Which statement(s) is/are TRUE about compression-ignition (CI) engine?OThe maximum indicated mean effective pressure of a naturally aspiratedcompression-ignition engine is higher than the corresponding values for anequivalent spark-ignition engine.O Unlike spark-ignition engine, there is no knock limit in compression-ignitionengine.The pumping loss in a compression-ignition engine is higher that that of an equivalent spark-ignitionengine.Engine torque of compression-ignition engine is varied by varying the amount ofthe fuel injected.

Answered: Image /qna-images/answer/0a8185a2-d5a6-46f7-a6ca-3979070e871b.jpg

Which statement(s) is/are TRUE about compression-ignition (CI) engine? O The maximum indicated mean effective pressure of a naturally aspirated compression-ignition engine is higher than the corresponding values for an equivalent spark-ignition engine. Unlike spark-ignition engine, there is no knock limit in compression-ignition engine. The pumping loss in a compression-ignition engine is higher that that of an equivalent spark-ignition engine. Engine torque of compression-ignition engine is varied by varying the amount of the fuel injected.

Which statement(s) is/are TRUE about compression-ignition (CI) engine? O The maximum indicated mean effective pressure of a naturally aspirated compression-ignition engine is higher than the corresponding values for an equivalent spark-ignition engine. Unlike spark-ignition engine, there is no knock limit in compression-ignition engine. The pumping loss in a compression-ignition engine is higher that that of an equivalent spark-ignition engine. Engine torque of compression-ignition engine is varied by varying the amount of the fuel injected.

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

See similar textbooks

Similar questions

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.
An 850 KW, 2-stroke, 6-cylinder diesel engine, 370 mm x 450 mm x 257 rpm uses 257 liters per hour of 24 deg API fuel at 21 C. The efficiency of the generator is 93%, while the mechanical-electrical efficiency is 90%. The indicated mean effective pressure is at 8.73 kg/cm?. Determine the following: a. Indicated thermal efficiency b. Plant thermal efficiency c. Brake fuel rate d. Indicated heat rate
Discuss, with the aid of diagrams, the principles of operation of gas turbine plants.
Q2 PART B PLZ SOLVE ASAP
18.13 A rotary compressor is used to supercharge a petrol engine. The static pressure ratio across the rotor is 2.5:1. Static inlet pressure and temperature are 0.6 bar and 5°C, respectively. The air-fuel ratio is 13:1 and the engine consumes 0.04 kg fuel/s. For the air-fuel mixture take y = 1.39 and 1.005 kJ/kg K. The isentropic efficiency of the compressor is 84%. Estimate the power required to drive the compressor. Taking the exit velocity from the compressor as 120 m/s and assuming that the mixture is adiabatically brought to rest in the engine cylinders, estimate the stagnation temperature and pressure of the mixture at the beginning of the compression stroke in the engine cylinder. с
Task 1 A V-8 Spark ignition engine has a 10 cm diameter bore and 10 cm stroke. At the beginning of compression process air is at 95 KPa and 27 Degree Celsius. 750 KJ/Kg of heat was transferred to air during heat addition process. The compression ratio is 8. Consider the variation of specific heats with temperature. A. Describe with the aid of diagrams the operational sequence of four stroke spark ignition engines B. Explain the mechanical efficiency for ideal otto cycle of two and four stroke engines C. What is the difference between four and two stroke spark ignition engines? D. Explain the relationship between thermal efficiency (n) and compression ratio (r). E. Why are high compression ratios not used in spark ignition engines? F. Determine the net-work output per cylinder per cycle (KJ) G. Determine the efficiency of the engine. H. Determine the Mean Effective Pressure (kPa) I. What is the Power Output of the engine running at 2000 rpm. Task 2 A compression ignition engine operates…
B/A six-cylinder, four-stroke oil engine operates on A/F ratio = 20. The diameter and stroke of the cylinder are 100 mm and 140 mm respectively. The volumetric efficiency is 80 percent. The condition of air at the beginning of compression are 1 bar, 27° C. (i) Determine the maximum amount of fuel that can be injected in each cylinder per second. (ii) If the speed of the engine is 1500 r.p.m., injection pressure is 150 bar, air pressure during fuel injection is 40 bar and fuel injection is carried out for 20° crank angle, determine the diameter of the fuel orifice assuming only one orifice is used. Take, pr=860 kg/m³; Cr=0.67.
10 m3 /min of free air is to be compressed to 8 bar gauge in two stages. Assuming an intercooler pressure of 2 bar gauge and polytropic index of 1.3, what is the power consumption of the first stage compressor ? pls choose one a.20.44 KW b.48.8 HP c.22.4 litre/mole d.42.2 bar-m3/min e.25.12 KW
STEP 3 To review the efficiency of ideal heat engines operating on the Otto and Diesel cycles, you are asked to perform the following branches: • Provide general plot(s) for thermal efficiency, O vs compression ratio, r for ideal Otto and diesel engines and show the typical compressions ratios. Compare your plots in terms of the typical compression ratio values. • Using your plot of the thermal efficiency, O vs compression ratio, r for ideal diesel engine, show how will the thermal efficiency of the diesel engine, O would change with the cut-off ratio values. • Explain mathematically how the thermal efficiency, D of Otto cycle is always higher than diesel cycle if-and-only-if both engines are operated at the same compression ratio, D. • Based on your previous answer, indicate why we use diesel engines. • Conclude your results of step 3 in two sentences.
A turbocharged four-stroke direct injection diesel engine has a displacement volume of 0.0259 m³ (25.9 liters). The engine has an output of 950 kW at 2200 rpm. The mean effective pressure (in MPa) is closest to (a) 2 (b) 1 (c) 0.2 (d) 0.1
2. A compression ignition engine draws in air at a pressure of 1.75 bar (abs) and compresses it adiabatically into the clearance volume before the fuel is injected. The stroke volume is 4.04 m³ and the clearance volume is 2.004 m³. Calculate: a. The pressure at the end of compression b. the final temperature, given an initial temperature of 30°C c. the compression ratio of the engine. Bonus: Based on the numbers given above is this a logical problem in an automobiles engine or is this a purely hypothetical question?
5