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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