Q.1
14 Marks(a)
Define Mach Number, Mach cone, and Mach angle.
(b)
Derive the energy equation for one dimensional compressible adiabatic flow.
(c)
Explain propagation of disturbance in compressible fluid with M =1, M<1 and M>1.
Gujarat Technological UniversitySummer 2026 examination
GTU 3161912 Gas Dynamics Summer 2026 Question Paper & PDF
B.E. · Mechanical Engineering · Semester 6 · Subject code 3161912
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 10:30 AM – 1:00 PM
- Questions
- 5 with internal choice
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Q.2
14 Marks(a)
Explain the phenomenon of choking in isentropic flow
(b)
Sketch T-S and h-S diagrams for nozzles with adiabatic and isentropic flow processes
(c)
Derive the following equation for one dimensional isentropic flow and draw the shape of nozzle and diffuser for subsonic, sonic and supersonic flow.
OR
(c)
Explain the effect of varied back pressure in a convergent-divergent nozzle under isentropic flow conditions with neat sketches
Q.3
14 Marks(a)
Differentiate between a nozzle and diffuser.
(b)
Explain “shock condensation”.
(c)
Explain how does a shock wave develop in the diverging section of a supersonic nozzle? How does this wave move towards the exit?
OR
(a)
Write general characteristic of normal shock
(b)
Explain the function of a supersonic diffuser with a neat sketch.
(c)
Starting from the energy equation for flow through a normal shock, obtain the Prandtl Mayer relation,M*xM*y =
Q.4
14 Marks(a)
Define Fanning’s coefficient of friction and hydraulic diameter.
(b)
Write a note on Fanno curve with neat sketches.
(c)
Explain the direction of isothermal flow process with friction with neat T-s diagram.
OR
(a)
What is Fanno flow? Write governing equations for Fanno flow.
(b)
Derive expression for pressure ratio, temperature ratio and velocity ratio for the Fanno flow of a perfect gas.
(c)
Draw the Fanno curve on h-s diagram and discuss the effect of friction in case of subsonic and supersonic flow. What is the limiting value of Mach number?
Q.5
14 Marks(a)
Write continuity and momentum equations for the Rayleigh flow process and show its plot on the (h-s) diagram.
(b)
What is Rayleigh flow? Give two practical examples.
(c)
Explain the expansion and compression both adiabatically and isentropically with the help of T-s and P-V diagrams.
OR
(a)
State the four assumptions of Rayleigh flow.
(b)
Differentiate between open and closed-circuit wind tunnels .
(c)
Derive the equation of maximum non-dimensional heat transfer rate in Rayleigh flow process. Also obtain the value of supersonic mach number for the same maximum heat transfer
Other Semester 6 subjects
BE Mechanical
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About this paper
Official Gujarat Technological University (GTU) examination paper for Gas Dynamics (Summer 2026, B.E. · Mechanical Engineering, Sem 6). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.