51. Film coefficient is defined as the ratio of
52. The highest thermal diffusivity is of
53. The rate of energy transferred by convection to that by conduction is called
54. Thermal conductivity of water _________ with rise in temperature.
55. Which of the following property of air does not increase with rise in temperature?
56. Two balls of same material and finish have their diameters in the ratio of 2 : 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of
57. Thermal conductivity of glass wool varies from sample to sample because of variation in
58. Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by
59. According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to
60. The critical radius is the insulation radius at which the resistance to heat flow is
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