81. With increase in temperature, the total emissivity of conductors
82. For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are
83. Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid
84. The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid
85. The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be
86. The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.
87. Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.
88. Which of the following is generally considered as opaque surface towards radiations?
89. The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are
90. Heat transfer by __________ may not necessarily require the presence of a medium.
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