Q6: A single cylinder four-stroke diesel engine working on Dual combustion cyclehas a compression ratio of (15:1). The engine draws in air at (1 bar), (27 °C) and themaximum pressure in the cylinder is limited to (55 bar). If the heat transfer atconstant volume is twice that at constant pressure, determine (a) the constantvolume pressure ratio (b) the cut-off ratio, and (c) the thermal efficiency of the cycle.Assume Cp=1.005 Kj/Kg.K, C=0.718Kj/Kg.K and y=1.4. Ans (a) 1.24 (b) 1.07 (c) 66%

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Answered: Q6: A single cylinder four-stroke…

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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The Fifth Question: A six-cylinder, 4-stroke petrol engine develops 62 H.P at 3000 r.p.m. The volumetric efficiency at N.T.P. is 85%. The bore is equal to the stroke and thermal efficiency of 25 % may be assumed. Calorific value of petrol is 44100 kj/kg. Air-fuel ratio is to be 15:1. Calculate the cylinder bore and stroke.
A The compression ratio of a diesel cycle is 15.5, and the cutoff occurs at 10% of the stroke. 14 psia and 600 K characterize state 1. Calculate the following for the hot-air standard with k= 1.34 and a starting volume of 2 cu ft: Qin a. Find T2 , P2 , V2 , T3 , V3 , P4 , and T4 3 P = P, b. Compute the heat added (QA), Wout heat rejected (Qr), work (W) and the cycle efficiency (e). P. c. for a rate of circulation of 1000 cfm, Qout compute the horsepower.
(b) The pressure, volume and temperature at the beginning of compression of a four stroke petrol engine are 105kN/m²,0.0005m³ and 25°C respectively. The maximum temperature of the cycle is 1400°C. The volume ratio of the engine is 8:1. i) Calculate the mean effective pressure in the cylinder.
The stroke and cylinder diameter of a compression ignition engine are 250 mmand 150 mm respectively. If the clearance volume is 0.0004 ?^3 and fuelinjection takes place at constant pressure for 5 per cent of the stroke determinethe efficiency of the engine. Assume the engine working on the diesel cycle.
In a C.I. engine working on the dual combustion cycle the compression ratio is 12.5:1. Air at 101.3kPa and 35°C is compressed adiabatically. Fuel is then added until the pressure reaches 4000kPa, then at constant pressure to a temperature of 1425°C. After adiabatic expansion to the initial volume exhaust takes place. Calculate: (a). work done/kg air (b). thermal efficiency
Q3:A small truck has #cylinder ,4 liter compression ignition engine that operates on irstandard Dual cycle with air fuel ratio of 16:1, the compression ratio is 17 and the cylinderdiameter is 14.5Cm. At the start of compression stroke Ta=5O'C and Pa=100 kpa .It can beassumed the half of the heat input is added at constant volume and halt at constant pressureCalculate:-Temperature and pressure at each state of the cycle. -Indicated thermal efficiency.
1.4 A diesel engine operating an air standard diesel cycle has 20cm bore and 30cm stroke. the clearance volume is 420cm3. if the fuel is injected at 5% of the stroke, find the air standard efficiency. 1.5 Develop an expression for the thermal efficiency of the air-standard diesel cycle as a function of the compression ratio r. = V1V2 and the expansion ratio r, = V4 / V3. Assume the working fluid is an ideal gas, and the volume effect of moles of gas generated is small relative to the effect of heating from combustion. %3D
Consider a cylinder of a gasoline engine at the beginning of the compression cycle, duringwhich a fuel/air mixture (for our purposes mostly composed of nitrogen and oxygen, i.e.an ideal gas of diatomic molecules) at 300 K and 1 bar is compressed down to one-tenthvolume (compression ratio of 10:1). Assume that the compression is rapid so no heatexchange occurs with the environment. Calculate the pressure and the temperature ofthe compressed gas. In a diesel engine, the compression ratios are typically much higher;redo the same calculation with a compression ratio of 20:1.
A four-cylinder spark-ignition engine with a compression ratio of 8 has a pistonswith a bore of 9 cm and a stroke of 10 cm. The air pressure at the beginning of thecompression is 98 kPa, and the temperature is 37 oC. The engine may be modeled by theair-standard Otto cycle. The maximum cycle temperature is 1700 oK. If the engineproduces 75 kW of power, determine a) the heat supplied per cylinder; b) the thermalefficiency; and c) the rpm required.
(6) A small single-cylinder, two-stroke cycle SI engine operates at 8000 r.p.m. with a volumetric efficiency of (0.85). the engine is square (bore-stroke) and has a displacement 3 of 6.28 cm the fuel-air ratio FA=0.067 . calculate :- m (a) Average piston speed. sec (b) Flow rate of air into engine. kg sec (c) Flow rate of fuel into engine. (kg sec (d) Fuel input for one cycle. kg cycle (d) 4.22×10-7 ANS: (a) 5.33, (b) 0.00084, (c) 5.63×107
I need the answer as soon as possible
The compression ratio of an Otto cycle is 8, at the beginning of the zanthropic compression process, the pressure of the air is 100 kPa, the temperature is 27 "C, the volume is 550 cm. At the end of the lzantropic expansion process, the temperature of the air is 700 K. Using the specific temperature values at room temperature (according to the cold air standard assumptions) Find the gravity of the air.

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