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. m2/hr
B. m2/hr°C
C. kcal/m2 hr
D. kcal/m.hr°C
E. kcal/m2 hr°C
A. convection
B. radiation
C. conduction
D. both convection and conduction
E. none of the above
A. emissivity
B. transmissivity
C. reflectivity
D. intensity of radiation
E. absorptivity
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. thermal resistance
B. thermal coefficient
C. temperature gradient
D. thermal conductivity
E. heat-transfer
A. 1 :1
B. 2: 1
C. 1 : 2
D. 4 : 1
E. 1 : 4
A. higher
B. lower
C. same
D. depends upon the shape of body
E. none of the above
A. Grashoff number
B. Nusselt number
C. Weber number
D. Prandtl number
E. Reynold number