A single cylinder, 4 stroke diesel engine gives the following test results: Load on brake drum 205 N, Radiusof brake drum 50 cm, speed 1000 rpm, friction power 1.8 kW, total fuel consumption 1.77 kg/h, calorificvalue of fuel 42000 kJ/kg. Find the brake thermal efficiency, mechanical efficiency and indicated thermalefficiency. If the brake mean effective pressure is 4.5 bar find the swept volume.

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Answered: A single cylinder, 4 stroke diesel…

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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3. The following data were noted for a four-cylinder, four-stroke engine: Diameter = 101 mm, stroke = 114 mm, speed = 1,600 rpm, fuel consumption = 0.204 kg/min, %3D heating value of fuel = 41,800 kJ/kg. Difference in either side of the brake pulley = 378 N, brake circumference = 3.35 m. Assume mechanical efficiency = 83%. Calculate (i) brake thermal efficiency, (ii) indicated thermal efficiency, (iii) mean effective pressure of cylinder, and (iv) fuel consumption per brake power.
A fan is listed having the following performance with standard air:Volume discharge: 120cu.m/sSpeed: 7.0rpsStatic pressure: 310mm water gaugeBP required: 620kWThe system duct will remain the same and the fan will discharge the same volume of 120cu.m/s of air at 93degreeC and a barometric pressure of 735mmHg, when its speed is 7.0rps. Find the brake power input of the fan and the static pressure required.
5. A dynamometer test was done for one hour at steady load on a 6 cylinder dieselengine. It was found to use 42 kg of fuel having Qh = 42,000 J/g. Cylinder is 22.8 cm x27.2 cm, four cycle type. Speed is 550 rpm and dynamometer torque at 27000 kg-cm.Determine the brake thermal efficiency
An engine uses 6.5 kg of fuel per hour of calorific value 30000 kJ/ Kg. If the brake power of the engine is 22kW and mechanical efficiency is 85% , calculate it's indicated thermal efficiency and brake thermal efficiency.
The following particulars refer to a 4-cylinder, 4-stroke petrol engine; Bore= 65 mm, Stroke length = 95 mm, Torque developed = 64 Nm when engine turns 3000 rev/min, Clearance volume = 63 cm3 for each cylinder, Relative efficiency = 0.5 and Calorific value of petrol = 42000 kj/kg. Make calculations for brake mean effective pressure and the fuel consumption in kg/hr.
A gasoline engine working on four-stroke develops a brake power of 20.9 kW. A Morse Test was conducted on this engine and the brake power (kW) obtained when each cylinder was made inoperative by short circuiting the spark plug are 14.9, 14.3, 14.8 and 14.5 respectively. The test was conducted at constant speed. Find the indicated power, mechanical efficiency and bmep when all the cylinders are firing. The bore of the engine is 75 mm and the stroke is 90 mm. The engine is running at 3000 rpm.
A fan is listed having the following performance with standard air:Volume discharge : 120m3/sSpeed : 7.0rpsStatic Pressure : 310mm water gageBP Required : 620kWThe system duct will remain the same and the fan will discharge the same volume of 120m3/s of air at 93oC and a barometric pressure of 735mm of Hg, when its speed is 7.0rps. Find the brake power input of the fan and the static pressure required. Provide solutions and schematic diagram.
Q3) The following reading was taken from the performance test of single cylinder four-stroke engine with 250 mm bore and 400 mm stroke: indicated mep 7.5 bar, engine speed 250 rpm, net load on the brake 1080 N, effective diameter of the brake 1.5 m, fuel used per hour 10 kg, calorific value of the fuel 44300 kK/kg. calculate : (1) Indicated power (2) Brake power (3) Mechanical efficiency (4) Indicated thermal efficiency State any necessary assumptions for your analysis. 1)
Engine Type Four cylinder Four stroke MPFI petrol engine(Maruti Zen), Bore: 0.072 m, Stroke: 0.061m Capacity: 993 cc, Power: 60 HP at 6000 rpm, Torque: 78.5 Nm at 4500 rpm and Compression Ratio :9.4:1. Explain how to calculate :- (1) Mechanical Efficiency (2) Brake Thermal Efficiency (3) Indicated Specific Fuel Consumption
Show from the following data taken for the automobile test performed on a 4 cylinder gasolineengine calculate the Brake Thermal Efficiency:Fuel intake = 9.78 lb/hourBrake output = 36.5 HPSpecific gravity of gasoline at 60°F = 0.738Room temperature = 78.5° FThrottle Setting = 9/16 full throttleHigh heating value (HHV) = 25,960 BTU/lbConversion factor 1HP = 2,545 BTU/hourMUST show all steps. MUST show units in each step.1 horsepower [international] = 0.746 kilowatt1 kilogram = 2.204 lbs1 BTU = 1.055 kilo joulesRound off ALL answers to three decimals. MUST show the units in every step.
3. What will be it brake mean effective pressure (bmep) of a four-stroke engine producing 160 N·m from 2 litres of displacement? Show the computation.
1. A four stroke diesel engine gave the following test results at a speed of 450 RPM. Mean effective pressure - 850 kPa Cylinder bore - 22 cm. Stroke - 26 cm. Specific fuel consumption - 0.32 kg/BHP.hr Calorific value of fuel – 45000 kJ/kg. Mechanical Efficiency = 88% Determine the (a) BHP, (b) IHP, (c) Indicated themal efficiency, and (d) Brake thermal efficiency.

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