(6) Determine the sizes of fuel orifice to give a 13.5 air fuel ratio, if the venture throat has 3 cm diameter and the pressure drop in the venture is 6.5 cm Hg. The air temperature and pressure at carburetor entrance are 1 bar and 27 °C respectively. The fuel orifice is at the same level as that of the float chamber. Take density of gasoline as (7 deg.) 740 kg/m³ and discharge coefficient as unity. Assume atmospheric pressure to be 76 cm of Hg. (7) A four-cylinder, four-stroke internal combustion engine has a bore of 87 mm. and a stroke of 77 mm. The clearance volume is 17% of the stroke volume and the engine with speed of 2700 rpm. The processes within each cylinder are modeled as an Otto cycle with a pressure of 1 atm and a temperature of 17 °C at the beginning (7 deg.) of compression. The maximum temperature in the cycle is 2717 °C (a) Draw the P-v diagram; label Pressures, Temperatures, Qin, and Qual (b) Calculate the mass of air at the beginning of the cycle (c) Calculate the Pressure in kPa and Temperature in K at each step in the cycle (d) Calculate the net Work per cycle in Joules (e) Calculate the power developed by the engine in kW (f) Calculate the thermal efficiency of this engine (8) A six cylinder, four-stroke petrol engine with a bore of 125 mm and a stroke of 190 mm under test was supplied with petrol of composition C-82%, and H2-18% by mass. The dry exhaust composition by volume was CO2-11.19%, O2-3.61%, and N2-85.2%. Determine 1) The mass of air supplied per kg of petrol. 2) The percentage excess air. (7 deg.) 3) The volume of mixture per kg of petrol, at 17 °C and 1 bar which were the condition for the mixture entering the cylinder during the test. 4) The volumetric efficiency of the engine based on intake conditions when the mass of petrol used per hour was 31.3 kg and the engine speed was 1500 lev/min. The petrol is completely evaporated before entering the cylinder and the effect of its volume on the volumetric efficiency should be included. Take the density of petrol vapour as 3.35 times that of air at the same temperature and pressure. 1 kg of air at 0 °C and 1.013 bar occupies 0.377 m³. Air contains 23% oxygen by mass. 0.794-6 0.21x bear11 33 Head of Automobile Engineering Department Dr. Dhyai Hassan Jawad Aljashaami Examiner Assist Prof. Dr. Emad Dawood Aboud 2-2

2/Y Y+1 2Cp Q1/ Show that Cda Az x P1 mactual Cdf Af R/T₁ 2pf(P1-P2-zxgxpf) Q2/ A simple jet carburetor has to supply 5 Kg of air per minute. The air is at a pressure of 1.013 bar and a temperature of 27 °C. Calculate the throat diameter of the choke for air flow velocity of 90 m/sec. Take velocity coefficient to be 0.8. Assume isentropic flow and the flow to be compressible. Quiz/ Determine the air-fuel ratio supplied at 5000 m altitude by a carburetor which is adjusted to give an air-fuel ratio of 14:1 at sea level where air temperature is 27 °C and pressure is 1.013 bar. The temperature of air decreases with altitude as given by the expression The air pressure decreases with altitude as per relation h = 19200 log10 (1.013), where P is in bar. State any assumptions made. t = ts P 0.0065h

26: A petrol engine has a carburettor of 32 mm venturi size. The jet diameter is 2mm. The pressure difference at throat is 50 mm of Hg The atmosphericit to Pressure is 1 bar and temperture 27°C. The coefficient of discharge for venture is 0.85 and for fuel jet o.66. The density of petrol is 750 kg/m³. Nozzle lip is Zero Relative density of Hg 13.6 Find. waily wat The fuel velocity, fuel flow (mp), air velocity and air flow, F/A, neglecting lant Compressibility. aldatzi zit Repeat the question taking Compressibility into account. to b Answers [4.25 m/s.0.006515 Kg/sec, 107.2 m/s, 0.0851 kg/s To bud No apagail 10.0766 video tu 200108.7 m/sec, 0.0822 Kg/s, 0.0793]a plovila

A simple carburetor under a certain condition delivers 5.45 kg/h of petrol with an air fuel ratio of 15. The fuel jet area is 2mm2 with coefficient of discharge of 0.75. If the tip of the fuel jet is 0.635cm above the level of petrol in the float chamber and the venturi throat coefficient of discharge of 0.80. calculate: (i) The venturi depression in cm of H2O necessary to cause air and fuel flow at the desired rate. (ii) The venturi throat diameter. (iii) The velocity of air across the venturi throat. You make take density of air = 1.29 kg/m3 and specific gravity of petrol =0.72

Please attached photo. I have theoretically solved this using only equations I can’t find a way to solve without the mass flow rate or area of the inlet as a given.

Q2 It is proposed to design a crburettor for Maruti Car. The four strok petrol engine has a displacement (swept) of 796 cm³ and develops maximum Power at 5500 rev/min. The volumetric efficiency at this speed is assumed to be 70% and the air-fuel ratio is 13.5:1.It is expected that at peak power the theoretical air speed at the choke will be 105 m/s. the coefficient of discharge for the venturi is assumed to be 0.85 and that of the main petrol iet is 0.66. An allowance should be made for the emulsion tube, the diameter of which can be taken as 1/2.5) of the choke diameter. The petrol surface is 6mm below the choke at this engine condition. Calculate the sizes of a suitable choke and main jet. The specific gravity of petrol is 0.74. Atmospheric pressure and temperature are 1 bar and 27°C respectively. [Answers 21.3 mm, 1.183 mm ] .

When you get your all changed (assume "light oll"), the mechanic adds your dirty and hot 6 quarts of oll to the recycling drum. If your oil is 210 "F, and the drum already contains 4 gallons of oil at room temperature (65 °F), then: (a) What is the final temperature in the recycling drum? (b) What is the total change in entropy? Btu R F

i need correct explanation my best wishes ton

please provide full calculation

Hom work عماد داود عبود (35) Q1 The Fiat Car has a four strok engine of 1089 C.C capacity.It develops maximum power 32kw at 5000 r.p.m. The volumetric efficiency at this speed is 75% and the air-fuel ratio 13:1, At peak power the theoretical air speed at the choke is 120 m/sec. The coefficient of discharge for the venturi is 0.85 and that of the main petrol jet is 0.66. An allowance should be made for the emulsion tube, the diameter of which can be taken as (1/2.5) of the choke diameter, the Petrol surface is 6 mm blow the choke at this engine condition. Calculate the size of a suitable choke (D) and main jet (d). The specific gravity of Petrol is 0.75 and the atmospheric pressure 1.03 bar and temperature 27°c. [D=23.2mm,d=1.296mm]