During a test on a 5-cylinder four-stroke IC dieselengine with a cylinder bore and stroke length of 240mm and 297 mm respectively, running at 468 r/min,the following results were obtained:Mass on Dynamometer mass hanger (arm length =0.825 m)205 kgIndicated mean effective pressure528 kPaFuel consumption (with Qnet,v = 39.8 MJ/kg,%3Ddensity = 0.944 kg/l)6 ml/sTake acceleration due to gravity as 9.81 m persquare secondsCalculate the brake thermal efficiency_ _in decimalform to 3decimal places.

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Answered: Calculate the brake thermal efficiency

Engineering

Mechanical Engineering

Calculate the brake thermal efficiency

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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During a test on a 4-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 268 mm and 312 mm respectively, running at 440 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 0.829 m) 208.6 kg Indicated mean effective pressure 481 kPa Fuel consumption (with Qnet,v = 39.8 MJ/kg, density = 0.944 kg/l) 6 ml/s Take acceleration due to gravity as 9.81 m per square seconds Calculate the mechanical efficiency in 3 decimal places.
A full load test on a two-stroke engine yielded the following results: speed 440 rpm; brake load 50 kg; imep 3 bar; fuel consumpt ion 5.4 kg /h; rise in jacket water temperat ure 36 °C; jacket water flow 440 kg /h; air-fuel ratio by mass 30; temper ature of exhaust gaa 350 °C; temperature of the test room 17 °C; baromet ric pressure 76 cm of Hg cylinder diameter 22 cm; stroke 25 cm; brake diameter 1.2 m; calorific value of fuel is 43 M.J /kg; propor tion of hydrogen by maas in the fuel 15%; R 1 kJ /kg K; specific heat of dry steam 2 k.J/kg K. Assume enthalpy of super heated steam to be 3180 kl/kg. Determine, 0.287 k.J/kg of mean specific heat of dry exhaust gases = %3D (i) the indicated ther mal efficiency (ii) the specific fuel consumption in g/kW h (iii) volumetric efficiency based on atmoepher ic condit ions Draw up a heat balance for the test on the percentage basis indicat ing the content of each item in the balance.
During a test on a 3-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 276 mm and 306 mm respectively, running at 547 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 0.815 m) 200.6 kg Indicated mean effective pressure 428 kPa Fuel consumption (with Qnet.v = 39.8 MJ/kg, density = 0.944 kg/l) 6 ml/s Take acceleration due to gravity as 9.81 m per square seconds Calculate the mechanical efficiency in decimal fraction to 3 decimal places, No unit needed for answer
During a test on a 4-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 242 mm and 313 mm respectively, running at 433 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 0.825 m) 205 kg Indicated mean effective pressure 418 kPa Fuel consumption (with Qnet, v = 39.8 MJ/kg, density = 0.944 kg/l) 6 ml/s Take acceleration due to gravity as 9.81 m per square seconds Calculate the brake thermal efficiency in decimal form to 3decimal places.
During a test on a 3-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 245 mm and 314 mm respectively, running at 448 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 0.798 m) 217.7 kg Indicated mean effective pressure 445 kPa Fuel consumption (with Qnet,v = 39.8 MJ/kg, density = 0.944 kg/l) 6 ml/s Take acceleration due to gravity as 9.81 m per square seconds Calculate the mechanical efficiency in decimal fraction to 3 decimal places.
During a test on a five-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 260 mm and 305 mm respectively, running at 503 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 0.825 m) 221.9 kg Indicated mean effective pressure 400 kPa Fuel consumption (with Qnet,v = 39.8 MJ/kg, density = 0.944 kg/l) 6 ml/s Take acceleration due to gravity as 9.81 m per square seconds Calculate the brake power .
During a test on a 4-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 317 mm and 307 mm respectively, running at 481 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 0.825 m) 205 kg Indicated mean effective pressure 403 kPa Fuel consumption (with Qnet,v = 39.8 MJ/kg, density = 0.944 kg/l) 6 ml/s Take acceleration due to gravity as 9.81 m per square seconds Calculate the brake thermal efficiency in decimal form.
During a test on a five-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 260 mm and 305 mm respectively, running at 435 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 0.825 m) 206.1 kg Indicated mean effective pressure 400 kPa Fuel consumption (with Qnet y = 39.8 MJ/kg, density = 0.944 kg/l) 6 ml/s Take acceleration due to gravity as 9.81 m per square seconds Calculate the brake power. add unit but not in kilos
During a test on a 3-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 261 mm and 315 mm respectively, running at 482 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 0.83 m) 224.8 kg Indicated mean effective pressure 444 kPa Fuel consumption (with Qnet v = 39.8 MJ/kg, density = 0.944 kg/l) 6 ml/s Take acceleration due to gravity as 9.81 m per square seconds Calculate the indicator power to 2 decimal places, add unit to answer but not in kilos.
During a test on a 5-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 271 mm and 309 mm respectively, running at 507 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 0.814 m) 221.2 kg Indicated mean effective pressure 321 kPa Fuel consumption (with Qnet,v = 39.8 MJ/kg, density = 0.944 kg/l) 6 ml/s Take acceleration due to gravity as 9.81 m per square seconds Calculate the indicator power to 2 decimal places.
During testing of single cylinder two-stroke petrol engine following data were obtained. Brake torque = 640 Nm, cylinder diameter 21 cm, speed 350 rpm, stroke length = 28 cm, mean effective pressure = 5.6 bar, oil consumption = 8.16 kg/h, calorific value of the fuel = 42,705 kj/kg. Determine: Srake thermal efficiency
ENGINE SPECIFICATIONS: Engine Type : Four cylinder Four stroke Diesel engine, Bore: 0.073m, Stroke: 0.0889m Capacity: 1489cc, Power: 36 H.P. at 4000 rpm, Torque : 8.5 kg.m at 2250 rpm and Compression Ratio :17.3:1 Explain how to measure the :- (i) Fuel consumption. (ii) (iii) Manometer readings for air flow. RPM, power output etc. Study of various components of diesel engine.