GTU BE 2019 Summer Question Papers || Gujarat Technological University
Subject Code: 2132502
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-III (NEW) EXAMINATION — SUMMER 2019
Subject Name: Engineering Thermodynamics & Heat transfer
Time: 02:30 PM TO 05:00 PM
Date: 11/06/2019
Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | (a) How Engineering Thermodynamics & Heat Transfer will be helpful to you? | 03 |
| (b) Explain the following terms: (1) System (2) Property (3) Boundary (4) Pure substance | 04 | |
| (c) State First Law of Thermodynamics. Explain the application of it to open and close systems. | 07 | |
| Q.2 | (a) Explain the following terms: (1) Entropy (2) Triple point (3) Critical Point | 03 |
| (b) Define energy and exergy with suitable example. | 04 | |
| (c) Write Kelvin’s and Clausius statements of second law. Describe the concept of reversibility and irreversibility | 07 | |
| OR | ||
| Q.2 | (a) Write a short note on Carnot Cycle. | 03 |
| (b) Classify various types of irreversibility. | 04 | |
| (c) Derive general steady flow energy equation. | 07 | |
| Q.3 | (a) Explain the process of steam formation using p-v and h-s diagram. | 03 |
| OR | ||
| Q.3 | (a) Compare the terms: conduction and convection. | 03 |
| (b) Explain the following laws: (1) Fourier’s Law of heat conduction (2) Newton’s Law of cooling | 04 | |
| (c) Define Property. State difference between Microscopic approach and Macroscopic approach. | 07 | |
| Q.4 | (a) Differentiate between laminar and turbulent flows. | 03 |
| (b) Differentiate between steady state and transient heat conduction. | 04 | |
| (c) State the types of heat convection and differentiate between them. | 07 | |
| OR | ||
| Q.4 | (a) Write the general three dimensional general heat conduction equation in: (1) Cartesian co-ordinates (2) Cylindrical co-ordinates (3) Spherical co-ordinates | 03 |
| (b) Discuss the factors which affect the convective heat transfer coefficient. | 04 | |
| (c) Derive the dimensional less numbers as applied to the analysis of forced convection by dimensional analysis. | 07 | |
| Q.5 | (a) State and express in equation: Stefan Boltzmann law of radiation and Kirchhoff’s law of radiation. | 03 |
| (b) What do you understand by: Reflectivity, Transmissivity and Absorptivity of a body? | 04 | |
| (c) Classify various heat exchangers. Explain any one in brief. | 07 | |
| OR | ||
| Q.5 | (a) What do you mean by fouling factor? What are causes of fouling? | 03 |
| (b) How the cross-flow and multipass heat exchangers are analyzed using LMTD method? | 04 | |
| (c) Define Radiation. Classify and explain various types of bodies. | 07 |
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