Electrical Engineering MCQs

Page No. 108

The structure sensitive property of a super conductor is______________?


acritical magnetic field


btransition temperature


c critical current density


dnone of the above



The transition temperature of mercury is____________?


a18.0°K


b9.22°K


c4.12°K


d1.14’K


View Answer 4.12°K

At transition temperature the value of critical field is____________?


a zero


bnegative real value


cpositive real value


d complex value


View Answer zero

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


adecreases


b increases


cremains constant


d becomes temperature independent


View Answer increases

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


acopper


bkanthal


cmanganin


d nichrome


View Answer manganin

An H.R.C. fuse is_______________?


aa ceramic body having metal and caps


ba wire of platinum


ca heavy cross-section of copper or aluminium


d a ceramic tube having carbon rod inside it



The conductors have transport phenomena of electrons due to____________?


aelectric field


bmagnetic field


celectromagnetic field


d none of the above


View Answer electric field

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


aNichrome


bConstantan


cKanthal


d Molybdenum


View Answer Nichrome

Mercury as an electric contact material is_______________?


aa liquid


b a metal


c a metal liquid


d a gas


View Answer a metal liquid

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


a Resistance of the conductor


bArea of the conductor section


cLength of the conductor


dAll of the above


View Answer All of the above

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