Which of the following is a case of steady state heat transfer ___________________? A. I.C. engine B. air preheaters C. heating of building in winter D. all of the aboveE. none of the above
Which of the following is the case of heat transfer by radiation ___________________? A. blast furnace B. heating of building C. cooling of parts in furnaceD. heat received by a person from fireplace E. all of the above
Heat flowing from one side to other depends directly on ___________________? Pick up the wrong case? A. face area B. timeC. thickness D. temperature difference E. thermal conductivity
Heat transfer in liquid and gases takes place by_____________________? A. conductionB. convection C. radiation D. conduction and convection E. convection and radiation
Unit of thermal conductivity in S.I. units is__________________? A. J/m2 sec B. J/m °K sec C. W/m °K D. A. and C. aboveE. B. and C. above
When heat is Transferred by molecular collision, it is referred to as heat transfer by __________________? A. conduction B. convection C. radiation D. scattering E. convection and radiation
Sensible heat is the heat required to __________________? A. change vapour into liquid B. change liquid into vapourC. increase the temperature of a liquid of vapour D. convert water into steam and superheat it E. convert saturated steam into dry…
Thermal conductivity of solid metals with rise in temperature normally___________________? A. increasesB. decreases C. remains constant D. may increase or decrease depending on temperature E. unpredictable
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 ___________________? A. conduction B. convection C. radiation D. conduction and convection E. convection…
Unit of thermal conductivity in M.K.S. units is ___________________? A. kcal/kg m2 °CB. kcal-m/hr m2 °C C. kcal/hr m2 °C D. kcal-m/hr °C E. kcal-m/m2 °C