Put Paper(i.c.engine).docx

MEERUT INSTITUTE OF ENGINEERING AND TECHNOLOGY THIRD SESSIONAL EXAM Subject : Name Subject code : Time- 3:00 Hrs Course Branch: M.M = 100 Section A Attempt all parts (No Choice) ( Ten questions) Q1)

(10X2 = 20)

(a) What is meant by abnormal combustion? (b).What do you mean by volumetric efficiency? (c) Differentiate between reciprocating & centrifugal flow compressor (d) Explain the working of thermo-syphon cooling system with neat sketch (e) State the functions of lubricants in I C engines (f) Draw the PV diagram of Otto Cycle. (g) Define octane number, its importance as SI engine fuel property (h) Draw the PV diagram of single stage compressor with clearance volume. (i) What do you mean of supercharging? (j) Explain the principle of carburetion

Section B Attempt any Five Questions from this section

( Five questions out of Eight) (5X10 =50)

Q 2. Drive an expression for work done of single stage reciprocating compressor with clearance volume. Q 3. Briefly explain the following (i) Forced circulation cooling system. (ii) Axial flow compressor Q 4. Describe a Battery ignition system with the help of a sketch. Q 5. What is ignition delay in case of C.I. Engines? Discuss the variables affecting ignition delay. Q 6. Drive an expression for volumetric efficiency. Q 7. In an engines working on Diesel cycle inlet pressure and temperature are 1 bar and 17 ºC respectively. Pressure at the end of adiabatic compression is 35 bar. The ratio of expansion after constant pressure heat addition is 5. Calculate the heat addition, heat rejection and the efficiency of the cycle .Assume ratio of specific heat =1.4, Cp =1.004 kJ/Kg K and Cv=0.717 kJ/Kg K for air. Q 8. How is the solid injection system classified? Explain the working of common rail injection system Q 9. Compare SI and CI engines with respect to basic cycle, fuel used, introduction of fuel, ignition, compression ratio, speed, efficiency.

Section C

Attempt any TWO Questions from this section (Two out of Three) (2X15 = 30) Q 10. A single stage reciprocating compressor takes 1 m3 of air per minute at 1.013 bar and 150C and delivers it at 7 bar. Assume that law of compression is PV1.35= C. And clearance volume is negligible, Calculate the power. Q 11. Explain with neat scatch different type of lubrication system in details. Q 12. a) Derive an expression for air-fuel ratio of a simple carburetor. b) Explain the stages of combustion in a CI engines