EXAMIANS
Heat waves
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Which of the following has the minimum absorptivity?
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Low thermal conductivity of heat insulating materials is due to its
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In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.
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Presence of a non-condensing gas in a condensing vapour
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Prandtl and Reynold's analogies are identical for Prandtl number value of
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Steam side heat transfer co-efficient in an evaporator is in the range of __________ kcal/hr.m²°C.
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For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)
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Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?
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In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms⁻². Neglecting the heat capacity of agitator, the temperature of water (in °C) is
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