2. A test conducted on a four-stroke four-cylinder petrol engine having a bore of 75mm and a stroke of 93mm gave the following data: Engine speed = 3400 rev/min Dynamometer = 70 Nm = 6.7 bar Indicated mean effective pressure Rate of fuel consumption Calorific value of fuel = 8.5 Kg/hr = 42 500 KJ/Kg Clearance volume = 56.8 cm³ Calculate the following for the engine: a. Shaft power, indicated power and mechanical efficiency. b. Indicated and shaft thermal efficiencies. c. Specific fuel consumption.

2. A test conducted on a four-stroke four-cylinder petrol engine having a bore of 75mm and a stroke of 93mm gave the following data: Engine speed = 3400 rev/min Dynamometer = 70 Nm = 6.7 bar Indicated mean effective pressure Rate of fuel consumption Calorific value of fuel = 8.5 Kg/hr = 42 500 KJ/Kg Clearance volume = 56.8 cm³ Calculate the following for the engine: a. Shaft power, indicated power and mechanical efficiency. b. Indicated and shaft thermal efficiencies. c. Specific fuel consumption.

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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Suppose we got the following data during a test of a 2- stroke engine in which gas is usedas a fuel:Diameter of the piston = 149 mmStroke length = 179 mmClearance volume = 0.88 literrpm of the engine = 302Indicated mean effective pressure = 6.0 barGas consumption = 6.0 m3/hCalorific value of the gas (fuel) = 16990 kJ/m3Make a clear sketch the geometry of this engine using the data and determine thefollowing:i. Indicated power developed by the engine in watt.ii. Air Standard Efficiencyiii. Indicated thermal efficiency of the engine.
O: (78 | 3:59 MENG470 - A... I Engine friction 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 kPa 124.38 mfmep kPa 29.52 amep kPa Calculate the net indicated mean effective pressure at the same engine speed.
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1 The following observations are recorded during a test on a four-stroke petro engine, F.C = 25cc of fuel in 10 sec, speed of the engine is 2600 rpm, B.P = 22 kW, Qair 0.00134 m, piston diameter 90 mm, density of the fuel = 0.85gm/cc , compression ratio = 7.5, CV of fuel = 42000KJ/Kg, room temperature = 24 °C %3D = 140mm, stroke length = %3D %3D %3D 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.
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Untitled document File Edit View Insert Format Tools Add-ons Help Last edit was seconds ago 100% Normal text Arial E E E E .... BIUA 1E E -E 12 1 21 514 6. A pump is working on these parameters, 0.37 m3/s with pump efficiency is at 0.89%, the motor efficiency is at 0 87 % and EP is 213 kW. What is the water power in kW
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LR = 5m, LG = 2.5m and LC = 1.1m Q2. The Skylark family of sounding rockets consisted of a number of variants (denoted Skylark 5, Skylark 7, and Skylark 12 respectively). These are illustrated on Page 3. The data given below is based on that for the rocket motors they used (all manufactured and named by what was Royal Ordinance – now part of Roxel): Raven XI Motor Total mass: 1280 kg Length = LR See Case Table (units are m) Diameter = 0.44 m Goldfinch IIA Motor Total mass: 420 kg Length = LG See Case Table (units are m) Diameter = 0.44 m Cuckoo IV Motor Total mass: 242 kg Length = LC See Case Table (units are m) Diameter = 0.44 m The payload mass which is additional to the motor masses is to be taken as 100 kg. (a) For the configurations of the three rockets shown on Page 3 in Fig. Q2: (i) Determine the Pitching/Yawing moment of inertia of each rocket about the base of each rocket. (ii) Explain how you could then find the the Pitching/Yawing moment of inertia of each rocket about its…
Problem Solving: )An object falls from rest in a medium offering a resistonce. The velocity of the object hefore the ohject reaches the ground is given by the differential egua- tion dv/t + V% = 32, t/sec. uhat is the veloaty of the okject one second after it falls ?
As a mechanical engineer, you were asked by your supervisor to monitor the operation of 4-stroke engine; as a result you got the following readings: > Imep = 780 kN/ m2 > Engine speed = 800 rpm > Brake Power 30 kW %3D %3D > nm = 85 % > B/S 0.7 You noticed also, that the inlet valve opens 10° before TDC and closes40° after BDC and it takes 0.0035 second after ignition for the charge to gain maximum pressure. Depending on the above readings, find the following engine parameters: a. The crank angle when the spark occursfor the maximum pressure to be at TDC b. The time period in second of inlet valve opening during one cycle c. The diameter of the engine d. The average piston speed 1 Upload file
C Dynamic Analysis and Aeroelasticity SECTION B Answer TWO questions from this section ENG2012-N The moment of inertia of a helicopter's rotor is 320kg. m². The rotor starts from rest and at t = 0, the pilot begins by advancing the throttle so that the torque exerted on the rotor by the engine (in N.m) is modelled by as a function of time (in seconds) by T = 250t. a) How long does it take the rotor to turn ten revolutions? b) What is the rotor's angular velocity (in RPM) when it has turned ten revolutions?
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