B.TechSemester 52023-24Automobile Engines CombustionKAU051
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Automobile Engines Combustion (KAU051) - AKTU Question Paper 2023-24

B.Tech · Semester 5 · Free PDF Download

This is the official AKTU Automobile Engines Combustion Previous Year Question Paper for B.Tech Semester 5, academic session 2023-24. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech
Semester:Semester 5
Session:2023-24
University:AKTU / UPTU

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Questions Asked in 2023-24

Automobile Engines Combustion (KAU051) — complete question paper · 100 marks · 3 Hours

Section AAttempt all q u e s t i o n s i n b r i e f . 2 x 10 = 20
  • a
    Explain the term Intern al Combustion Engine. 2 1
  • b
    Discuss the term “Mechanical efficiency”. 2 1
  • c
    Discuss the concept of ‘Flame Propagation’ & ‘Flame Stability’ . 2 2
  • d
    What do you understand by ‘Adiabatic Flame Temperature’? 2 2
  • e
    Discuss the term lean and rich mixture. 2 3
  • f
    List the factors affecting combustion in CI engine. 2 3
  • g
    Explain Physical dela y and Chemical delay in CI Engines. 2 4
  • h
    When does an engine need superc harging? How is it done? 2 4 i. Discuss NOx Emission. 2 5 j. What is the purpose of ‘Catalyti c Converter’ in IC Engine? 2 5
Section BAttempt any three o f t h e f o l l o w i n g :
  • a
    Derive an expression for the efficiency of Otto cycle and co mment on the effect of compression ratio o n the efficiency with respect of ratio of specific heats by means of a suitable graph
  • b
    Explain in brief about flame te mperature. Also Explain in de tail about burning velocity of fuels
  • c
    Bring out clearly the process of combustion in CI engines an d also explain the various stages of combustion
  • d
    Illustrate the operation of a ny two type of modern fuel inje ction system with sketch and also explain working of pintle nozzle and pintaux nozzle with sketches
  • e
    Illustrate Particulate emissions & also give methods of co ntrolling Emissions
Section CAttempt any one p a r t o f t h e f o l l o w i n g :
  • a
    In an engine working on the ideal dual-combustion cycle, the temperature and pressure at the beginning of compression are 100°C and 1 bar respectively. The compression ratio is 13. If the maximum pressure is limited to 80 bar and 1,700 kJ of heat is supplied per kg of a i r , determine the temperatures at sa lient (key) points of the cycle and the ideal thermal efficiency of the engine. Assume γ= 1.4. Cp = 1.01 kJ/kg K and CV = 0.72 kJ/kg K for air
  • b
    Briefly Explain i. Burning Time loss factor ii. Heat loss factor iii. Exhaust blow down factor iv. Pumping loss factor
  • a
    One kg C8H18 fuel is supplie d to an engine with 13 kg of air. Determine the percentage by volume of CO2 in dry exhaust gas considering exhaust gas to consist of CO2, CO and N2
  • b
    Discuss Flue Gas analysis & also describe theoretical air re quired for complete combustion
  • a
    What are the various types of combustion chambers used an SI engine. Also explain the phenomenon of knock in SI engines
  • b
    What are the two conventiona l types of ignition systems that a r e normally used in automobiles? Explain in detail
  • a
    A simple jet carburetor is required to supply 5 kg of air an d 0.5 kg of fuel per minute. The fuel specif ic gravity is 0.75. The air is initially at 1 bar and 300 K. Calculate the thro at diameter of the choke for a f l o w velocity of 100 m/s. Velocity coe fficient is 0.8. If the pressu re drop across the fuel metering orifice is 0.80 of that of the choke, calculate orifice diameter assuming, Cdf = 0.60 and γ= 1.4
  • b
    Derive an expression for the ca lculation of exact A-F ratio i. Neglecting compressibility, and ii. Taking compressibility into account
  • a
    Compare wet sump and dry sump lubrication system. Also Expla in in detail about ‘Crankcase ventilation’
  • b
    Discuss the alternative fuels for IC engines also discuss th e rating for CI engine fuel

Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

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