A grey body is one whose absorptivity_________________?

Related Mcqs:

When heat is transferred form hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by __________________?

A. conduction B. convection C. radiation D. conduction and convection E. convection and radiation...

Thermal conductivity of air with rise in temperature__________________?

A. increases B. decreases C. remains constant D. may increase or decrease depending on temperature E. none of the above...

Moisture would find its way into insulation by vapour pressure unless it is prevented by __________________ ?

A. high thickness of insulation B. high vapour pressure C. less thermal conductivity insulator D. a vapour seal E. all of the above...

According of Kirchhoff’s law______________________?

A. radiant heat is proportional to fourth power of absolute temperature B. emissive power depends on temperature C. emissive power and absorptivity are constant for all bodies D. ratio of emissive power to absorptive power is maximum for perfectly black body E. ratio of emissive power to absorptive power for all bodies is same and … According of Kirchhoff’s law______________________?Read More...

Log mean temperature difference in case of counter flow compared to parallel flow will be________________?

A. same B. more C. less D. depends on other factors E. none of the above...