A four-stroke, four cylinder racing engine of capacity 2.495 litres has a bore of 94 mm and a compression ratio of 12/1. When tested against a dynamometer with a torque arm of 0.461 m a maximum load of 622 N was obtained at 5000 rev/min, and at a peak speed of 6750 rev/min the load was 547 N. The minimum fuel consumption was 17.2 ml/s at a speed of 5000 rev/min, the specific gravity of the fuel being 0.735, and calorific value of 44200 kJ/kg. Calculate: 3.1 The maximum brake mean effective pressure The maximum brake power 3.2 3.3 The minimum specific fuel consumption 3.4 The maximum thermal efficiency at maximum torque 3.5 The air standard efficiency

A four-stroke, four cylinder racing engine of capacity 2.495 litres has a bore of 94 mm and a compression ratio of 12/1. When tested against a dynamometer with a torque arm of 0.461 m a maximum load of 622 N was obtained at 5000 rev/min, and at a peak speed of 6750 rev/min the load was 547 N. The minimum fuel consumption was 17.2 ml/s at a speed of 5000 rev/min, the specific gravity of the fuel being 0.735, and calorific value of 44200 kJ/kg. Calculate: 3.1 The maximum brake mean effective pressure The maximum brake power 3.2 3.3 The minimum specific fuel consumption 3.4 The maximum thermal efficiency at maximum torque 3.5 The air standard efficiency

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

A four-stroke SI engine 0.08 m bore (d), 0.10 m stroke (L), is tested at full throttle at constant speed. The fuel supply is fixed at 0.0011333 kg/s and the spark plugs of the four cylinders are successively short circuited without change of speed, brake torque being correspondingly adjusted. The brake power (bp) measurements are the following:With all cylinders firing = 12.5 kWWith cylinder No. 1 cut off = 9 kWWith cylinder No. 2 cut off = 9.15 kWWith cylinder No. 3 cut off = 9.2 kWWith cylinder No. 2 cut off = 9.1 kWThe lower calorific (or heating value, LCVf) of the fuel is 44100 kJ/kg. The clearancevolume (Vcl) of one cylinder 70.0 x 103 mm3. Determine:(a) Indicated power (ip) of the engine under these conditions.(b) The indicated thermal efficiency (c) The relative efficiency of this engine. (d) Draw schametic diagram
For the Internal Combustion Engine test that you conducted, sketch the P-V diagram showing thesuction, compression, power and exhaust strokes. Label the events on the diagram. Indicate where themaximum pressure occurs
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).
(b) An air motor operates with a cylinder bore of 65 mm and maximum stroke of 115 mm. The supply pressure is 6.5 bar at 28°C with the exhaust pressure is maintained at atmospheric pressure. The air motor clearance volume is 5% of the swept volume and the cut-off ratio is 0.5. The induced air is compressed by the returning piston after it has travelled 95% through its stroke. Given that pV=constant, calculate; (i) the resulting temperature (K) at the end of expansion; (ii) the indicated power (kW) of the motor at 400 rpm; and (iii) the mass flowrate (kg/min) of air supplied by the air motor.
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 swept volume in m3/min, 2. the volume of mixture induced in m3/min 3. the gas flow to engine m3/min4. the energy supplied by gas5. the brake thermal efficiency
A four-stroke SI engine 0.08 m bore (d), 0.10 m stroke (L), is tested at full throttle at constant speed. The fuel supply (m; ) is fixed at 0.0011333 kg/s and the spark plugs of the four cylinders are successively short circuited without change of speed, brake torque (4) being correspondingly adjusted. The brake power (bp) measurements are the following: With all cylinders firing With cylinder No. 1 cut off With cylinder No. 2 cut off With cylinder No. 3 cut off With cylinder No. 2 cut off = 9.1 kW 12.5 kW 9 kW 9.15 kW 9.2 kW The lower calorific (or heating value, LCV) of the fuel is 44100 kJ/kg. The clearance volume (Va) of one cylinder 70.0x10³ mm³. Determine: (a) Indicated power (ip) of the engine under these conditions. (b) The indicated thermal efficiency (Nind, th). (c) The relative efficiency (7el) of this engine.
A six-cylinder two-stroke automotive engine has been designed to provide a maximum brake torque of (3.30x10^2) Nm at rated engine speed of (5.000x10^3) rpm. The engine specifications are listed below: Bore and stroke (mm): (8.4000x10^1) x (9.2000x10^1) Compression ratio: 11.0: 1 Find its brake mean effective pressure (bmep). The answer should be in kPa with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer
Calculate the output power of a four cylinder, two stroke engine run at 2500 rpm. The specific fuel consumption is 0.005 Kg /KW minutes. The diameter of fuel orifice Is 0.8 mm and the specific gravity is 0.875 the fuel is injected at a pressure of 14000 KPa and the pressure in the combustion chamber is 3500 Kpa over a crank travel is 20. Cofficient of velocity is 0.87. *
A four cylinder diesel engine works on lower stroke has cylinder bore of 90 mm and the stroke of 150mm. The crank speed of 370 rpm fuel consumed by the engine 15 kg/hr and its calorific value 39000 kJ/kg the indicated mean effective pressure is 5 bar of compression ratio of an engine is 14 and cut off ratio is 2.3. Calculate relative efficiency of an engine if y=1.4
I need the answer as soon as possible
Discuss the turning moment diagram for a four-stroke cycle internal combustion engine in one cylinder and multi-cylinder (inline G-cylinder).
Answer this