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Gas Turbines & Jet Propulsion (October 2010)

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Total No. of Questions : 12] P1036 [Total No. of Pages : 5 [3864]-134 B.E. (Mechanical) GAS TURBINES AND JET PROPULSION (2003 Course) (402044) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section - I and 3 questions from Section - II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) What do you understand by sonic velocity? Show that sonic velocity, a= b) [8] VRT . Air at 15 bar 1000 K enters convergent-divergent nozzle with negligible velocity under steady state condition. For a throat area of 30 cm2 find[8] i) Mass flow rate & throat conditions. ii) Pressure & temperature in divergent portion where Mach number is 2 & required exit area. OR Q2) a) b) Py 1 + Mx 2 = where Prove that for a normal shock Px 1 + My 2 is ratio of specific heats of air. [8] Air enters a pipe of 0.05m diameter at stagnation conditions of 10 bar & 400 K at Mach no. of 2.8. If Mach no. at exit is 1.2 & friction factor is 0.005. Find mass flow rate & length of pipe required. Assume Cp = 1.005 kJ/kg K. [8] P.T.O.

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Additional Info : 2003 Course
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