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GATE 2019: Heat Transfer Quiz 4
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Question 1
A 2 passes 3 tubes shell and tube type heat exchanger is used to transfer heat from high temperature to low temperature. The length of the tube is 0.6m and the surface area of the heat transfer of the heat exchanger is 2.67m2. Find the diameter (in cm) of tube of the heat exchanger.
Question 2
For a given reflecting surface, absorbtivity (α) = transsmitivity (Ʈ) = 0 and reflectivity (ρ) = 1. Then the α, Ʈ, ρ for a non-reflecting surface are
Question 3
Determine radiation heat loss from a steel tube of outside diameter 60 mm and 5m long at a temperature of 327 °C if the tube is inside a square conduit made of brick having 0.4 m side as shown in given figure and temperature of 25 °C. (Take, ε(steel)= 0.8, ε(brick)= 0.9.
Question 4
Consider a parallel-flow heat exchanger with area Ap and a counter-flow heat exchanger with area Ac. In both the heat exchangers, the hot stream flowing at 1 kg/s cools from 80 ℃to 50 ℃. For the cold stream in both the heat exchangers, the flow rate and the inlet temperature are 2 kg/s and 10 ℃, respectively. The hot and cold streams in both the heat exchangers are of the same fluid. Also, both the heat exchangers have the same overall heat transfer coefficient. The ratio is 
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________ . Question 5
Consider a surface at 0 °C that may be assumed to be a blackbody in an environment at 25 °C. If 300 W/m2 of radiation is incident on the surface, the radiosity of this black surface is σ
Question 6
In a parallel flow shell and tube heat exchanger having air and hot flue gases as cold and hot fluids. The inlet and exit temperature of cold fluid is 50 °C and 110 °C, while for hot fluid the inlet and exit temperature being 400 °C and 220 °C respectively. The heat transferred per hour is 155850kJ, overall heat transfer coefficient is 68W/
K. If the outside diameter of tube is 70mm, find the length of the tube required for necessary heat transfer to occur.
K. If the outside diameter of tube is 70mm, find the length of the tube required for necessary heat transfer to occur. - 948 attempts
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