The air flow through a four-cylinder, four-stroke gasoline engine was measured by means of a7.5-cm diameter accurate flow-measuring device with its discharge coefficient of 0.66. Duringa Power Plants laboratory trial on this engine the following data were noted down as follows:Bore (d)Stroke (Ls)Shaft speed (N.)Mass flow rate of fuel used (m,)Brake power (W,)= 110= 12= 180000 rev/h166.67 g/minmmст= 40kWMJ/kgkJ/kgHigher calorific value (HCV)Heat carried away by water vapours in the exhaust (qsteam)Pressure drop across the measuring device (Ahw), by a water manometerAtmospheric pressure (P.)Atmospheric temperature (ta)442000cmH2Obar°C1.01= 23Determine:(a) the brake thermal efficiency (7, th),(b) the brake mean effective pressure (P m), and(c) the volumetric efficiency (nvol.e air cond) based on free air conditions.For air: Ra = 0.287 kJ/(kg-K) and the mass density if water, P =987kg/m³ and the local accel-eration due to gravity, g = 9.79 m/s².4.

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The air flow through a four-cylinder, four-stroke gasoline engine was measured by means of a 7.5-cm diameter accurate flow-measuring device with its discharge coefficient of 0.66. During a Power Plants laboratory trial on this engine the following data were noted down as follows:

The air flow through a four-cylinder, four-stroke gasoline engine was measured by means of a 7.5-cm diameter accurate flow-measuring device with its discharge coefficient of 0.66. During a Power Plants laboratory trial on this engine the following data were noted down as follows:

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 air flow through a four-cylinder, four-stroke gasoline engine was measured by means of a 7.5-cm diameter accurate flow-measuring device with its discharge coefficient of 0.66. During a Power Plants laboratory trial on this engine the following data were noted down as follows: Bore (d) Stroke (L) Shaft speed (N.) Mass flow rate of fuel used (rim, ) = 110 = 12 = 180000 rev/h = 166.67 g/min mm cm Brake power (W, ) = 40 kW = 44 = 2000 Higher calorific value (HCV) Heat carried away by water vapours in the exhaust (qsteam) Pressure drop across the measuring device (Ahw), by a water manometer = 4 Atmospheric pressure (P.) Atmospheric temperature (ta) MJ/kg kJ/kg cmH2O = 1.01 = 23 bar °C Determine: (a) the brake thermal efficiency (7,th). (b) the brake mean effective pressure (Pom) , and (c) the volumetric efficiency (7ol.fme air cona) based on free air conditions. For air: R, = 0.287 kJ/(kg-K) and the mass density if water, P =987kg/m³ and the local accel- eration due to gravity, g = 9.79…
Using the performance curves below, For a prototype that is 10 times larger than the model and operates at a speed of 600 rpm, what head, discharge, and brake horsepower are to be expected at maximum efficiency? What is the efficiency of the prototype? 250 100 CH Efciency 200 80 1.00 Power input, kW 4 Eficiency,.n 150 0.75 CH 3 Head (A), m 100 0.50 2. 50 20 0.25 N= 2133.5 rpm H35.6 rps D 37.1 cm 0.05 0.10 0.15 0.20 0.25 004 008 0.12 0.16 Discharge, m'/s Head, m power, kW Efficiency, percent Ooga pue
B) The air flow to a four cylinder four-stroke engine is 2.15 m³/min. During a test on the engine the following data were recorded: Bore 10.5cm; stroke 12.5cm; engine speed 1200 rpm, torque 150 N.m, fuel consumption 5.5 kg/hr, calorific value of fuel, 43124 kJ/kg, ambient temperature 1-The brake thermal efficiency. and pressure are 20°C and 1.03 barş. Calculate: 2-The brakes mean effective pressure. 3-The volumetric efficiency.
(5) A pickup truck has a five liter, V6, SI engine operating at 2400 r.p.m. the compression ratio rc = 10.2:1, the volumetric efficiency y = 0.91, and the bore and stroke related as stroke S = 0.92 B. calculate :- (a) stroke length. (cm) (b) Average piston speed. m sec (c) Clearance volume of one cylinder. kg (d) Air flow rate into engine. sec (cm³)
During a test on a five-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 260 mm and 305 mm respectively, running at 435 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 0.825 m) 206.1 kg Indicated mean effective pressure 400 kPa Fuel consumption (with Qnet y = 39.8 MJ/kg, density = 0.944 kg/l) 6 ml/s Take acceleration due to gravity as 9.81 m per square seconds Calculate the brake power. add unit but not in kilos
During a test on a five-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 260 mm and 305 mm respectively, running at 500 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 825 mm) 205 kg Indicated mean effective pressure 400 kPa Fuel consumption (with Qnet,v = 39.8 MJ/kg, density = 0.944 kg/l) 6.1 ml/s Calculate the energy supplied by the fuel (kW),
During a test on a 4-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 317 mm and 307 mm respectively, running at 481 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 0.825 m) 205 kg Indicated mean effective pressure 403 kPa Fuel consumption (with Qnet,v = 39.8 MJ/kg, density = 0.944 kg/l) 6 ml/s Take acceleration due to gravity as 9.81 m per square seconds Calculate the brake thermal efficiency in decimal form.
1(C) A centrifugal pump has an impeller of diameter (D) of 300mm. When pumping 20°C water at a fixed rotational speed of 1500 RPM, the measured flow rate Q and pressure rise Pare given by the manufacturer as follows: Flow Rate (L/s) 13 19 25 32 38 44 Pressure Rise (Bar) 2.5 2.4 2.35 2.2 2.0 1.6 It is desired to use the same pump, running at 945 RPM, to pump 20°C water at 22L/s. According to your dimensionless correlation, what pressure rise p is expected?
In the diesel engine experiment, if: engine speed= 1302 Torque (N.m) = 9.9 Power(W)= 1344 Air mass flow rate (Kg/sec) = 0.002178 fuel mass flow rate (Kg/sec) = 0.000140 Tamb (C)= 20.1 Texh (C)= 292 Pamb (mbar)= 929 Air box Pressure (Pa)= -82 The Volumetric efficiency will be: Select one: a. 84.89% O b. 78.33% O c. 65.27% O d. 71.86%
For the model pump below (impeller size: 37.1 cm; shaft speed: 2133.5 rpm), if it is operated to achieve a pump efficiency of 60% at a discharge within the range between 0 and 0.25 m³/s, using a shaft speed of 1800 rpm instead, what will most approximately be the power coefficient? Assume water density 1000 kg/m³. 250 Head, m; power, kW 200 150 100 000 0 50 O 0.69 O 0.73 O 0.88 O 0.52 Efficiency 0.05 Head (AH), m N=2133.5 rpm = 35.6 rps D = 37.1 cm 0.15 Discharge, m³/s 0.10 Power input, kW 0.20 0.25 100 80 60 40 20 0
Laboratory tests on a centrifugal pump, which is directly coupled to a motor running at constant speed of 1450 rpm give the following data: Q, m³/s H, m P, KW 0.0 105 100 0.05 104 115 0.10 102 135 0.15 100 171 0.20 95 202 0.25 85 228 0.30 67 249 Plot the operating characteristic curve and hence determine the specific speed and the discharge at the Best Efficiency Point (BEP).
During a test on a 3-cylinder four-stroke IC diesel engine with a cylinder bore and stroke length of 261 mm and 315 mm respectively, running at 482 r/min, the following results were obtained: Mass on Dynamometer mass hanger (arm length = 0.83 m) 224.8 kg Indicated mean effective pressure 444 kPa Fuel consumption (with Qnet v = 39.8 MJ/kg, density = 0.944 kg/l) 6 ml/s Take acceleration due to gravity as 9.81 m per square seconds Calculate the indicator power to 2 decimal places, add unit to answer but not in kilos.