1 A four-stroke gas engine has a bore of 20 cm and stroke of 30 cm andruns at 300 rpm firing every cycle. If air-fuel ratio is 4:1 by volume andvolumetric efficiency on NTP basis is 80%, determine the volume of gasused per minute. If the calorific value of the gas is 8 MJ/m3 at NTPand the brake thermal efficiency is 25% determine the brake power ofthe engine.

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Answered: 1 A four-stroke gas engine has a bore…

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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1- A four-cylinder, two stroke cycle diesel engine with (10.9 cm) bore and (12.6 cm) stroke produces (88 kW) of brake power at (2000 RPM). Compression ratio is (18:1). Determine: (a) Engine displacement. Ans.: (4700.6 cm³). (b) Brake mean effective pressure. Ans.: (561.7 kPa).
4. The following data were obtained during a test on a diesel engine operating at 2800 rev/min: =132 Nm Dynamometer torque measurement Fuel consumption Intake air flow rate =12 kg/h =168 kg/h Calorific value of fuel =44 400 kJ/kg Engine cooling water flow rate =15.4 kg/min =48°C Engine cooling water temperature rise =8.7 kg/min Exhaust calorimeter cooling water flow rate Exhaust calorimeter cooling water temperature rise Exhaust gas temperature at exit from calorimeter =64°C = 85°C Specific heat of exhaust gas =1.1 kJ/kgK laboratory air temperature = 25°C Draw up percentage-based energy balance for the engine using the laboratory temperature as the datum.
The Stroke of a gas engine which works on the constant volume cycle is 300 mm. The pressure at the beginning of the compression is 1.74 bar and at the end of compression is 14.52 bar. Assuming compression follows the law PV^1.36 = C, Calculate the clearance between the piston and cylinder cover at the end of compression in mm of length.
A power generator with two-cylinder, four-stroke gas engine has a bore of480 mm and a stroke of 585 mm. At 300 rev/min the torque developed is10 kNm. The generator is supplied with a mixture of gas and air in theproportion of 1 to 8 by volume. The estimated volumetric efficiency is 80% and the net calorific values of the fuel is 48.6 MJ/m3 Calculate:1 The brake power in kW2 the mean piston speed in m/s3 the break mean effective pressure in bar
If the displacement volume is 140 c, we obtained a speed of 1200 rpm and torque of 4.2Nm after conducting the SI engine experiment. Calculate the Brake power in KWatt. Select one: O a. 528 O b. 0.528 O c. 628 O d. 0.628
The relative efficiency of a engine will be equal to if air standard efficiency & brake thermal efficiency of engine are 53.4% & 24.4% respectively. (a) 40.7% (B) 13.1% (C) 45.7% (d) 53.4%
a.) A four-stroke reciprocating engine have a 2000 indicated horsepower. What would be the indicated mean effective pressure (lb/in^2) if the length of the stroke is 0.5 foot, and the area of the piston head is 28.27in^2. The engine runs at 2700rpm with 12 cylinders. b.) What would be the Friction Horsepower of the Engine in (a.) if its BMEP is 150 lb/in^2.
A four-stroke, 12-cylinder diesel engine has a bore and stroke of 820 mm and 2020 mm, respectively, per cylinder. The brake mean effective pressure of each cylinder is 1.2 MPa and the engine rotates at 145 rpm. The brake thermal efficiency of the engine is 32%, the mechanical efficiency is 72% and the net calorific value of the diesel is 40.75 MJ/kg. 1. calculate the specific fuel consumption (kg/kWh) ? Answer to 3 decimal places. 2. calculate thefuel consumption (kg/h) ? Answer to 0 decimal place.
2) Determine the Ranking Cycle Efficiency in %. 3) Determine the Brake Thermal Efficiency of the cycle in % 4) Determine the Combined thermal and electrical efficiency in %.
A four-stroke automotive engine has been designed to provide a maximum brake torque of (2.00x10^2) Nm at rated engine speed of (4.8000x10^3) rpm. The engine specifications are listed below: Bore and stroke (mm): (7.900x10^1) x (8.300x10^1) Compression ratio: 12.0 : 1 Estimate the maximum brake power the engine will deliver. The answer should be in kW with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10
Determine the ideal efficiency of a diesel engine having a cylinder with bore 200mm and stroke length is 350mm. The clearance volume is 1200cc and fuel cut-off occurs at 5% of the stroke volume. Assume y=1.4.
5. Calculate the brake thermal efficiency of a supercharged 4-cylinder, four stroke cycle Diesel engine with a bore and stroke of 3.94" x 5.91". The compression ratio is 14. Using a brake torque analysis, the dynamometer reads a scale of 143.3 pounds with 13.8 arm at 440 rpm. For a period of 14 minutes of test, 1.433 pounds of fuel with 40,702 KJ/kg heating value are completely burned with air with fuel-air ratio of 0.07 a.) 31.8% b.) 34.1% c.) 32.7% d.) 33.5%

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