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me 04-601

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D R2010 (~ages 2) Name .. Reg. No .. SIXTH SEMESTER B.TECH. (ENGINEERTNG). DEGREE EXAl1:INATION, JUNE 200~ ME 04 60l-Ie ENGINES AND GAS TU1.BINES (20CH Admissions) l\1aximum . 100 Marks Time : Three Hours  Answer Question I and Questions? :(l 5 answer (a), (b) or (,:), (d) in '~ach (jllestwn. I. (a) Compare two .stroke and fonr stroke h1gines. State its advantages ana rhsadval\tages. (b) What do you understand by V8l\", ti'Tling diagram? Explain the need ~.nd various events with a neat Sketch. (c) Explain the fuel supply system of Sl an! Cl Engines. (d) What is supercharging? Wh"t dl'f' its limitations? (e) Distinguish between normal ;.lIld ,lbnori'1al combustion. (t) What 'W~ the additives used ill  per.w! crq::;mes. State the need for them, (g) What do you Imderstand by intcl'-ccolmg? Explain its effects on the Gas turbine power  plant (h) Wh at are t he mer it s an d de meri ts o f ce nt ri fuga l and axia l fl ow compr es sors? (8 x..') =.: 40 m~,rks) 2 (a) Exp]am the ideal and actual cycles for ri'~ engine. (7 ;narks) (b) The compression o.tio of an otto cycle l~' 8. At the beginni ng of the compress ion tht:  pres sure and temperature are 1 bar and :-;00 K respectively. The heat transfer to the ,llr per cycle is 1900 KJ/Kg of air. Calculate, (i) The pressure and temperatm'(' at. I he end of each process of the cycle (ii) TI;e thermal efficiency. (iii) The mean effective pre::l::lure. (8 marks) Or (c) Expl ai n dif ferent types of scave nging proce ss in Engi ne s. (7 marks) (d) [n a n air sta nda rd Di ese l cycle , the c omp res sio n ra tio is 16, a nd a t the beg inn ing of i sen tro piC compre ssi on, the temperature IS 15°C and the pressure is 0.1 Mpa. Heat is added until the temperature at the end of the constant  pressure process is 1480°C. Calculate (a) the cut-off ratio, (b) the heat supplied per kg of air, and (c) the cycle efficiency.

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