5. A Gasoline (otto) engine develops 67 kw brake power and operates on 0.052 kg/s of air (R = 0.287 kJ/kg) atintake temperature of 333 K, compression ratio of 8.7, combustion temperature of 6580 K, and k = 1.32 for hotair. The brake thermal efficiency is,a 25%b 20%c 22%d 24.3%

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Answered: 5. A Gasoline (otto) engine develops 67…

Automotive Technology: A Systems Approach (MindTap Course List)

6th Edition

ISBN:9781133612315

Author:Jack Erjavec, Rob Thompson

Publisher:Jack Erjavec, Rob Thompson

Chapter9: Automotive Engine Designs And Diagnosis

Section: Chapter Questions

Problem 1RQ

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2. A four-cylinder 2.5 L spark-ignited engine is mounted on a dyno and operated at a speed of W=3000 rpm. The engine has a compression ratio of 10:1 and mass air--fuel ratio of 15:1. The inlet air manifold conditions are 80 kPa and 313 K. The engine produces a torque of 160 Nm and has a volumetric efficiency of 0.82. (a) What is the brake power Wb (kW)? (b) What is the brake specific fuel consumption bsfc (g/kWh)?
a. What is the specific brake work (kJ/kgfuel) of a 4 L single-cylinder propane engine operating stoichiometrically, if the heat transfer to the coolant is 17 kW, the air and fuel enter the engine at 298 K, the exhaust is 700 K, and the propane mass flow rate is 1.2 g/s? b. A four-stroke 6 L engine is fueled lean with methane at an equivalence ratio ? = 0.8. It operates at 2000 rpm with a volumetric efficiency of 0.80. The exhaust temperature is 800 K, and the heat transfer to the coolant is 3.4 ×105 kJ/kmolfuel. What is the engine’s thermal efficiency and power?
The Brake Specific Fuel Consumption of an Otto engine (typical of a gasoline engine) is 0.281 kg .mechanical efficiency is 91 %, Dkw hr compression ratio is 11.5, Higher Heating Value of the fuel is Determine the indicated kg fuel engine efficiency. 32.85 % 36.1 % 57.9 % 62.35 %
3 (4) A 1500 cm four-stroke cycle, four cylinder CI engine, operating at 3000 r.p.m. produces 48 kW of brake power. volumetric efficiency is 0.92 and air-fuel ratio AF 21:1. calculate :- (a) rate of air flow into engine. kg sec (b) Brake specific fuel consumption. (c) Mass rate of exhaust flow. kg hr gm kW.hr kW (d) Brake output per displacement. L ANS: (a) 0.0407, (b) 145.5, (c) 153.5, (d) 32
Fuel consuption of a engine is 0.35 kg/ KW-hr and heating value of fuel is 43000 KJ/kg. The brake thermal elliciency is (a) 20.1% (b) 23.9% (C) 28.29% (d) 32.21%
The relative efficiency of a engine will be equal to if air standard efficiency & brake thermal efficiency of engine are 53.4% & 24.4% respectively. (a) 40.7% (B) 13.1% (C) 45.7% (d) 53.4%
Q1. (a) Discuss the factors that have to be considered in the design of an engine cylinder. (b) The pressure, volume and temperature at the beginning of compression of a four stroke petrol engine are 105kN/m²,0.0005m³ and 25°C respectively. The maximum temperature of the cycle is 1400°C. The volume ratio of the engine is 8:1. i) Calculate the mean effective pressure in the cylinder. ii) The brake power produced by the engine is 60kW at a speed of 5200 r.p.m. If the Mechanical efficiency of the engine is 82%, determine the size of the cylinder bore and length. iii) Estimate the thickness of the cylinder head to support the gas load present in the engine cylinder. Assume the material has a tensile stress of 42N/mm². (c) Discuss the nature of the stresses present in the cylinder walls.
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Engine Type: Single cylinder Four stroke Diesel engine, Bore: 0.0875m, Stroke: 0.11m Capacity: 661.5 cc, Power: 6 H.P. at 1500 rpm, Torque: 2.96 kg.m at 1500 rpm and Compression Ratio :17.5:1 Explain how to measure the :- Fuel consumption. Inclined manometer readings for air flow. RPM, power output etc. (iv) Study of various components of diesel engine. (ii)
The friction mean effective pressure: Select one: O a. Decreases when the engine rotational speed increase O b. Increases when the engine rotational speed increase O c. No influence of rotational speed on fmep O d. Increases when the engine rotational speed decrease
Briefly explain the determination of gas pressure excitations in a 4-stroke engine.
What is meant by abnormal combustion in Si engine ? Discuss the various factors which affect abnormal combustion requirements

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