Subject Name: Thermal Engineering
Time: 10:30 AM TO 01:00 PM
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Define nozzle and describe effects of friction on performance of the steam nozzle with h-s diagram. [07]
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Q.2 (a) What is necessity of steam compounding in impulse turbine? Explain velocity compounding with neat sketch. [07]
Q.3 (a) Give detailed classification of steam turbine. [07]
Q.4 The total tangential force on one stage of Parson’s turbine is 1100 N. When the blade speed is 100 m/s, the mass flow rate is 5.5 kg/sec. The blade outlet angle is 20 °. Determine the steam velocity at outlet from the blades. [07]
OR
Q.4 (b) Explain nozzle control governing of steam turbine with figure. [07]
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Q.5 (a) Give classification of gas turbine and explain working of closed cycle gas turbine with figure. [07]
Q.5 (b) Write a short note on combined gas and steam power plant. [07]
OR
Q.5 (b) Explain different methods to improve thermal efficiency of a gas turbine plant. [07]
Q.1 A gas turbine operates on Brayton cycle- The temperature range is 1050 K and 288 K. Find pressure ratio for maximum power output. Also determine thermal efficiency, work ratio and power output, if the mass flow rate of air is 20 kg/sec. Take Cp= 1.005 kJ/kg K and y=1.4 for compression and expansion process. [07]
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Q.2 (a) Give difference between jet engine and rocket engine. [07]
Q.2 (b) Explain working principle of Plain Labyrinth gland. [07]
OR
Q.2 (b) Explain working of Pulse jet engine with figure and give its merits. [07]
Q.3 (a) Write short note on binary vapour cycle. [07]
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Q.3 (b) Derive equation for maximum mass flow rate of steam through nozzle. [07]
Q.4 (a) Explain annular combustion chamber of gas turbine. [07]
OR
Q.4 (b) Derive equation of Degree of Reaction for reaction turbine. [07]
Q.5 (a) Derive equation of general relationship between area, velocity and pressure in nozzle flow. [07]
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (OLD) EXAMINATION - SUMMER 2019
Subject Code: 181904 Date: 20/05/2019
Total Marks: 70
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This download link is referred from the post: GTU BE 2019 Summer Question Papers || Gujarat Technological University