The rotational angle during flame propagation is from 12° BTDC to 12 aTDC, for an engine running at 1800 rpm.find the time of flame propagation?Select one:O a. 0.00204 secO b 0.0042 secOc 0.0022 secO d. 0.00304 secFind the ratio of exhaust valve area to intake valve area if the intake air temperature is 107" C and exhaust gases temperature is 537" C, assume k=1.35, R= 287 J/kg k.Select one:O a. 0.76Ob. 0.45Oc0.64O d. 0.685 If the mass flow rate of air entering the carburetor is 0.2 kg/s, assuming the discharge coefficient of the throat is 0.9, find the throat diameter?Select oneO a. 0.0237 mO b 0.3 mOc 0.0346 mO d. 0.32 mNext finge

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Answered: The rotational angle during flame…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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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
Q2 An automotive engine has a bore of 90 mm; the stroke is 110 mm; and the length of the connecting rod is 166 mm Knowing that the volume of the combustion chamber is 75 cm³ and the intake valve closes 18° crank angle degree after BDC. If injection Started 10 degrees before TDC and ends 40 degree after TDC. And the engine is running at 3000 rpm. a. Calculate the geometrical compression ratio and the actual compression ratio? b. Find the ratio between the maximum speed of the piston to the mean piston speed for this engine? c. Find the injection period
E Determine the ideal efficiency of the diesel engine having a cylinder with bore 250 mm, stroke 375 mm and a clearance volume of 1500 cc, with fuel cut-off occurring at 5% of the stroke. Assume 1.4 for air. %3D
30
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.
Powerplant:
An automobile carburettor having its flost chamber vented to the atmosphere is tested. at sea level conditions in the factory without air cleaner. The main metering system of this carburettor is found to yield a fuel-air ratio of 0.065. The venturi throat pressure is 0.85 bar. The carburettor is now installed in an automobile and air cleaner is placed on the inlet to carburettor. The air flow rate with or without air filter is 230 kg/hr. The pressure drop through the filter is found to be 0.035 bar at sea level conditions. vesuming 7 and orifice coefficient to be constant calculate: The ventues throat pressure with air cleaner. (n) Air-fuel ratio with air cleaner.
7.6 A carburetor, tested in the laboratory has its float chamber vented to atmosphere. The main meter is Iystem is adjusted to give an air-fuel ratio of 15:1 at sea level con ce s The pressure at the venturi throat is 0.8 bar. The atmospherie fie rsure is 1 bar. The same carburetor is tested again when an air eleaner is fitted at the inlet to the carburetor. The pressure drop to air cleaner found to be 30 mIi of Hg when air flow at sea level condition is 2 e coellicient of flow, caleulate (1) !, claroat pressush is fitted and (ii) air fuel rat io when the air cleaner i fitted. Assumingn dp and constant a the air cleaner
1 A six-cylinder, gasoline engine operates on the four-stroke cycle. The bore of each cylinder is 80 mm and the stroke 100 mm. The clearance volume per cylinder is 70 cc. At a speed of 4000 rpm the fuel consump- tion is 20 kg/h and the torque developed is 150 Nm. Calculate (i) the brake power (ii) the brake mean effective pressure (iii) brake thermal efficiency if the calorific value of the fuel is 43000 kJ/kg and (iv) the relative efficiency on a brake power basis assuming the engine works on the constant volume cycle. y = 1.4 for air.
In a 4 stroke single cylinder engine clearance volume (Vc) is 30 cm3 and displacement volume (Vd) is 290 cm3. The piston bore is 60 mm. Intake valve is opened at an angle of 25 ᵒ CA before Top Dead Center (TDC) and is closed at an angle of 20 ᵒ CA after the Bottom Dead Center (BDC). Calculate effective compression ratio.
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.
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The rotational angle during flame propagation is from 12° 6TDC to 12° aTDC, for an engine running at 1800 rpm. find the time of flame propagation?