57. Heat is transferred by all three modes of transfer, viz, conduction, convection and radiation in
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58. According to Prevost theory of heat exchange
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59. When heat is transferred by molecular collision, it is referred to as heat transfer by
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60. The ratio of heat flow Q1/Q2 from two walls of same thickness having their thermal conductivities as K1 = 2K2 will be
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61. Sensible heat is the heat required to
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62. A grey body is one whose absorptivity
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63. Thermal diffusivity is
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