Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (AE)-Automobile Engineering 2020 December 3rd Sem 72204 Internal Combustion Engines Previous Question Paper
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech.(AE) (2012 to 2017) (Sem.?3)
INTERNAL COMBUSTION ENGINES
Subject Code : BTAE -303/401
M.Code : 72204
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Answer briefly :
1.
What is a square engine?
2.
Define cetane number.
3.
Draw the p-v diagram for dual cycle?
4.
Name any two methods of petrol engine fuel supply systems.
5.
Why additives are used. Name any two additives used in lubricant.
6.
What is spark retardation?
7.
Explain viscosity rating.
8.
Differentiate between air and water cooling systems.
9.
List limitations of turbocharging.
10.
Define volumetric efficiency.
1 | M-72204
(S2)-532
SECTION-B
11.
Briefly explain the classification of two stroke engines based on scavenging processes
giving neat sketches for each engine.
12.
Discuss the process of combustion in CI engines clearly bringing out the importance of
delay period.
13.
Sketch any fuel injector system used for diesel engine and explain its working.
14.
Following data refers to the simple carburetor. da = 0.08m, Cda = 0.94, df = 0.005m,
Cdf = 0.7. If the pressure drop amount is 0.14 bar then, find out air-fuel ratio when
(a) Nozzle lip is neglected and (b) nozzle lip is 0.5 cm. Assume density of fuel and air are
780 kg/m3 and 1.293 kg/m3 respectively.
15.
Explain the forced circulation cooling system giving neat sketch.
SECTION-C
16.
In S.I engine working on the ideal Otto cycle, the compression ratio is 5.5. The pressure
and temperature at the beginning of compression are 1 bar and 27?C respectively. The
peak pressure is 30 bar. Determine the pressure and temperatures at the salient points, the
air standard efficiency and the mean effective pressure. Assume ratio of specific heat to
be 1.4 for air.
17.
Discuss various methods of cooling internal combustion engine giving merits and
demerits of each.
18.
What do you understand by term turbo-charging? How is turbo-charging different from
supercharging? Explain with a neat sketch the principle of exhaust turbo- charging of a
single cylinder engine.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
2 | M-72204
(S2)-532
This post was last modified on 13 February 2021