GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018
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Subject Code:2150102 Date:11/12/2018Subject Name:Fundamentals of Turbo Machines
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
Q.1 (a) Difference between rotor blade and stator blade. 03
(b) Explain high reaction stages for axial compressor stage. 04
(c) Difference between positive displacement machine and 07
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turbomachines. Q.2 (a) Draw surging in compressors. 03
(b) Define Degree of reaction for axial compressor and axial 04
turbine.
(c) Explain H-S diagram for axial compressor stage. 07
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OR(c) Draw and explain variation of air angles and degree of 07
reaction along the blade height in a free vortex stage.
Q.3 (a) Draw a pressure and velocity variation through a 03
compressor stage.
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(b) Explain ideal and actual performance curves for an axial 04Compressor.
(c) Write a short note on stall propagation in a compressor 07
blade row.
OR
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Q.3 (a) Difference between compressor and turbine. 03(b) Draw an energy ‘flow diagram for an axial flow 04
compressor stage:
(c) Write a shortnote on free vortex flow for axial compressor 07
stage.
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Q4 (a) Explain zero degree reaction stage for axial turbine stage. 03
(b) Deriverelation for total to total efficiency for axial turbine 04
stage.
(c) Draw and explain a velocity triangle for axial turbine 07
stage.
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ORQ4 (a) Draw stodola’s model of flow with slip. 03
(b) Draw entry and exit velocity triangles for impeller blades 04
only in the radial section, backward swept blades for
centrifugal compressor.
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(c) Explain elements of a centrifugal compressor stage. 07 Q.5 (a) Write an equation of Balje’s formula. 03
(b) Draw and explain an Impulse turbine stage. 04
(c) Explain Counter rotating blade rings of a Ljungstrom 07
turbine with neat sketch.
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Q.5 (a) Explain with equation spouting velocity. 03
(b) Draw a performance chart for various axial turbine stages. 04
(c) Explain elements of a radial turbine stage with neat 07
sketch.
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