Electrical Engineering MCQs

Page No. 148

In a resistance furnace the atmosphere is_____________?


aoxidizing


bdeoxidising


c reducing


dneutral


View Answer oxidizing

Which of the following has the highest value of thermal conductivity ?


aWater


bsteam


cSold ice


dMelting ice


View Answer Sold ice

Heat transfer by condition will not occur when____________?


a bodies are kept in vacuum


bbodies are immersed in water


cbodies are exposed to thermal radiations


dtemperatures of the two bodies are identical



Heat is transferred simultaneously by condition, convection and radiation_____________?


ainside boiler furnaces


bduring melting of ice


cthrough the surface of the insulted pipe carrying steam


dfrom refrigerator coils to freezer of a refrigerator



For the transmission of heat from one body to another__________?


atemperature of the two bodies must be different


bboth bodies must be solids


c both bodies must be in contact


d at least one of the bodies must have some source of heating



A perfect black body is one that_____________?


atransmits all incident radiations


babsorbs all incident radiations


creflects all incident radiations


dabsorbs, reflects and transmits all incident radiations



When a body reflects entire radiation incident on it, then it is known as____________?


awhite body


bgrey body


cblack body


dtransparent body


View Answer white body

is used for heating non-conducting materials?


aEddy current heating


bArc heating


cInduction heating


dDielectric heating


View Answer Dielectric heating

_________ has the highest value of thermal conductivity?


aCopper


bAluminium


cBrass


dSteel


View Answer Copper

Which of the following heating methods has maximum power factor ?


aArc heating


bDielectric heating


cInduction heating


dResistance heating


View Answer Resistance heating

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