GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-IV (NEW) EXAMINATION - WINTER 2018
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Subject Code: 2140503 Date: 10/12/2018
Subject Name: Process Heat Transfer
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| 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 | ||
| (a) Write short notes on Natural Convection. | 03 | |
| (b) What is black body? Give applications where this concept is used in heat transfer. | 04 | |
| (c) Differentiate between filmwise and dropwise condensation. | 07 | |
| Q.3 | (a) Discuss with the help of diagram various regimes of pool boiling. What is the use of finding critical flux and critical temperature drop? | 03 |
| (b) OR | 04 | |
| (c) Discuss Planck’s law of radiation. | 07 | |
| Q.4 | (a) Discuss about concurrent and counter current flow arrangement in heat exchangers. | 03 |
| (b) Derive the expression for critical radius of insulated pipe. Explain its significance. | 04 | |
| (c) Enlist different types of fins with neat sketch. | 07 | |
| OR | ||
| (a) Discuss the effect of non-condensable gases on condensation. | 03 | |
| (b) Discuss construction and working of Plate type heat exchanger. | 04 | |
| (c) What do you mean by fouling of heat exchangers? | 07 | |
| Q.5 | (a) Define convection and write down difference between free and forced convection. | 03 |
| (b) With neat diagram explain construction and working of Box type furnace. | 04 | |
| (c) Explain the significance of LMTD correction factor. | 07 | |
| OR | ||
| (a) Explain the terms absorptivity, emissivity, transmissivity and reflectivity for heat transfer by radiation. | 03 | |
| (b) What is importance of LMTD? Derive the equation for parallel flow arrangement. | 04 | |
| (c) Draw the sketch of various methods of feeding the multiple effect evaporators. Write Dittus-Boeltier equation and Sieder-Tate equation explaining each term and highlight the difference. Explain in details with neat sketch: Shell & Tube heat exchanger. | 07 | |
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