9. The following data were obtained during a test of a six-cylinder four-stroke Otto-cycle engine: speed, 2000 rpm; bore, 3.5 in.; stroke, 3.75 in.; specific fuel consumption based on the brake horsepower, 0.66 lb per bhp-hr; brake arm, 1.05 ft; heating value of fuel, 20,000 Btu per lb; brake torque, 133 ft-lb; friction torque, 40 ft-lb; room temperature, 90 F; barometer, 27.50 in. mercury. Find (a) brake horsepower, (b) brake mean effective pressure, (c) indicated horsepower, (d) indicated mean effective pressure, (e) brake thermal efficiency, and (f) indicated thermal efficiency.
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An eight-cylinder, four-stroke engine of 9 cm bore and 8 cm stroke with a compression ratio of 7 is tested at 4500 rpm on a dynamometer which has a 54 cm arm. During a 10-minute test, the dynamometer scale reading was 42 kg and the engine consumed 4.4 kg of gasoline having a calorific value of 44000 kJ/kg. Air temperature is 27 °C and air is supplied to the carburetor at a rate of 6 kg/min. Find the brake power delivered, the brake mean effective pressure, the brake specific fuel consumption, the brake specific air consumption, the brake thermal efficiency, the volumetric efficiency, and the air-fuel ratio.
Madhur L.
'An eight-cylinder, four-stroke engine of 9 cm bore and & cm stroke with a compression ratio of 7 is tested at 4500 rev/min on a dynamometer which has 54 cm arm: During a 10 minutes test the dynamometer scale beam reading was 42 kg and the engine consumed 4.4 kg of gasoline having calorific value of 44000 kllkg: Air at 278C and bar was supplied to the carburettor at the rate of 6 kglmin. Take R for air = 287 kJkg K) Find: the brake power delivered (bp), the brake mean effective pressure (bmep), the brake specific fuel consumption (bsfc), G the brake specific air consumption (bsac) the brake thermal efficiency nb, th) , the volumetric efficiency nvol) , and the air-fuel ratio (A/F) on mass basis. Draw the simplified schematic diagram of the plant showing all the necessary data dis- played on it:'
Sri K.
During a test of a four-stroke cycle, 6-cylinder engine having a piston displacement of 216.5 cubic inches at 1600 rpm, 1.05 lb of fuel were consumed in 2.45 minutes, the torque produced was 153 ft-lb, the friction torque was 24.45 ft-lb, and the engine stroke was 5 inch. Calculate: A) Brake horsepower B) Friction Horsepower C) Brake specific fuel consumption D) Brake mean effective pressure E) Mechanical efficiency F) Thermal efficiency if the Higher Heating Value of the fuel was 18,500 Btu/lb
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