9 A full load test on a two-stroke engine yielded the following results:speed 440 rpm; brake load 50 kg; imep 3 bar; fuel consumption 5.4kg/h; rise in jacket water temperature 36 °C; jacket water flow 440kg/h; air-fuel ratio by mass 30; temperature of exhaust gas 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; calorificvalue of fuel is 43 M.J/kg; proportion of hydrogen by mass in the fuel15%: R0.287 k.J/kg of mean specific heat of dry exhaust gases1 kJ /kg K; specific heat of dry steam 2 kJ/kg K. Assume enthalpy ofsuper heated steam to be 3180 k.J/kg. Determine.(i) the indicated thermal efficiency(ii) the specific fuel consumption in g/kW h(iii) volumetric efficiency based on atmospheric conditionsDraw up a heat balance for the test on the percentage basis indicatingthe balance.the content of cach item

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Answered: 9 A full load test on a two-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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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 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)
Q9: In a test on a two- stroke, heavy oil, marine engine, the following observations were made, Oil consumption, 4.05 kg; Calorific value of oil, 43000 kj/kg; het brake load 579N; Mean brake diameter, 1 m; mean effective pressure 275 kN/ m2; Cylinder diameter 0.20m; stroke, 0.250m; speed, 360 rpm. Icalculate o @ the mechanical efficiency the indicated thermal efficiency O Ihe brake thermal efficiency and The quantity of jacket water required per minute if 30% of the energy supplied by the fuel is absorbed by this waterPermissible rise in temperature is 20k and specific heat capacity of water=4.1868
The following data were obtained during a test of six cylinder otto cycle engine. Speed 2000 rpm, bore 3.5 in stroke 3.75 in, specific fuel consumption base on brake hp.66 lbs. / bhp-hr, brake arm 1.05 ft. HHV of fuel 20000 Btu/lb, Brake Torque 133 ft-lb, friction torque 40 ft-lb room temperature 90 F. barometric pressure 14.7 psia Find:a.) BHP=b.) BMEP=c.) IMEP=d.) IHP=e.) BRAKE THERMAL EFFICIENCY=f.) INDICATED THERMAL EFFICIENCY=
1.3 During the trial of a single acting oil engine, cylinder diameter is 20 cm, stroke 28 cm, working on two stroke cycle and firing every cycle, the following observations were made: Duration of trial :1 hour :4.22 kg :44670 kJ/kg Total fuel used Calorific value Proportion of hydrogen in fuel : 15% Total number of revolutions :21000 Mean effective pressure : 2.74 bar Net brake load applied to a drum of 100 cm diameter : 600 N Total mass of cooling water circulated : 495 kg Total mass of cooling water 13°C, outlet 38°C : inlet Air used : 135 kg : 20°C Temperature of air in test room Temperature of exhaust gases 370°C Assume Cp, gases = 1.005 kJ/kg K, Cp, steam at atmospheric pressure = 2.093 kJ/kg K Calculate thermal efficiency and draw up the heat balance.
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
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 The following observations are recorded during a test on a four-stroke petro engine, F.C = 25cc of fuel in 10 sec, speed of the engine is 2600 rpm, B.P = 22 kW, Qair 0.00134 m, piston diameter 90 mm, density of the fuel = 0.85gm/cc , compression ratio = 7.5, CV of fuel = 42000KJ/Kg, room temperature = 24 °C %3D = 140mm, stroke length = %3D %3D %3D 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.
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 Soyc 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 In solve to find mass of steam in exhaust gases m=(4.3/3600) *0.15 *9 Stroke length= 280 mm want clarification of the value 9 bleas Effective brake diameter= 1 m Calorific value= 43900 KJ/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 sheel on minute basis.
A crawler with 1.5 m diesel engine has the following information: Cost of equipment Shipping cost Unkoading &assembling at destination Engine Crankcase capacity 1lours between oil changes Operating factor Useful life, with no salvage value Hours operated per year Weight Cost of fuel per liter Cost of oil per liter Maintenance $82260 $2448 $220 160 hp 22.71 liter 100 hr 06 6 vears 2000 61700 kg 0.33 $/liter 0.53 S/liter 100% of Depreciation 12% of Average Valuc Investment 1- what is the initial capital cost of the crawler?
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.
(B) The following observations were recorded during a trial on à 4-slroke diesel Power absorbed by non-firing engine when driven by an electric motor 10 kW, speed of the engine 1750 rpm, brake torque = 327.4 Nm, fuel used = 15 kg/hr, calorific value of fuel 42000 kJ/kg, air supplied temperature of cooling water 65.8°C, temperature of exhaust gas = 400°C, room temperature 20.8°C, specific heat of water = 4.19 kJ/kg K, and specific heat of exhaust gas kJ/kg K. Determine : a) B.P, b) Mechanical efficiency, c) BSFC, and d) Draw up heat balance sheet on kW basis. ="4.75 kg/min, cooling water circulated =16 kg/min, outlet 1.25

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