GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - SUMMER 2019
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Subject Code: 2150102 Date: 20/06/2019
Subject Name: Fundamentals of Turbo Machines
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Explain the need of prime movers in gas turbine engines. 03
(b) Explain the need of compressor in gas turbine engines. 04
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(c) Draw the complete h-s diagram for Axial compressor stage. 07
Q.2 (a) Classify turbomachines. 03
(b) Define degree of reaction. Draw h-s diagram for 50% reaction axial turbine stage. 04
(c) Draw velocity triangle for an axial turbine stage. 07
OR
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(c) Derive expressions for spouting velocity and stage efficiencies for radial turbine. 07
Q.3 (a) Differentiate axial machines and radial machines. 03
(b) Write a shortnote on workdone factor in compressor stage. 04
(c) Draw and explain the velocity triangle for stage of axial compressor. Also derive the expression of degree of reaction and work consumed by the compressor. 07
OR
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(a) Compare axial compressor and centrifugal compressor for their suitability to use in jet engines. 03
(b) How to find equilibrium running point for a turbomachine? 04
(c) Write a note on radial equilibrium and free vortex stage. 07
Q.4 (a) Why centrifugal compressors have volute diffuser? 03
(b) Define flow coefficient, work loading coefficient and utilization factor. 04
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(c) Draw velocity triangles for forward, backward and radial tipped centrifugal compressor. 07
OR
(a) What is rotating stall? When does it occur? 03
(b) Explain in the brief losses occur in turbomachines. 04
(c) Draw impellers for centrifugal compressor stage. 07
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Q.5 (a) Draw change in pressure and velocity along the fixed blades and rotor blades for two stage reaction turbine. 03
(b) Draw and explain schematic diagram for a radial turbine stage. 04
(c) Draw the velocity triangle of outward flow reaction turbine. 07
OR
(a) What is equilibrium running point and equilibrium running line? 03
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(b) Write a note on workdone factor. 04
(c) With a neat sketch explain the velocity and pressure compounded axial turbine stages. 07
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