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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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.
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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.
A gasoline engine working on four-stroke develops a brake power of 20.9 kW. A Morse Test was conducted on this engine and the brake power (kW) obtained when each cylinder was made inoperative by short circuiting the spark plug are 14.9, 14.3, 14.8 and 14.5 respectively. The test was conducted at constant speed. Find the indicated power, mechanical efficiency and bmep when all the cylinders are firing. The bore of the engine is 75 mm and the stroke is 90 mm. The engine is running at 3000 rpm.
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The following particulars refer to a 4-cylinder, 4-stroke petrol engine; Bore= 65 mm, Stroke length = 95 mm, Torque developed = 64 Nm when engine turns 3000 rev/min, Clearance volume = 63 cm3 for each cylinder, Relative efficiency = 0.5 and Calorific value of petrol = 42000 kj/kg. Make calculations for brake mean effective pressure and the fuel consumption in kg/hr.

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