Q18 An engine develops 50 kw at full load. If it's mechanical efficiency 80% whatis the friction power? What will be the mechanical efficiency of theildengine at half load, if the mechanical losses (friction) remain the same?Answers [12.5kW, 66.7%]

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Answered: Q18 An engine develops 50 kw at full…

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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Q18 An engine develops 50kw at full load. If its mechanical efficiency 80% what is the friction power? What will be the mechanical efficiency of the la engine at half load, if the mechanical losses (friction) remain the same ?> Answers [12.5kW, 66.7% 1 Noitelo?
2.) A four-cylinder, two-stroke cycle diesel engine with 10.9 cm bore and 12.6 cm stroke produces 88 kW of brake power at 2000 RPM. Compression ratio rc = %3D 18:1. (a) engine displacement in cm³, (b) brake mean effective pressure in kPa, (c) torque in N-m, (d) clearance volume of one cylinder in cm³.
Part (a) Find the efficiency of an ideal engine operating between these reservoirs. Remember the efficiency is unit-less, therefore so should your number be as well. ( Party a was incorrect can you try again ) Part (d) What if the actual work done (more realistically) is W = 290 J during a single cycle; what is the efficiency of this engine if the energy input is the same (again, the number should be unit-less)? Part (e) What is equation for the new power output per cycle (in Watts) of this new (and more realistic) engine?
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2 A six-cylinder 4-stroke cycle petrol engine is to be designed to develop 250 kW of (b.p) at 2200 rpm the stroke / bore ratio is to be 1.3:1. Assuming nm =80% and an indicated mean effective pressure of 9.5 bar, determine the required bore and stroke. If the compression ratio of the engine is to be 7.5 to 1, determine consumption of petrol in kg/h and in kg/bp.hr. Take the ratio of the indicated thermal efficiency of the engine to that of the constant volume air standard cycle as 0.65 and the calorific value of the petrol as; 44770KJ/kg.
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Q3 Apetrol engine uses fuel of calorific value 44000 ki/hr and has specific gravity of 0.74.the brake thermal efficiency of the engine is 25 percent and mechanical efficiency 75 percent. If the engin develops 50kw. Calculate the fuel consumption in liters per hour efficiency. Answers [ 22.1 liters/hr y 33.3%] the indicated thermal
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A four-cylinder, 2.4-liter engine operates on a four-stroke cycle at 3200 RPM. The compression ratio is 9.4:1, the connecting rod length r= 18 cm, and the bore and stroke are related as S = 1.06B. (a) clearance volume of one cylinder in cm³, (b) bore and stroke in cm, (c) average piston speed in cm/sec. (d) the piston speed when the crank angle 0 = 90° aTDC? (m/sec)

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Q18 An engine develops 50 kw at full load. If it's mechanical efficiency 80% what is the friction power? What will be the mechanical efficiency of theild engine at half load, if the mechanical losses (friction) remain the same? Answers [12.5kW, 66.7%]