B) A petrol engine of compression ratio 6 uses a fuel of calorific value 43950kJ/kg. The air - fuelratio is 15:1. The temperature and pressure of the charge at the charge at the end of the suction strokeare 60°C and 1bar. Determine the maximum pressure in the cylinder if the index of compression is 1.32and the specific heat at constant volume is expressed by the expression; C, = 0.71 +19 × 10TkJ/kgK, where T is the temperature in K - Compare this prby axith that ushen constant specific heat f = 0.72is used.

Given data as per questionCalorific value of fuel =43950 kj/kgFuel ratio =15:1Compression index…

Answered: B) A petrol engine of compression ratio…

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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Ex 1: A petrol engine of compression ratio 6 uses a fuel of calorific value43950kJ/kg. The air – fuel ratio is 15:1. The temperature and pressure of the charge at the charge at the end of the suction stroke are 60°C and 1 bar. Determine the maximum pressure in the cylinder if the index of compression is 1.32 and the specific heat at constant volume is expressed by the expression; C, = 0.71 + 19 x 10°T kJ/kg K, where T is the temperature in K. Compare this value with that when constant specific heat C, 0.72 is used.
The pressure ratio during the constant volume portion of combustion in a Dual Combustion engine is 1.89 . If the pressure at the end of the constant volume addition of heat is 4.49 , what is the pressure at the beginning?
A petrol engine is supplied with fuel having calorific value 48,000 kJ/kg. The presures in the cylinder at 5% and 70% of the compression stroke are 1.1bar and 4.5bar resectively. Assume that the compression follows the law pV^1/γ = constant. Find the compression rats of the engine. If the relative efficiency of the engine compared with the air standard efftiency is 65%, calculate the specific fuel consumption in kg/kWh
7. An oil engine has a swept volume of 55 l and compression ratio of 12:1. The and temperature of the charge in the cylinder at the beginning of the pressure compression stroke are 0.1 MN/m? and 60 °C respectively. Assuming the compression curve follows the equation PV!-.3=C. Determine the pressure and temperature at the end of compression. If the maximum temperature reached at the end of combustion, which may be assumed to take place at constant volume, is not exceed 1500°C estimate the mass of fuel required per cycle. Neglected all losses of energy and the increase in the mass of the charge due to the injected fuel. The calorific value of the fuel is 43.6Mj/kg. For the charge take R=0.29kJ/kgK and cv=0.72kJ/kgK. (2.53MPA, 427°C, 1.09g)
The in-cylinder pressure of an engine has been measured at both TDC and BDC, which are P1 = (1.000x10^0) bar at BDC and P2 = (5.000x10^1) bar at TDC. Given that the compression polytropic index is (1.35x10^0), find the compression ratio of the engine.
A six-cylinder automobile engine has cylinders with a bore of 2.5 inches, astroke of 2.25 inches, and a clearance volume (per cylinder) of 1.6 cubic inches.Determine the engine displacement and the compression ratio for this engine
- In a petrol engine the pressure in the cylinders at 30% and 70% of the compression strokes are 1.30 bar and 2.60 bar respectively. Assuming that the Compression follows the law PV1.33 = constant.
The compression ratio of a compression-ignition engine is 13.5 to 1. The diameter of the cylinder is 505mm and the stroke to bore ratio is 1.21 to 1. At the beginning of the compression, the pressure and the temperature of the air in the cylinder is 105 Kpa and 51C, and compression follows the law PVn =C where n=1.33. Determine the following:1.1) The temperature at the end of compression 1.2) Volume at the beginning of compression 1.3) The mass of air inside the cylinder 1.4) Evaluate whether the work is done on or done by the air?
Q2 An automotive engine has a bore of 90 mm; the stroke is 110 mm; and the length of the connecting rod is 166 mm Knowing that the volume of the combustion chamber is 75 cm³ and the intake valve closes 18° crank angle degree after BDC. If injection Started 10 degrees before TDC and ends 40 degree after TDC. And the engine is running at 3000 rpm. a. Calculate the geometrical compression ratio and the actual compression ratio? b. Find the ratio between the maximum speed of the piston to the mean piston speed for this engine? c. Find the injection period
2- An internal combustion engine has a bore of 200 mm and stroke of 380 mm. The clearance volume is 0.003 m’. Determine the air standard efficiency and indicated thermal efficiency , taking y = 1.4 and an efficiency ratio is 60%.
There are two double-acting pneumatic actuators, the extension of each one is executed in 5 seconds at 80 psi and recoil in 4 seconds at 30 psi, the travel of both is 12 inches, the diameter of the piston is dp = 4 "and of the rod dv = 1"a) Determine the compression ratios. The local atmospheric pressure is 79kpa = (11.5 psi)b) Determine the air consumption in cubic feet per minute of free air PCMc) Determine the average air consumption for each.d) Propose the regulation values of the pressure switch, system pressure and safety valve
Answer the problem correctly and provide complete and readable solutions. If you can explain the process (briefly), please do so. Thank you!

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