Q.1 (a) Two black discs of 0.5 meter diameter are placed opposite at a distance of 1 meter.Temprature of discs are 1000 deg k and 500 deg k.When both the discs are connected by a black cylindrical no-flux
surface,calculate the heat flow between them.
07
(b) Explain Kirchoff's law for radiation 07
Q.2 (a) Temprature of steam flowing through a pipe of 5 cm diameter is 150 deg c.Temprature of surrounding is 27 deg c.Emissivity of pipe is 0.8.Calculate the heat transferred if length of pipe is 7 meters.
07
(b) Derive equation for heat flow for composite wall having three layers. 07
OR
(b) Derive equation for heat flow for cylinder having three layers. 07
Q.3 (a) Explain : Nucleate boiling. 07
(b) Explain : 1-1 shell and tube heat exchanger. 07
OR
Q.3 (a) Explain : Regimes of pool boiling 07
(b) Derive Stefan boltzmann law 07
Q.4 (a) Explain : Three effect evaporator. 07
(b) Explain Evaporator used to concentrator fruit juice. 07
OR
Q. 4 (a) Explain the concept of Black body. 07
(b) Draw neat sketch of 1-2 shell and tube heat exchanger. 07
Q.5 (a) Explain : Critical radius 07
(b) Derive equation for heat flow for sphere. 07
OR
Q.5 (a) In a double pipe heat exchanger,hot fluid has temperatures of 145 deg c and 90 deg c.Cold fluid has temperatures of 35 degc and 65 deg c.Calculate L.M.T.D for 1. Parallel flow 2. Counter flow.
07
(b) Explain : Forced circulation evaporator. 07
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