A. varies with temperature
B. varies with wavelength of the incident ray
C. is equal to its emissivity
D. does not vary with temperature and. wavelength of the incident ray
E. none of the above
A. emissivity
B. transmissivity
C. reflectivity
D. intensity of radiation
E. absorptivity
A. convection
B. radiation
C. conduction
D. both convection and conduction
E. none of the above
A. m2/hr
B. m2/hr°C
C. kcal/m2 hr
D. kcal/m.hr°C
E. kcal/m2 hr°C
A. Equivalent thickness of film
B. Thermal conductivity Equivalent thickness of film Specific heat x Viscocity
C. Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity
D. Film coefficient x Inside diameter Thermalconductivity
E. none of the above
A. moisture
B. density
C. temperature
D. all of the above
E. none of the above
A. a dimensionless parameter
B. function of temperature
C. used as mathematical model
D. a physical property of the material
E. useful in case of heat transfer by radiation
A. high thickness of insulation
B. high vapour pressure
C. less thermal conductivity insulator
D. a vapour seal
E. all of the above
A. its temperature
B. nature of the body
C. kind and extent of its surface
D. all of the above
E. none of the above
A. aluminium
B. steel
C. brass
D. copper
E. lead