Download GTU BE/B.Tech 2019 Summer 8th Sem Old 181904 Thermal Engineering Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 8th Sem Old 181904 Thermal Engineering Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VIII (OLD) EXAMINATION ? SUMMER 2019
Subject Code: 181904 Date: 20/05/2019

Subject Name:Thermal Engineering

Time: 10:30 AM TO 01:00 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 nozzle and describe effects of friction on performance of the steam
nozzle with h-s diagram.
07
(b) What is necessity of steam compounding in impulse turbine? Explain
velocity compounding with neat sketch.
07

Q.2 (a) Give detailed classification of steam turbine. 07
(b) 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
o
. Determine the steam velocity at outlet from the blades.
07
OR
(b) Explain nozzle control governing of steam turbine with figure. 07

Q.3 (a) Give classification of gas turbine and explain working of closed cycle gas
turbine with figure.
07
(b) Write a short note on combined gas and steam power plant. 07
OR
Q.3 (a) Explain different methods to improve thermal efficiency of a gas turbine
plant.
07
(b) 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 ?=1.4 for compression and
expansion process.
07

Q.4 (a) Give difference between jet engine and rocket engine. 07
(b) Explain working principle of Plain Labyrinth gland. 07
OR
Q.4 (a) Explain working of Pulse jet engine with figure and give its merits. 07
(b) Write short note on binary vapour cycle. 07

Q.5 (a) Derive equation for maximum mass flow rate of steam through nozzle. 07
(b) Explain annular combustion chamber of gas turbine. 07
OR

Q.5 (a) Derive equation of Degree of Reaction for reaction turbine. 07
(b) Derive equation of general relationship between area, velocity and pressure
in nozzle flow.
07

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