Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 8th Sem New 2181928 Steam And Gas Turbines Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2181928 Date:17/05/2019
Subject Name:Steam and Gas Turbines
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) Describe different types of nozzle with neat sketch. 03
(b) Compare open cycle and closed cycle gas turbine. 04
(c) What do you mean by compounding of steam turbine? Explain velocity
compound
vvvdf
compounden
compounded
07
Compounded impulse turbine.
vvvdf
compounden
compounded
Q.2 (a) Explain basic working principle of jet propulsion with neat sketch. 03
(b) Enlist advantages and disadvantages of gas turbine power plant. 04
(c) In a De Laval turbine steam issues from the nozzle with a velocity of 1200
m/s. The nozzle angle is 20?, the mean blade velocity is 400 m/s, and the inlet
and outlet angles of blades are equal. The mass of steam flowing through the
turbine per hour is 1000 kg. Calculate: (i) Blade angles.
(ii) Relative velocity of steam entering the blades. (iii) Power developed.
(iv) Tangential force on the blades. (v) Blade efficiency.
Take blade velocity co-efficient as 0.8
07
OR
(c) A nozzle expands steam from 12 bar and 250?C to 6 bar. Neglecting the initial
velocity, find the minimum area of the nozzles to flow 2 kg/s of steam under
the given conditions. Assume the expansion of steam is isentropic. Calculate
the actual throat area if the coefficient of discharge is 0.98.
07
Q.3 (a) Enlist the method of attachment of blades to turbine rotor. 03
(b) Derive the equation of efficiency for ideal Brayton cycle. 04
(c) Derive an expression for maximum discharge through a nozzle. 07
OR
Q.3 (a) Explain various losses in steam turbine. 03
(b) Explain with neat sketch Nozzle governing for steam turbine. 04
(c) A gas turbine unit has a pressure ratio of 6 : 1 and maximum cycle temperature
of 610?C. The isentropic efficiencies of the compressor and turbine are 0.80
and 0.82 respectively. Calculate the power output in kilowatts of an electric
generator geared to the turbine when the air enters the compressor at 15?C at
the rate of 16 kg/s.
Take cp = 1.005 kJ/kg K and ? = 1.4 for the compression process, and
take cp = 1.11 kJ/kg K and ? = 1.333 for the expansion process.
07
Q.4 (a) State the classification of gas turbine power plant. 03
(b) Derive velocity of steam flowing through a nozzle. 04
(c) Explain with neat sketch working of combined steam and gas turbine power
plant.
07
OR
Q.4 (a) State the effect of super saturation flow in nozzle. 03
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2181928 Date:17/05/2019
Subject Name:Steam and Gas Turbines
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) Describe different types of nozzle with neat sketch. 03
(b) Compare open cycle and closed cycle gas turbine. 04
(c) What do you mean by compounding of steam turbine? Explain velocity
compound
vvvdf
compounden
compounded
07
Compounded impulse turbine.
vvvdf
compounden
compounded
Q.2 (a) Explain basic working principle of jet propulsion with neat sketch. 03
(b) Enlist advantages and disadvantages of gas turbine power plant. 04
(c) In a De Laval turbine steam issues from the nozzle with a velocity of 1200
m/s. The nozzle angle is 20?, the mean blade velocity is 400 m/s, and the inlet
and outlet angles of blades are equal. The mass of steam flowing through the
turbine per hour is 1000 kg. Calculate: (i) Blade angles.
(ii) Relative velocity of steam entering the blades. (iii) Power developed.
(iv) Tangential force on the blades. (v) Blade efficiency.
Take blade velocity co-efficient as 0.8
07
OR
(c) A nozzle expands steam from 12 bar and 250?C to 6 bar. Neglecting the initial
velocity, find the minimum area of the nozzles to flow 2 kg/s of steam under
the given conditions. Assume the expansion of steam is isentropic. Calculate
the actual throat area if the coefficient of discharge is 0.98.
07
Q.3 (a) Enlist the method of attachment of blades to turbine rotor. 03
(b) Derive the equation of efficiency for ideal Brayton cycle. 04
(c) Derive an expression for maximum discharge through a nozzle. 07
OR
Q.3 (a) Explain various losses in steam turbine. 03
(b) Explain with neat sketch Nozzle governing for steam turbine. 04
(c) A gas turbine unit has a pressure ratio of 6 : 1 and maximum cycle temperature
of 610?C. The isentropic efficiencies of the compressor and turbine are 0.80
and 0.82 respectively. Calculate the power output in kilowatts of an electric
generator geared to the turbine when the air enters the compressor at 15?C at
the rate of 16 kg/s.
Take cp = 1.005 kJ/kg K and ? = 1.4 for the compression process, and
take cp = 1.11 kJ/kg K and ? = 1.333 for the expansion process.
07
Q.4 (a) State the classification of gas turbine power plant. 03
(b) Derive velocity of steam flowing through a nozzle. 04
(c) Explain with neat sketch working of combined steam and gas turbine power
plant.
07
OR
Q.4 (a) State the effect of super saturation flow in nozzle. 03
2
(b) Draw neat sketch of can type combustor with swirl flow flame stabilizer. 04
(c) Explain back pressure turbines with neat sketch. 07
Q.5 (a) Define: (i) Blade efficiency and (ii) Stage efficiency. 03
(b) Differentiate impulse turbine and reaction turbine. 04
(c) Explain working of Turbojet engine with neat sketch.
07
OR
Q.5 (a) State the difference between rocket engine and jet engine. 03
(b) Explain ramjet engine. 04
(c) Enlist the methods employed for improvement of thermal efficiency of open
cycle gas turbine plant. Explain any one with neat sketch.
07
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This post was last modified on 20 February 2020