1,1 51 K/s .. زيد عامر اليوم عند 9:34 م ۱۷۲ من ۱۷۳ University of Babylon College of Engineering Al-Musayab Automobile Engineering Department Final Examination/1" Attempt T19:34 Subject: 1. C. Engines I Maximum Time: 3 Hours Class: 3 Date: 1 / 2023 Answer 07 of the following questions (First Semester) 2022/2023 (1) Choose the correct answer for eight only from below 1- Indicator diagram shows for one complete revolution of crank Maximum mark: 50 Deg. a) variation of kinetic heat in the cylinder. b) variation of pressure head in the cylinder e) variation of kinetic and pressure heat in the cylinder, d) none of the above. 2- A carburetor is used to supply (a) petrol, air and lubricating oil (b) air and diesel (c) petrol and lubricating oil (d) petrol and air. 3- In a four stroke cycle petrol engine, the charge is compressed when a) inlet valve is closed. b) exit valve is closed. e) both inlet and exit valves are closed. d) both inlet and exit valves are open. (8 deg.) 4- For an engine operating on air standard Otto cycle. the clearance volume is 10% of the swept volume. The air standard cycle efficiency is. a) 38.3 % b) 39.8 % c) 60.2% 5- In carburetors, the top of the fuel jet with d) 61.7% n diesel > ŋ otto (c) ŋ diesel > n otto >ŋ dual (b) n dieseln dual > otto (d) notto > n diesel > n dual (2) A petrol engine has the following parameters at sea level: AF-14. T-27 °C. P-1.03 bar. Calculate the AF ratio at the altitude of 5000 (m). Where 1.03 Taltiyude =T-0.0065h and h=19200 x log10 Pau (7 deg.) (3) A 4 cylinder has a following data Bore-15 cm; Piston speed-510 m/min. B.P 60 kW: mech, eff. -0.80 Pm-5 bar. C.V-40000kJ/kg. Calculate i) whether this is 2 Stroke or 4 Stroke engine and why? (7 deg.) (4) Write a notes on heat balance sheet, draw that on the energy flow and state any relations you need. (7 deg.) (5) Derive an expression for the air standard efficiency of diesel combustion cycle in terms of compression ratio, cut-off ratio and pressure ratio. Show the cycle on PV and T-S diagrams. (7 deg.) ט 1-2 أسئلة امتحان Ice فاینل دور الاول О כ' ດ

1,1 51 K/s .. زيد عامر اليوم عند 9:34 م ۱۷۲ من ۱۷۳ University of Babylon College of Engineering Al-Musayab Automobile Engineering Department Final Examination/1" Attempt T19:34 Subject: 1. C. Engines I Maximum Time: 3 Hours Class: 3 Date: 1 / 2023 Answer 07 of the following questions (First Semester) 2022/2023 (1) Choose the correct answer for eight only from below 1- Indicator diagram shows for one complete revolution of crank Maximum mark: 50 Deg. a) variation of kinetic heat in the cylinder. b) variation of pressure head in the cylinder e) variation of kinetic and pressure heat in the cylinder, d) none of the above. 2- A carburetor is used to supply (a) petrol, air and lubricating oil (b) air and diesel (c) petrol and lubricating oil (d) petrol and air. 3- In a four stroke cycle petrol engine, the charge is compressed when a) inlet valve is closed. b) exit valve is closed. e) both inlet and exit valves are closed. d) both inlet and exit valves are open. (8 deg.) 4- For an engine operating on air standard Otto cycle. the clearance volume is 10% of the swept volume. The air standard cycle efficiency is. a) 38.3 % b) 39.8 % c) 60.2% 5- In carburetors, the top of the fuel jet with d) 61.7% n diesel > ŋ otto (c) ŋ diesel > n otto >ŋ dual (b) n dieseln dual > otto (d) notto > n diesel > n dual (2) A petrol engine has the following parameters at sea level: AF-14. T-27 °C. P-1.03 bar. Calculate the AF ratio at the altitude of 5000 (m). Where 1.03 Taltiyude =T-0.0065h and h=19200 x log10 Pau (7 deg.) (3) A 4 cylinder has a following data Bore-15 cm; Piston speed-510 m/min. B.P 60 kW: mech, eff. -0.80 Pm-5 bar. C.V-40000kJ/kg. Calculate i) whether this is 2 Stroke or 4 Stroke engine and why? (7 deg.) (4) Write a notes on heat balance sheet, draw that on the energy flow and state any relations you need. (7 deg.) (5) Derive an expression for the air standard efficiency of diesel combustion cycle in terms of compression ratio, cut-off ratio and pressure ratio. Show the cycle on PV and T-S diagrams. (7 deg.) ט 1-2 أسئلة امتحان Ice فاینل دور الاول О כ' ດ

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.3DP

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