Q-3: The air enters the compressor of an open cycle gas turbine at 1 bar and 20°C. The overall pressure ratio of the cycle is 4/1. The isentropic efficiencies of the compressor and turbine are 80% and 85% respectively. The air/fuel ratio used is 80/1 with a heating value of 41800 Ki/kg. The pressure drop in the combustion chamber is 0.11 bar and the combustion efficiency is 96%. The air flow rate is estimated to be 5 kg/s. Determine: Power output in kW. « Cycle thermal efficiency. Assume that the working fluid around the cycle has the properties C, = 1.10 ki/kg K and r=14 Four-stroke, single-cylinder diesel power unit when tested gave the following particulars: Brake power 9kW Rotational speed 250 pm Indicated mean effective pressure 0.46 MN/m? Mechanical efficiency 80% Bore/Stroke ratio 0.66 Calculate: o Engine displacement in cm’. o Cylinder bore in cm. Q-3: The air enters the compressor of an open cycle gas turbine at 1 bar and 20°C. The overallpressure ratio of the cycle is 4/1. The isentropic efficiencies of the compressor and turbineare 80% and 85% respectively. The air/fuel ratio used is 80/1 with a heating value of41800 kJ/kg. The pressure drop in the combustion chamber is 0.11 bar and thecombustion efficiency is 96%. The air flow rate is estimated to be 5 kg/s. Determine:• Power output in kW.• Cycle thermal efficiency.Assume that the working fluid around the cycle has the properties C, = 1.10 kJ/kg K andy= 1.4Q-4: Four-stroke, single-cylinder diesel power unit when tested gave the following particulars:Brake power9 kWRotational speedIndicated mean effective pressureMechanical efficiency250 rpm0.46 MN/m?80%Bore/Stroke ratio0.66Calculate:• Engine displacement in cm'.• Cylinder bore in cm.

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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Q-3: The air enters the compressor of an open cycle gas turbine at 1 bar and 20°C. The overall pressure ratio of the cycle is 4/1. The isentropic efficiencies of the compressor and turbine are 80% and 85% respectively. The air/fuel ratio used is 80/1 with a heating value of 41800 Ki/kg. The pressure drop in the combustion chamber is 0.11 bar and the combustion efficiency is 96%. The air flow rate is estimated to be 5 kg/s. Determine: Power output in kW. « Cycle thermal efficiency. Assume that the working fluid around the cycle has the properties C, = 1.10 ki/kg K and r=14 Four-stroke, single-cylinder diesel power unit when tested gave the following particulars: Brake power 9kW Rotational speed 250 pm Indicated mean effective pressure 0.46 MN/m? Mechanical efficiency 80% Bore/Stroke ratio 0.66 Calculate: o Engine displacement in cm’. o Cylinder bore in cm.

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