Q48 A single cylinder four-stroke diesel engine having a swept volume of8.50 cm³ is tested at 300 r.p.m. When a braking torque of 50 N·m isapplied, analysis of an indicator diagram gives a mean effective pressure of10 bar. Calculate the brake power and mechanical efficiency of the engine.Answers [b.p=1.57kw ; 7m = 73.1%]

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Answered: Q48 A single cylinder four-stroke…

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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The following data are the results on a test of an Otto cycle engine: Torque= 1300N-m. Indicated mean effective pressure= 800kpa, Fuel consumption=0.004kg/sec Fuel heating value=43,816KJ/kg Bore and stroke= 30cm x 32cm Speed= 400rpm. Calculate the brake mean effective pressure in kpa.
Q78 A four Cylinder, four stroke Petrol engine has a Compression ratio of 6 to1. A test on this engine gave the following resultsg Net brake load = 20kg, effective brake arm = 0.5 m, indicated mep =6alo N/m, engine speed 2400 rpm, %3D fuel consumption = lo kg /h, calorific value of the fuel = 44000 kj (kg, Cylinder bore 86 mm, engine stroke -l00 mm. Calculates @the mechanicalefficiency the brake thermal efficiency the relative efficiency assuming the engine works on the Constant volume cycle and that 8 - 1,4forair The brake mean effective pressure.
5. A dynamometer test was done for one hour at steady load on a 6 cylinder dieselengine. It was found to use 42 kg of fuel having Qh = 42,000 J/g. Cylinder is 22.8 cm x27.2 cm, four cycle type. Speed is 550 rpm and dynamometer torque at 27000 kg-cm.Determine the brake thermal efficiency
A six-cylinder two-stroke automotive engine has been designed to provide a maximum brake torque of (3.30x10^2) Nm at rated engine speed of (5.000x10^3) rpm. The engine specifications are listed below: Bore and stroke (mm): (8.4000x10^1) x (9.2000x10^1) Compression ratio: 11.0: 1 Find its brake mean effective pressure (bmep). The answer should be in kPa with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer
3. The following data were noted for a four-cylinder, four-stroke engine: Diameter = 101 mm, stroke = 114 mm, speed = 1,600 rpm, fuel consumption = 0.204 kg/min, %3D heating value of fuel = 41,800 kJ/kg. Difference in either side of the brake pulley = 378 N, brake circumference = 3.35 m. Assume mechanical efficiency = 83%. Calculate (i) brake thermal efficiency, (ii) indicated thermal efficiency, (iii) mean effective pressure of cylinder, and (iv) fuel consumption per brake power.
Q1. During a test on a two stroke diesel engine on full load the following observations were recorded: Speed= 350 rpm Net brake load= 590 N Mean effective pressure= 2.8 bar Fuel consumption=4.3 kg/h Jacket cooling water= 500 kg/h Temperature of jacket water at inlet and outlet= 25°C and 509C respectively Air used per kg of fuel= 33kg Temperature of air in test room= 25°C Temperature of exhaust gases= 400°C Cylinder diameter= 220 mm Stroke length= 280 mm Effective brake diameter= 1 m Calorific value= 43900 KI/kg Proportion of hydrogen in fuel= 15% Mean specific heat of dry exhaust gases= 1.0 KI/kg K Specific heat of steam= 2.09 KJ/kg K Calculate: (1) indicated power (2) brake power (3) draw up heat balance sheet on minute basis.
1. A four stroke diesel engine gave the following test results at a speed of 450 RPM. Mean effective pressure - 850 kPa Cylinder bore - 22 cm. Stroke - 26 cm. Specific fuel consumption - 0.32 kg/BHP.hr Calorific value of fuel – 45000 kJ/kg. Mechanical Efficiency = 88% Determine the (a) BHP, (b) IHP, (c) Indicated themal efficiency, and (d) Brake thermal efficiency.
A four stroke diesel engine has the following specifications: Brake power = 8 kW Speed = 2000 r.p.m Indicated mean effective pressure = 0.35 N / mm^2 Mechanical efficiency = 80 %. Determine: 1. bore and length of the cylinder 2. 2 thickness of the cylinder head 3. size of studs for the cylinder head.
A four-stroke automotive engine has been designed to provide a maximum brake torque of (1.900x10^2) Nm at rated engine speed of (5.300x10^3) rpm. The engine specifications are listed below: Bore and stroke (mm): (7.60x10^1) x (8.5000x10^1) Compression ratio: 11.0 : 1 Estimate the maximum brake power the engine will deliver. The answer should be in kW with three significant figures.
19.5 A diesel engine uses 30 lbm of fuel per hour (3.8 g/s) when the brake output is 75 hp. If the heating value of the fuel is 19,600 Btu/lb (45 600 kJ/kg), what is the brake thermal efficiency of the engine?
A four-stroke automotive engine has been designed to provide a maximum brake torque of (1.900x10^2) Nm at rated engine speed of (5.200x10^3) rpm. The engine specifications are listed below: Bore and stroke (mm): (7.5000x10^1) x (8.10x10^1) Compression ratio: 11.0: 1 Estimate the maximum brake power the engine will deliver. The answer should be in kW with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer
During a test on a 5 cylinder four stroke IC diesel engine with a cylinder bore and stroke length of 267 mm and 293 mm respectively, running at 436 rpm, the following results were obtained: Mass on dynamometer mass hanger(arm length=0,823 m)=219,7 kg, indicated mean effective pressure=452 KPa, fuel consumption(with Qnet=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: 1.the indicator power to 2 deimal places(not in kilos unit) 2.the brake thermal efficiency and mechanical efficiency in decimal form to 3 decimal places. 3. the brake power( not in kilos)

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