ME 2041 Advanced I.C. Engines 16 Marks Questions - ME 2041 Part B Important Questions - Mech 8th Semester Advanced I.C. Engines Part B Questions
UNIT- I
1. Discuses why a modern carburetor is being replaced by an injection system in SI engine?
2. Explain the factors that affect the process of carburetion?
3. What are different air –fuel mixture on which an engine can be operated?
4. Explain the following1. Rich mixture, 2. Stoichiometric mixture 3. Lean mixture.
5. How the power and efficiency of the SI engine vary with air- fuel ratio for different load and speed conditions?
6. By means of suitable graph explain the necessary carburetor performance to fulfill engine requirements?
7. Explain why a rich mixture is required for the following 1. Idling 2. Maximum power and sudden acceleration.
8. Describe briefly the MPFI system with a neat sketch?
9. Explain port injection and throttle body injection system?
10. Describe D- MPFI and L-MPFI injection system?
11. Briefly explain the stages of combustion in SI engines elaborating the flame front Propagation
12. Explain the various factors that influence the phenomena of knock in SI engines?
13. Explain the effete of various engine variables on SI engine knock.
14. What are the various types of combustion chamber s used in SI engines? Explain them briefly?
UNIT – II
1. Bring out clearly the process of combustion in CI engines and also explain the various stages of combustion. What is delay period and what are the factors that affect the delay period?
2. Explain with figures various types of combustion chambers used in CI engines.
3. Explain Turbo charging in CI engines.
4. Explain with heat sketch about the air vition
5. What are the effects of trubocharging on CI engines?
6. Compare induction swirl with compression swirl with respect to their advantages and disadvantages.
7. What are the main factors affecting the penetration of the fuel spray in CI engines?
8. Explain about the fuel spray behavior?
UNIT III
1. Describe in detail the causes of hydrocarbon emissions from SI engines.
2. What are catalytic converters? How are they helpful in reducing HC, CO and NOx emissions?
3. Give a brief account of emissions from CI engines.
4. Explain the internationally accepted methods of measuring the following invisible emission
5. i) Oxides of nitrogen (ii) Carbon monoxide (iii) Unburned hydrocarbons
6. What is smoke and classify the measurement of smoke?
UNIT – IV
1. Explain the reasons for looking for alternate fules for IC engines.
2. Explain alcohols as alternate fuels for IC engines bringing out their merits and demerits.
3. Explain the possibility of using reformulated gasoline and water gasoline mixture as alternate fuel.
4. Can alcohol be used for CI engines ? Explain.
5. Explain with a neat sketch the surface-ignition alcohol engine.
6. What are the advantages and disadvantages of using hydrogen in SI engine.
7. Explain the two methods by which hydrogen can be used in CI engine. www.kinindia.com
8. What is natural gas? List the advantages and disadvantages of using natural gas as alternate fuels?
9. Give a brief account of LPG being used as an alternate fuel in SI engine?
10. What are the advantages and disadvantages of using LPG in SI engines?
11. Compare LPG and petrol as fuel for SI engines.
UNIT – V
1. What is the necessity for gasoline injection? Explain with suitable sketch.
2. With neat sketch, explain the exhaust emissions with different air-fuel ratio lean burn spark ignition engines.
3. What do you understand by charge stratification? Explain the method of achieving the same with suitable sketches. Discuss the advantages and disadvantages of charge stratification.
4. Explain briefly plasma – jet ignition system.
5. What is a learn burn engine? What are the advantages of using learn mixture in SI engine?
6. Explain the characteristics of Homogeneous charge compression ignition engine.
7. Explain gasoline direct injection engine.