The following details were noted in a test on a single-cylinder four-stroke oil engine: bore = 150 mm; stroke = 160 mm; speed of engine = 500 rpm; fuel consumption 0.0475 kg/min; calorific value of fuel = 42,000 kJ/kg; the difference in tension on either side of the brake pulley = 400 N; brake circumference 2.2 m; length of the indicator diagram = 50 mm; area of positive loop of indicator diagram 475 mm2; area of negative loop = 25 mm?; spring constant = 0.8333 bar per mm. Calculate: a) The Brake Power in kW b) The Indicated power in kW c) The mechanical efficiency

The following details were noted in a test on a single-cylinder four-stroke oil engine: bore = 150 mm; stroke = 160 mm; speed of engine = 500 rpm; fuel consumption 0.0475 kg/min; calorific value of fuel = 42,000 kJ/kg; the difference in tension on either side of the brake pulley = 400 N; brake circumference 2.2 m; length of the indicator diagram = 50 mm; area of positive loop of indicator diagram 475 mm2; area of negative loop = 25 mm?; spring constant = 0.8333 bar per mm. Calculate: a) The Brake Power in kW b) The Indicated power in kW c) The mechanical efficiency

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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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.
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.
As a mechanical engineer, you were asked by your supervisor to monitor the operation of 4-stroke engine; as a result you got the following readings: > Imep = 780 kN/ m2 > Engine speed = 800 rpm > Brake Power 30 kW %3D %3D > nm = 85 % > B/S 0.7 You noticed also, that the inlet valve opens 10° before TDC and closes40° after BDC and it takes 0.0035 second after ignition for the charge to gain maximum pressure. Depending on the above readings, find the following engine parameters: a. The crank angle when the spark occursfor the maximum pressure to be at TDC b. The time period in second of inlet valve opening during one cycle c. The diameter of the engine d. The average piston speed 1 Upload file
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.
1 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 cir- cuiting 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, me- chanical 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.
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=
The following data refers for the single cylinder 4 stroke diesel engine. The brake power is 73 kW and engine speed is 500 rpm. The break mean effective pressure is 8 bar and mechanical efficiency is 80 %. The BSFC of the engine is .30 kg/kWhr of the fuel calorific value of 43200 kJ/kg. Determine indicated thermal efficiency.
5 The following observations were recorded during a trial of a four-stroke, single-cylinder oil engine. Duration of trial is 30 min; oil consumption is 4 litres; calorific value of the oil is 43 MJ/kg; specific gravity of the fuel = 0.8; average area of the indicator diagram indicator diagram = 8.5 cm; spring constant = 5.5 bar/cm; brake load = 150 kg; spring balance reading = 20 kg; effective brake wheel diame- ter = 1.5 m; speed = 200 rpm; cylinder diameter = 30 cm; stroke 45 cm; jacket cooling water 10 kg/min; temperature rise is 36 °C. Calcu- late (i) indicated power (ii) brake power (iii) mechanical efficiency (iv) brake specific fuel consumption in kg/kW h and (v) indicated thermal efficiency. = 8.5 cm2; Length of the |3| %3D %3D
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.
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)
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 5.4 kg/h; rise in jacket water temperature 36 °C; jacket water flow 440 kg/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; calorific value of fuel is 43 M.J/kg; proportion of hydrogen by mass in the fuel 15%: R 0.287 k.J/kg of mean specific heat of dry exhaust gases 1 kJ /kg K; specific heat of dry steam 2 kJ/kg K. Assume enthalpy of super 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 conditions Draw up a heat balance for the test on the percentage basis indicating the balance. the content of cach item
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?