Q In a test on a two.. strok, heavy oil, marine engine, the following observations weremade: Oil consumption, 4.05 kg/h; Calorific value of oil, 43000kj/kg; het brakeload 579N; Mean brake diameter, 1m; mean effective pressure 275 kN/m²; cylinder diameter0.20m; stroke, 0.250m; speed, 360 rpm.Calculatethe mechanical efficiency the indicated thermal efficiency YThe brake thermal efficiency and the quantity of jacket water required perمسموح بهامتصتminute if 30% of the energy supplied by the fuel is absorbed by this water.Permissible rise in temperature is 20k and specific heat capacity of water-4.1868 kjAnswers [84.2%, 26-8%, 22.6%, 8.33 kg/min]kg.kعماد داود عبود

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Answered: Q In a test on a two.. strok, heavy…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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.
3. A 4-stroke, 8-cylinder, petrol engine, has the following parameters at sea level; fue consumption = 0.75 Itr/min, engine speed = 50 r.p.s., Ap = 60 mm Hg, venturi diameter = 4 cm, atmospheric pressure = 1.03 kg/cm', C, 0.8, air and fuel densities are 1.15 kg/m' and 700 kg/m' respectively. Calculate: AF when the temperature decreases by 10%.
- An engine user 6.5 Kg of oil per hour of calorific value 30000 kJ/kg. If the Bp of the engine in 22 kw and mechanical efficiency 85%, calculate. (i) Indicated thermal efficiency. (ii) Brake thermal efficiency (iii) Specific fuel consumption in kg/Bp/hr
Q3) The following reading was taken from the performance test of single cylinder four-stroke engine with 250 mm bore and 400 mm stroke: indicated mep 7.5 bar, engine speed 250 rpm, net load on the brake 1080 N, effective diameter of the brake 1.5 m, fuel used per hour 10 kg, calorific value of the fuel 44300 kK/kg. calculate : (1) Indicated power (2) Brake power (3) Mechanical efficiency (4) Indicated thermal efficiency State any necessary assumptions for your analysis. 1)
Engine Type Four cylinder Four stroke Diesel engine, Bore: 0.073m, Stroke: 0.0889m Capacity: 1489cc, Power: 36 H.P. at 4000 rpm, Torque : 8.5 kg.m at 2250 rpm and Compression Ratio :17.3:1 Explain how to measure the :- (i) Fuel consumption. (ii) (iii) RPM, power output etc. (iv) Study of various components of diesel engine. Manometer readings for air flow.
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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.
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.
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?
03/ A 4 cylinder has a following data Bore-15 cm; Piston speed 510 m/min; B.P= 60 kW; T0.80; Pa-5 bar; C.V=40000KJ/kg. Calculate i) whether this is 2 Stroke or 4 Stroke engine and why? 04/ Write a notes on heat balance sheet, draw that on the energy flow and enhance your answers with equations.
Q3: You are designing a four-stroke cycle diesel engine to provide a brake power of 300 kW naturally aspirated at its maximum rated speed. Based on typical values for bmep and maximum mean piston speed, estimate the required engine displacement, bore and stroke for sensible cylinder geometry, also find the number of engine cylinders. What is the maximum rated engine speed (rev/min) for your design? What would be the brake torque (N-m) and the fuel flow rate (g/hr) at this maximum speed? Assume a maximum mean piston speed of 12 m/s is typical of good engine designs.
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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