51. __________ paint has the maximum absorption coefficient.
52. A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun?
53. The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities $${\varepsilon _{\text{x}}}$$ & $${\varepsilon _{\text{y}}}$$ is given by
54. Heat transfer co-efficient (h1) for liquids increases with
55. Baffle spacing
56. In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.
57. The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium. This is __________ law.
58. Solid angle subtended by the finite surface at the radiating element is
59. Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called
60. Agitated film evaporator is suitable for concentrating __________ liquids.
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