Download GTU BE/B.Tech 2018 Winter 4th Sem New 2140503 Process Heat Transfer Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 4th Sem New 2140503 Process Heat Transfer Previous Question Paper

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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?IV (NEW) EXAMINATION ? WINTER 2018
Subject Code:2140503 Date:10/12/2018

Subject Name:Process Heat Transfer

Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Define: i) emissivity, ii) black body, iii) grey body. 03
(b) What are the advantages of square pitch arrangement over the triangular pitch in case
of heat exchanger tubes?
04
(c) Explain Fourier?s law for heat of conduction. 07

Q.2 (a) Define capacity and economy of evaporator. 03
(b) Give the physical significance of (i) Nusselt Number (ii) Prandtl Number. 04
(c) Explain Boiling Point Elevation (BPE). 07
OR
(c) Write short notes on Natural Convection. 07
Q.3 (a) What is black body? Give applications where this concept is used in heat transfer. 03
(b) Differentiate between filmwise and dropwise condensation. 04
(c) Discuss with the help of diagram various regimes of pool boiling. What is the use of
finding critical flux and critical temperature drop?
07
OR
Q.3 (a) Discuss Planck?s law of radiation. 03
(b) Discuss about concurrent and counter current flow arrangement in heat exchangers. 04
(c) Derive the expression for critical radius of insulated pipe. Explain its significance. 07
Q.4 (a) Enlist different types of fins with neat sketch. 03
(b) Discuss the effect of non-condensable gases on condensation. 04
(c) Discuss construction and working of Plate type heat exchanger. 07

OR
Q.4 (a) What do you mean by fouling of heat exchangers? 03
(b) Define convection and write down difference between free and forced convection. 04
(c) With neat diagram explain construction and working of Box type furnace. 07
Q.5 (a) Explain the significance of LMTD correction factor. 03
(b) Explain the terms absorptivity, emissivity, transmissivity and reflectivity for heat
transfer by radiation.
04
(c) What is importance of LMTD? Derive the equation for parallel flow arrangement. 07
OR

Q.5 (a) Draw the sketch of various methods of feeding the multiple effect evaporators. 03
(b) Write Dittus-Boeltier equation and Sieder-Tate equation explaining each term and
highlight the difference.
04
(c) Explain in details with neat sketch: Shell & Tube heat exchanger. 07


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