Electrical Engineering MCQs

Page No. 109

The value of critical field below the transition temperature will_______________?


a increase

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bdecrease

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cremain unchanged

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dany of the above

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View Answer increase

Superconductivity is observed for____________?


ainfrared frequencies

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bd.c. and low frequency

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ca.c. and high frequency

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dfrequencies having no effect

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highest conductivity_____________?


a lowest temperature co-efficient

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bgood mechanical strength

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c easy solderable and drawable quality

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d all of the above

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View Answer all of the above

High resistivity materials are used in_____________?


aprecision instruments

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bheating elements

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cmotor starters

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dall of the above

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View Answer all of the above

In a superconductor the value of critical density depends upon______________?


amagnetic field strength

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btemperature

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ceither (A) or (B)

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d both (A) and (B)

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View Answer both (A) and (B)

The conductivity of a conductor can be increased by_______________?


adecreasing its temperature

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b increasing its temperature

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cdecreasing its vibration

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dincreasing its vibration

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The superconductivity is due to____________?


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

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ball electrons interact in the super-conducting state

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cthe electrons jump into nucleus at 0°K

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dnone of the above

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Superconductors are becoming popular for use in________________?


agenerating very strong magnetic field

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bmanufacture of bubble memories

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c generating electrostatic field

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dgenerating regions free from magnetic field

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


aCopper

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bAluminium

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cSteel reinforced copper

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dSteel reinforced aluminium

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A highly conductive material must have___________?


a highest conductivity

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blowest temperature co-efficient

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cgood mechanical strength

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dall of the above

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View Answer all of the above

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