Subject Code: 133401
GUJARAT TECHNOLOGICAL UNIVERSITY
--- Content provided by FirstRanker.com ---
BE - SEMESTER-III (OLD) EXAMINATION — WINTER 2017
Subject Name: Thermodynamics and Thermal Engineering
Date: 14/11/2017
Time: 10:30 AM to 01:00 PM
Total Marks: 70
--- Content provided by FirstRanker.com ---
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Derive the expressions of efficiency in Otto Cycle. 07
--- Content provided by FirstRanker.com ---
(b) Define Ideal and non-ideal gas. How do they differ with each other in their behaviour? Explain the entropy change of an ideal gas. 07
Q.2 (a) Define the following: 07
- Emissivity
- Stefan-Boltzmann Law
- Wien’s Displacement Law
--- Content provided by FirstRanker.com ---
(b) Explain the various types of Heat Exchangers. 07
OR
Q.2 (a) Describe briefly about the following processes: 07
- Sensible heating
- Cooling and dehumidification
--- Content provided by FirstRanker.com ---
(b) Define entropy and irreversibility. Discuss their relationships. 07
Q.3 (a) Explain the working of single-stage reciprocating air compressor with a neat sketch. 07
OR
Q.3 (a) Derive the equation for conduction of heat through a plane wall. 07
(b) Explain PVT behaviour of pure substances with the help of PT and PV diagrams. 07
--- Content provided by FirstRanker.com ---
Q.4 (a) Derive the equation for conduction of heat through a radial wall. 07
(b) Briefly explain the following: 07
- Parallel-flow heat exchangers.
- Counter-flow heat exchangers.
OR
--- Content provided by FirstRanker.com ---
Q.4 (a) Compare Vapour Compression Refrigeration System with Vapour Absorption System. 07
(b) Define the following terms: 07
- Dew point temperature
- Relative humidity
- Specific humidity.
--- Content provided by FirstRanker.com ---
Q.5 (a) Explain Fourier’s Law of Heat Conduction and Explain Thermal Resistance. 07
(b) Calculate the percentage loss in ideal efficiency of a diesel engine with compression ratio 14, if the fuel cut-off is delayed from 5% to 8%. 07
OR
Q.5 (a) Compare the efficiency of Otto, diesel and dual cycle for same compression ratio and heat rejection with help of p-v and T-S diagram. 07
(b) Write down the properties of refrigerant in detail. 07
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU BE/B.Tech 2017 Winter Question Papers || Gujarat Technological University
--- Content provided by FirstRanker.com ---