Download AKTU B-Tech 5th Sem 2018-2019 RME 051 Engines Compressors Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 5th Semester (Fifth Semester) 2018-2019 RME 051 Engines Compressors Question Paper

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B. TECH.
(SEM V) THEORY EXAMINATION 2018-19
LC. ENGINES & COMPRESSORS
Time: 3 Hours T 0111! Marks: 70
Note:
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b
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Attempt aJl Sections. If require any missing data; then choose suitably.
SECTION A
Attempt all questionsin brief. 2 x7 = [4
Differentiatebetween two stroke and four stroke engines.
Draw P?V & T~S diagram for Otto, Dlescl and Dual Cycle,
Explain Stoichiomctric Air Fuel ratio.
What are the alternate Fuels for LC. Engines?
Explain delay period in CI engine.
Explain Octane number and Cemin no. in brief.
Differentiate between Reciprocating and Rotary air compressor.
SECTION B
Attempt any three ofthefollowing: I 7 x 3 = 2.1? N
Derive the ef?ciency of Dual cycle . ?
With the' help of a neat sketch explain the working principle of sunplc carburettor,
Explain the types of Combustion chamber design 111 CI engine.
Explain the advantages and diSadi/?antages oi Supercharger Also explain its types.
Following dam relates to 4 cylinders, 4 stroke petrol engine. AirlFucl ratio by weight [6:1
Calorific value of the fuel- 45200 kJ/kg, Mechanical ef?ciency -82% Air Standard ef?ciency
v 2 ?/3 Relative ef?mmcy -70?/., Voinmctric efficicncy =78%, Strokelbore ratio = 1.25, Suction
Cnnditions = 1 bar . 25 ?C Speed 2400 rpm, Power at brakes of 7?2 kW Calculate (i)
Compremon ratio (iii Brake speci?c fuel consumption (iII?) Bore, and stroke.
SECTION c ?
Attempt any one part oflhcfollowing: - 7 x 1=7
Compare Otto, Diesel and Dual cycle for the
(i) Same compr?sswn ratio & heat input. :
(ii) Same peak pressure & heat input.
Fuel supplied to an SI engine has a calon?c value 42000 ?d/kg The Pressura in the cylinder at
0% and 70% of the compression stoke an: 1.3 ha; and 2 6 bar respectively. Assuming that
compressnon follows the law PVJ I=Const2mt. Find the compression ratio 11' the relative
cf?ci ency of the engine compared With the 311- standard ef?ciency is 50% Calculate the fuel
consumption in kg/kWh
Attempt any one part ofthefollowing: 7 x 1=7
Explain normal and abnormal combustion in 31 engine. Also factors affecting knocking in SI
engine
Compare Battery and Magneto i Ignition systcm" Sketch the constructicnal layout of Battery
Ignition system in details.
Attempt any one part ofthefollowing: 7 1 [=7
Explain the satges of combustion 011 P-G diag: "?71 in CI, Engine
ClarzsIfy fuel injection system Why thc air in_IcA.1;I,'I11 system is 11;: I m a days Also exp! .:,~.
common {ail fuel iuJechon systgm with diagram

Attempt any one part ofthefollowlng: 7 x 1:7
a. Describe advmtagcs and disadvantages of Air and Water cooling. Explain Thermostat
coating system with diagram.
b. Explam the thlan?s line and Morse test in detail.
Attempt any one part ofthefollowing: 7 x 1:7
3. Explainthe advantages of multistage compression with help of PV and TS diagmm.
Derive Optimumpressure ratio for two stage compressor and also ?nd minimum work of
Compression.
h A two stage air compmcs??. compresses air from 17? C and 1 bar to 65 bar. The air is
Cooled in the intercoolv to 30" C and intermediate pressure is steady at 7.7 bar. The low
pressure Cylinder is 1U cm diameter and the stroke for both cylinders is 11.25 cm
Assuming 3 Compression law of PV?= constant, and that the volume of air at
atmospheric oondttionsDrawn in per stroke is equal to the low pressme cylinder swept
volume. ?nd thc power of the Compressor while running at 250 rpm. Find also the
diameter of HP cylinder.