Heat Transfer Miscellaneous
 Match the property with their units
Property Units A. Bulk modulus 1. W/s B. Thermal conductivity 2. N/m^{2} C. Heat transfer coefficient 3. N/m^{3} D. Heat flow rate 4. W 5. W/mK 6. W/m^{2}K

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NA
Correct Option: B
NA
 Thermal conductivity is lower for

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NA
Correct Option: B
NA
 A solid sphere 1 of radius r is placed inside a hollow, closed hemispherical surface 2 of radius 4r. The shape factor F is,

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f _{11} + f _{12} = 1
∴ f _{12} = 1
f _{21} A_{2} = f _{12} A_{1}∴ f_{21} = f_{12}A_{1} = 1 × 4πr^{2} = V = 1 A_{2} k (1 / 2)4π(4r)^{2} + π(4r)^{2} 12 Correct Option: A
f _{11} + f _{12} = 1
∴ f _{12} = 1
f _{21} A_{2} = f _{12} A_{1}∴ f_{21} = f_{12}A_{1} = 1 × 4πr^{2} = V = 1 A_{2} k (1 / 2)4π(4r)^{2} + π(4r)^{2} 12
 A diffuse radiation surface has

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Radiation intensity is independent of angle in diffuse radiation.
Correct Option: A
Radiation intensity is independent of angle in diffuse radiation.
 What is the value of the view factor for two inclined flat plates having common edge of equal length and wlth an angle of 20 degrees?

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F_{12} = F_{21} = 1  sin θ 2 = 1  sin 20° = 0.826 2 Correct Option: A
F_{12} = F_{21} = 1  sin θ 2 = 1  sin 20° = 0.826 2