Mechanical Engineering MCQs

Page No. 156

Cork is a good insulator because it has___________________?


afree electrons


batoms colliding frequency


clow density


dporous body


View Answer porous body

Metals are good conductors of heat because________________?


atheir atoms collide frequently


btheir atoms-are relatively far apart


cthey contain free electrons


dthey have high density



Temperature of steam at around 540°C can be measured by ____________________?


athermometer


bradiatiouv pyrometer


cthermistor


dthermocouple


View Answer thermocouple

Thermal conductivity of water in general with rise in temperature ____________________?


aincreases


bdecreases


cremains constant


dmay increase or decrease depending on temperature



Which of the following is a case of steady state heat transfer ___________________?


aI.C. engine


bair preheaters


cheating of building in winter


dnone of the above


View Answer none of the above

Which of the following is the case of heat transfer by radiation ___________________?


ablast furnace


bheating of building


ccooling of parts in furnace


dheat received by a person from fireplace



Heat flowing from one side to other depends directly on ___________________? Pick up the wrong case?


aface area


btime


cthickness


dtemperature difference


View Answer thickness

Sensible heat is the heat required to __________________?


achange vapour into liquid


bchange liquid into vapour


cincrease the temperature of a liquid of vapour


dconvert water into steam and superheat it



Thermal conductivity of solid metals with rise in temperature normally___________________?


aincreases


bdecreases


cremains constant


dmay increase or decrease depending on temperature


View Answer decreases

When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by ___________________?


aconduction


bconvection


cradiation


dconduction and convection


View Answer conduction

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