26: A petrol engine has a carburettor of 32 mm venturi size. The jet diameter is2mm. The pressure difference at throat is 50 mm of Hg The atmosphericit toPressure is 1 bar and temperture 27°C. The coefficient of discharge for ventureis 0.85 and for fuel jet o.66. The density of petrol is 750 kg/m³. Nozzle lip is ZeroRelative density of Hg 13.6 Find. waily watThe fuel velocity, fuel flow (mp), air velocity and air flow, F/A, neglectinglant Compressibility. aldatzi zitRepeat the question taking Compressibility into account. to bAnswers [4.25 m/s.0.006515 Kg/sec, 107.2 m/s, 0.0851 kg/sTo bud No apagail 10.0766 video tu200108.7 m/sec, 0.0822 Kg/s, 0.0793]a plovila

At last the Fuel/Air ratio is calculated. We begin by analyzing the air and fuel flow via the…

Answered: 26: A petrol engine has a carburettor…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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TThe venturi of a simple carburetor has a throat diar the coefficient of flow is 0.8. The fuel orifice has a and the coefflicient of fuel flow is 0.65. The gasolin surface is 5 mm below the throat, calculate * of 20 mm and er of 1.14 mm when the nozzle (i) the air-fuel ratio for a pressure drop of 0.0. tip is ne arted (ii) the aiaeDW atio when the nozzle tip is taken into account (iii) the minimum velocity of air or critical air velocity requi red to start the fuel flow when the nozzle tip is provided. Assume the density of air and fuel as 1.20 and 750 kg/m respectively.
A simple jet carburetor is required to supply 5 kg of ai and 0.5 kg of fuel per minute. The fuel specific gravity is 0.75. Thrnea'r is initially at 1 bar and 300 K. Calculate the throat diameter or ir choke for a flc ty ocity of 100 m/s. Velocite oefficient is 0.8. If the pressure drop acit 1 1he fuel metering orific orifice diameter assuming. Caf .60 and= 1.4. 80 of that of the choke. calculate
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Q3 Apetrol engine uses fuel of calorific value 44000 ki/hr and has specific gravity of 0.74.the brake thermal efficiency of the engine is 25 percent and mechanical efficiency 75 percent. If the engin develops 50kw. Calculate the fuel consumption in liters per hour efficiency. Answers [ 22.1 liters/hr y 33.3%] the indicated thermal
2- Diesel engine, six cylinders is tested at 4750 rpm, the pressure and temperature of the air entering the engine are 1.2bar, and 25 if the bore of cylinder is 80 mm and stroke 120 mm ,take air fuel ratio is 12:1, the specific fuel consumption is 0.52kg/kWh, and the brake power is equal 94 kW find the following: fuel consumption m'f = kg/ sec the air consumption engine capacity.: the flow rate of air intake to cylinder the Volumetric efficiency
The Venturi of a simple carburetor has a throat diameter of 25 mm and the coefficient of air flow is 0.87. The fuel orifice has a diameter of 1.35 mm and the coefficient of the fuel flow is 0.66. The petrol surface is 6 mm below the throat. Find (a) The air-fue ratio for a pressure drops of 0.07 N/m² when the nozzle tip is neglected. (b) The air-fuel ratio when the nozzle tip is taken into account (c) the minimum velocity of air or critical air velocity required to start the fuel flow when nozzle tip is provided. Take the density of air and fuel as 1.2 and 750 kg/m³ respectively.
Give short explantion.
Discuss Brayton and Rankine cycles
7. A four-stroke, 6-cylinder, 3.6 Itr SI engine, is designed to have a maximum speed of 6000 r.p.m with a volumetric efficiency of 92%. Apa 0.07 bar, C, = 0.85, Cf 0.6, fuel density is 700 %3D %3D = 1.03 bar, and AF 15. Calculate: (i) Throat diameter of the kg/m'. At sea level T 27°C, Pa carburetor. (ii) Fuel orifice area. (iii) AF at altitude of 2000 m
Q40 The venturi of a simple carburettor has a throat diameter of 35 mm and aid the coefficient of air flow is 0.85. The fuel orifice has a diameter of 2.3 mm and the coefficient of fuel flow is 0.66. The petrol surface is 5mm below the throat Find The air Fuel ratio for a pressure drop of 0.07 bar when nozzle lip is neglected. ⑥The air Fuel ratio when the nozzle lip is taken into account win wilt to tout The minimum velocity of air (critical air velocity) required to start The fuelut size flow when nozzle lip is provided. [used Approximate method Just Take density of air and fuel as 1.2 and 750 kg/m³ respectively) Enter APS Answers [a_11.93 b-11-96 c_7.83 m/sec ] 2-1 1920
4. to convert the kinetic energy of water into the mechanical shaft energy. Water enters the turbine, at the inlet, with the velocity Vin = 40m/s and the mass flow rate m=1,000kg/s. Water exits the Vi,z40ms turbine with a negligible velocity, say, Vout = 0 m/s.The efficiency of m - loooly/s Figure on the right shows a hydraulic turbine designed HzO HzO the turbine is 75 %. Potential energy and flow work can be ignored. 4а. Please calculate the specific kinetic energy of water entering the turbine ( ɛr or ke; in J/kg). 4b. Please calculate the rate of total kinetic energy of the water flow ( É̟ or KĖ ; in J/s or W) 4с. Please determine the mechanical power output of this turbine (Wou; in W or kW). 4d. Please determine how much mechanical energy would this turbine generate during an hour

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