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- a) Explain what do these terms mean: fmep, mfmep, pmep, amep, imep, bmep b) Write the equation relating fmep to mfmep, pmep, and amep; c) Write the equation relating fmep to imep and bmep; d) At a given engine speed, the following parameters are obtained as follows: 1600 bmep kPa 228.45 fmep kРа 124.38 mfmep kPa 29.52 amep kРa Calculate the net indicated mean effective pressure at the same engine speed.Q4: what is the difference between Wn and Wd?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%.
- Differantial EquationsQ4) Choose the true answer of the following questions : (1) The engine speed is measured using....... (a) viscous-flow air meter. (b) dynamometer (b) air box method (d) tachometer (2) The crank shaft is connected to the piston by....... (a) fuel injector (b) connected rod (c) camshaft (d) valves (3) The brake power is (a) less than indicated power (b) more than indicated power (c). eqaul to the indicated power (4) Two-stroke engines have (a) valves (b). ports instead of valves (c). none of them (5) ....... is a mechanical device used to cool a gas after compression. (a) cylinder (b). supercharger (c) intercoole (d) dynamometerFig.1 shows the diesel engine cycle. It is very similar to the Otto cycle (presented in thetextbook), but with two important differences. First, the fuel is not added until the air is fully compressed at point 2.This is because at the end of adiabatic compressionthe fuel begins to burn spontaneously (there are no spark plugs in a diesel engine).Second, combustion occurs more slowly and with the fuel being injected continuously.This characterizes the ignition stage as a constant pressure process. The cycle shown inFig.1 has an expansion Vmax - Vmın of 1000 cm^3and compression ratio r = Vmax/Vmın = 21.These are typical values for a diesel-powered truck. The engine operates with air intake(γ = 1, 4) at 25°C and 1 atm. The amount of fuel injected into the cylinder has a heat ofcombustion of 1000 J.a. Find the value of p, V, and T, for each of the vertices of the cycle. Finally, arrange yourresult in a table format.b. What is the total work done by the cylinder in one complete cycle?c. What…
- 2) 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 = 1.06*B). Calculate: a) Clearance volume of one cylinder in cm' & L b) Bore and stroke in [cm & in] c) Average piston speed in "THERMODYNAMICS UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS/DIAGRAMS LEGIBLY. NO LONG EXPLANATION NEEDED. USE 3 DECIMAL PLACES. BOX THE FINAL ANSWER. A pump discharges into a semi spherical tank at the bottom and cylindrical on top with a radius of 2 meters, and a total tank height of 8 meters. The flow rate is 80 gallons per minute and fluid specific gravity= 1.1. Determine the following: D.) how many drums will be needed to transfer all of the tank contents (tank being full) to the drums?Specific fuel consumption of a four-stroke internal combustion engine at a given rotational speed is 0.322 kg/kW-h value is minimum. Spindle power at this rotation rate is 123 kW, volumetric efficiency is 95% and air-fuel rate is 15. The number of rotations of this engine is calculated by subtracting 1.5 from the number of rotations giving the minimum specific fuel consumption. time, spindle power 162 kW, specific fuel consumption 0.394 kg/kW-h and volumetric efficiency 85%. a) Calculate the air-fuel ratio in this case. and By what percent has the efficiency of the engine changed?
- THERMODYNAMICS UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS/DIAGRAMS LEGIBLY. NO LONG EXPLANATION NEEDED. USE 3 DECIMAL PLACES. BOX THE FINAL ANSWER. A pump discharges into a semi spherical tank at the bottom and cylindrical on top with a radius of 2 meters, and a total tank height of 8 meters. The flow rate is 80 gallons per minute and fluid specific gravity= 1.1. Determine the following: A) flow rate in kg/sec and time it takes to fill the tank in hours. Flow Rate and Time2. For Pump Omicron, the pump performance data is shown in Table 2 below. Plot a curve of best fit Havailable versus Q from 0 Lpm to 30 Lpm. State the equation represented by the curve. On the same graph, plot the Hrequired versus Q and indicate the operating point. Table 2: Pump Omicron performance data Q (LPM) H (m) 0 46.5 46 42 37 29 16.5 0.0 5 10 15 20 25 30THERMODYNAMICS UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS/DIAGRAMS LEGIBLY. NO LONG EXPLANATION NEEDED. USE 3 DECIMAL PLACES. BOX THE FINAL ANSWER. A pump discharges into a semi spherical tank at the bottom and cylindrical on top with a radius of 2 meters, and a total tank height of 8 meters. The flow rate is 80 gallons per minute and fluid specific gravity= 1.1. Determine the following: A) flow rate in kg/sec and time it takes to fill the tank in hours. B) the weight in tons of the liquid if full tank local gravity is 32.1 ft/sec squared. C) volume of the tank in metric gallons. D.) how many drums will be needed to transfer all of the tank contents (tank being full) to the drums?