7/24/2019 I.C. ENGINES QP-1.doc

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PART-A 4*2=8 Marks (Answer All Questions)

1. Draw diesel cycle and Dual cycle P-V diagram.

2. In what aspects four stroke cycle SI engine differ from that of a CI engine!. "hat is the significance of firing order

#. Compare the construction of CI and SI engine.

PART-B 4*6=24 Marks (Answer All Questions)

$. %a& Compare four stroke and two stroke cycle engines and 'ring out their relati(e meritsand demerits.

%)*&

%'&Compare SI and CI engines and 'ring out their relati(e merits and demerits.+. %a& ,plain the working of a two stroke petrol engine.

%)*&

%'&"ith neat sketches eplain (al(e and port timing diagrams.

. %a& "rite short notes on %i& IP %ii& /P %iii& /S0C %i(& /,P %(& or3ue %(i& 450%)*&

%'&"rite short notes on %i& hermal ,fficiency %ii& echanical ,fficiency

%iii& Volumetric ,fficiency %i(& *elati(e ,fficiency6. %a& "hat are the functions of piston pack components Descri'e their materials and

construction.

%)*&%'&

"rite short notes on %i& Cylinder 'lock %ii& Cylinder head

PART-C 2*9=8 Marks (Answer All Questions)

7. %a& "ith a neat sketch eplain the construction and working of a four stroke petrol engine.

%)*&%'& Deri(e an epression for the efficiency of air standard Diesel cycle.

18. %a& 4 +-cylinder9 #-stroke engine ha(ing 'ore of 11cm and stroke 1+cm consuming 8.16kg

of fuel per minute when working on Dual cycle and running at 1+88 rpm. Compressionratio is 189 pressure and temperature at the 'eginning of the cycle are 8.7$ 'ar and #$ oC.

4ssuming 25! of total heat is supplied at constant (olume and remaining at constant

pressure 0ind a& "ork output '& hermal efficiency%)*&

%'& ,plain the construction of (al(e actuating mechanism and its components. Discuss

in detail the merits and demerits of (al(e actuating mechanisms that are in current use.