B12402 Automobile Engines DAE Question Paper Model : psgpolytech.ac.in
College : Psg Polytechnic College
Degree :DAE (Diploma in Automobile Engineering)
Semester : IV
Subject : B12402 Automobile Engines
Document Type : Model Question Paper
Website : psgpolytech.ac.in
Download Model/ Sample Question Papers : https://www.pdfquestion.in/uploads/psgpolytech.ac.in/6217-b12402.pdf
PSG Automobile Engines Question Paper
PSG POLYTECHNIC COLLEGE, COIMBATORE – 641 004
DIPLOMA EVEN SEMESTER EXAMINATIONS – APR 2014
Instructions :
Related : PSG Polytechnic College B12E12 Motor Insurance & Fleet Managemnt DAE Question Paper Model : www.pdfquestion.in/6240.html
1. Group A and Group B questions should be answered in the Main Answer book.
2. Answer any TEN questions in Group A. Each question carries two marks.
3. Answer ALL questions either (a) subdivision or (b) subdivision in Group B. Each question carries 14 marks.
B12402 Automobile Engines
MODEL QUESTION PAPER
Time : 3 Hours Max.Marks: 100
Group – A
1. State the functions of oil pan.
2. Compare dry liner and wet liner.
3. Write the functions of crankshaft and cam shaft.
4. Define detonation.
5. What is pre-ignition-
6. What is cetane number-
7. State the necessities for cooling of an engine.
8. Mention the advantages of using pressure cap on the radiator filler neck.
9. List the properties needed for lubricating oil.
10. Draw a simple layout for fuel feed system in petrol engine.
11. What are the functions of carburetor-
12. Mention the advantages of port injection in SI engine.
13. What is CRDI- Write its advantages.
14. List the functions of injector.
15. What are the purposes of governors used in diesel engines-
Group– B
16. a) Describe clearly the functions and constructions of crankshaft and connecting rod with neat sketches.
(OR)
b) With the help of a neat sketch, explain the constructional features and working of side valve mechanism.
17. a) Describe the features of any two shapes of combustion chambers for petrol engines with the help of neat sketches.
(OR)
b) Explain the stages of combustion in diesel engine with the help of a neat graph.
18. a) What is the necessity of using thermostat in the engine? Describe the construction and working of wax type thermostat with the help of simple sketch.
(OR)
b) What are the types of lubricating system? Explain the working of pressure lubrication system with a neat sketch.
19. a) With the help of neat sketch, explain the construction and working of AC Mechanical fuel pump.
(OR)
b) Describe the construction and working of MPFI system with a simple layout and write its advantages.
20. a) Explain the construction and working of inline injection pump with the help of neat sketch.
(OR)
b) Explain the constructional features of different types of nozzles with neat sketches.
Thermal Engineering Question Paper :
Time : 3 Hours
Max. Marks : 100
Group – A Marks : 10 x 3 = 30
1. What do you meant by thermodynamic system? State three types of thermodynamic systems?
2. State and explain zeroth law of thermodynamics.
3. Define the entropy change. State it’s significant.
4. Define air cycle and air standard efficiency.
5. Draw the p-V and T-s diagram of Carnot cycle and mention the various processes of the cycle
6. Define: Compression ratio and cut-off ratio.
7. State the difference between S.I engine and C.I engine.
8. What is the function of piston rings used in I.C. engines?
9. Define calorific value of a fuel. State the difference between higher calorific value and lower calorific value of a fuel.
10. State the various stages in the formation of steam.
11. Define the following terms: Dryness fraction and wetness fraction.
12. What are the advantages of using a condenser in a steam turbine plant?
13. State any three industrial applications of compressed air.
14. Define: Ton of refrigeration and refrigeration effect.
15. Describe the term air conditioning.
Group– B :
Marks : 5 x 14 = 70
16. a) A quantity of air occupies a volume of 30 litres at a temperature of 38°C and a pressure of 104 kN/m2. The temperature of air is raised by adiabatic compression until the volume becomes 6 litres.
Find the final temperature, the external work done, the change in internal energy, the heat transferred, the change in enthalphy and the change in entropy.