Electrical Engineering MCQs

Page No. 108

The structure sensitive property of a super conductor is______________?


acritical magnetic field

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btransition temperature

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c critical current density

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dnone of the above

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The transition temperature of mercury is____________?


a18.0°K

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b9.22°K

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c4.12°K

✓


d1.14’K

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View Answer 4.12°K

At transition temperature the value of critical field is____________?


a zero

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bnegative real value

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cpositive real value

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d complex value

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View Answer zero

By increasing impurity content in the metal alloy the residual resistivity always_____________?


adecreases

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b increases

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cremains constant

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d becomes temperature independent

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View Answer increases

The coils of D.C. motor starter are wound with wire of_______________?


acopper

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bkanthal

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cmanganin

✓


d nichrome

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View Answer manganin

An H.R.C. fuse is_______________?


aa ceramic body having metal and caps

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ba wire of platinum

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ca heavy cross-section of copper or aluminium

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d a ceramic tube having carbon rod inside it

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The conductors have transport phenomena of electrons due to____________?


aelectric field

✓


bmagnetic field

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celectromagnetic field

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d none of the above

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View Answer electric field

Which of the following resistive materials has the lowest temperature co-efficient of resistance ?


aNichrome

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bConstantan

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cKanthal

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d Molybdenum

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View Answer Nichrome

Mercury as an electric contact material is_______________?


aa liquid

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b a metal

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c a metal liquid

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d a gas

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View Answer a metal liquid

On which of the following factors does the resistivity of a material depend ?


a Resistance of the conductor

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bArea of the conductor section

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cLength of the conductor

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dAll of the above

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View Answer All of the above

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