Which of the following choices is correct.1 regarding the right sequence of :combustion process phases of SI engines Spark ignition - combustion - turbulence - exhaust Spark ignition - early fame development - flame propagation - flame termination Intake - compression - power - exhaust Fuel injection - combustion - flame -propagation - auto-ignition Ignition delay in spark ignition engine can.2 be defined as The period between start of injection .and start of combustion The period between spark onsets and start of combustion The period between spark onsets and actual change in pressure rise The period between spark onsets and start of auto-ignition Severe auto-ignition (knock) can effect the .3 following parts of the engine The piston O Piston rings O Engine head O Head gasket O

Which of the following choices is correct.1 regarding the right sequence of :combustion process phases of SI engines Spark ignition - combustion - turbulence - exhaust Spark ignition - early fame development - flame propagation - flame termination Intake - compression - power - exhaust Fuel injection - combustion - flame -propagation - auto-ignition Ignition delay in spark ignition engine can.2 be defined as The period between start of injection .and start of combustion The period between spark onsets and start of combustion The period between spark onsets and actual change in pressure rise The period between spark onsets and start of auto-ignition Severe auto-ignition (knock) can effect the .3 following parts of the engine The piston O Piston rings O Engine head O Head gasket O

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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Repablic at the Philippines Department of Education REGION VI-WESTERN VISAYAS SCHOOLS DIVISION OF CADIZ CITY CADUHA-AN NATIONAL HIGH SCHOOL BRGY.CADUHA AN CADIZ CITY, NEIGROS OCCIDENTAL rest II. Put your correct answer in the number correspondence 13 12 19 13 20 14 15 21 22 16 23 17 Too Hot B.Worn Ash Deposits Mechanical Damage C.Detonation D.Splash Deposit E.Normal FOil Des H.Pre Ignition K.Gap Bridging I.High Speed Glazing L.Carbon Deposit in Spark Plug insulator Types, How many types are they? В.5 C.3 D.4
Tumble flow has been found to accelerate .9 the combustion process and improve engine performance and it can be defines :as A rotational air motion around an axis perpendicular to the crankcase axis A rotational air motion around an axis parallel to the cylinder axis A rotational air motion around an axis .perpendicular to the cylinder axis .None of the above O The effects of minimising the distance.10 between the spark plug and the end gas :islare Combustion will be as rapid as possible Producing high engine speeds and thus .higher power output The rapid combustion reduces the time n which the chain reactions that lead to knock can occur All of the above
The factors that tend to increase detonation is SI engine led to reduce knocking in C1 engine. Dis this statement with reference to the following influencing factor 1. Compression ratio 2. Inlet temperature 3. Self-ignition temperature of fuel 4. Time lag of ignition temperature of fuel, and 5. Combustion chamber wall temperature
At injection pressure of 150 bar a sprav penetration of 25 cm in 20 milliseconds is obtained Ia njection pressure of 25Qar had been used, what would have been the e taken to penetrof same dis- combustion chambef density. The tance. Assume the same orificear. combustion chamber pressure is 25 bar. Use the relation where S is penetration in cm I is time in millisecond Ap is the pressure difference between injection pressure and combustion chamber pressure
Engine knocking is defined as self-ignition of unburnt mixture other than the spark plugpoint. Explain the engine structural parameters’ effects on engine knocking.
Engineering Related problems: We assess the efficiency of two methods of chemical energy storage.I. First, we store the energy as natural gas (methane, CH4) and utilize it via combustion. We assume thefollowing efficiencies: electrolysis 70%, water-gas shift reaction 75%, natural gas storage andcirculation 80%, Fischer–Tropsch reaction 80%, combustion 75%. Based on these efficiencies, calculatethe efficiency of the total process.II. Secondly, we want to store the energy as hydrogen and utilize it via a fuel cell. We assume thefollowing efficiencies: electrolysis 70%, hydrogen storage and circulation 70%, fuel cell 50%. Calculatethe efficiency of the total process.III. Which of the two methods would you choose to use the hydrogen produced during electrolysis?
A Three stage
2 A six-cylinder, four-stroke, direct-injection oil engine is to deliver 120 kW at 1600 rpm. The fuel to be used has a calorific value of 43 M.J/kg and its percentage composition by mass is carbon 86.0%, hydrogen 13.0%, non combustibles 0%. The absolute volumetric efficiency is assumed to 80%, the indicated thermal efficiency 40% and the mechan- ical efficiency 80%. The air consumption to be required for theoretically correct e 1100 in excess of that (i) Estimate the volumetric comp Jlf of dry exhaust gas (ii) Determine the bore and stroke of t he engine, taking a stroke to bore ratio as 1.5. Assume the volume of 1 kg of air at the given conditions as 0.77 m3. Oxygen in air is 23% by mass and 21% by volume.
18 A single-cylinder, two-stroke cycle model airplane engine with a 7.54-cm displace ment produces 142 kW of brake power at 23,000 RPM using glow plug ignition. The square en- gine (bore stroke) uses 31.7 gm/min of castor oil-methanol-nitrome thane fuel at an air-fuel ratio AF = 4.5. During intake scavenging, 65% of the incoming air-fuel mixture gets trapped in the cylinder, while 35% of it is lost with the exhaust be fore the exhaust port closes. Combustion efficie ncy n = 0.94. Calculate: (a) Brake specific fuel consumption. [gm/kW-hr] (b) Average piston speed. [m/sec] (c) Unburned fuel exhausted to atmosphere. [gm/min] (d) Torque. [N-m]
Typical DI engine heat-release-rate diagram (2) (1) (3) +(4) SOI EOI 160 a b170 180 190 200 210 Crank angle, deg (1) period (2) combustion phase (3) combustion phase (4) A combustion phase Rate of heat relcase
[MO31] THERMODYNAMIC CYCLES It is proposed to build a 1000 MWelectric power plant with steam as the working fluid. The condensers are to be cooled with river water. The maximum steam temperature is 550 C, and the pressure in the condensers will be 10 kPa. Estimate the temperature rise of the river downstream from the power plant. A. AT = 4.9 deg C Power B. AT = 3.9 deg C plant C. AT = 2.9 deg C D. AT = 1.9 deg C Discharge Intake 60 m- 8 m deep River mean speed 10m/minute
A Methanol pool fire shows a fuel mass loss rate of 0.01 kg/s on a load cell Estimate the heat release rate Assume a combustion efficiency of 08 The heat of combustion of Methanol can be obtained from the text book (Table 76) O A 160 KW O B. 20000 KW OC. 200 kW O D. 16000 kW QUESTION 2 Estimate the heat release rate for a keroene pool fires with a mass loss rate of 0 123 kg/s Assume combustion officiency 08 O A. 2000 KW O B. 200 kW OC 4250 kW OD. 34500 KW QUESTION 3 If the diameter of the kerosene pool fire from the above question (Question 2) is2 m, estimate the flame hoight of the pool fire. O A.04 m OB.4 46 m OCB0M O D. 42m