 0°K


dnone of the above



Superconductors are becoming popular for use in________________?


agenerating very strong magnetic field


bmanufacture of bubble memories


c generating electrostatic field


dgenerating regions free from magnetic field



Which of the following materials is preferred for transmitting electrical energy over long distance ?


aCopper


bAluminium


cSteel reinforced copper


dSteel reinforced aluminium



A highly conductive material must have___________?


a highest conductivity


blowest temperature co-efficient


cgood mechanical strength


dall of the above


View Answer all of the above

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