Q78 A four cylinder, four-stroke Petrol engine has a compression ratio of 6 to 1. A test onthis engine gave the following results;Net brake load = 20 kg, effective brake arm = 0.5 m, indicated mep=6*105 N/m², enginespeed 2400 rpm, fuel consumption = 10 kg/h, Calorific value of the fuel = 44000kj/kg,Cylinder bore 86 mm, engine stroke-100mm.ข่าวลCalculate: the mechanical efficiency, ⑥the brake thermal efficiency the relativeefficiency assuming the engine works on the Constant volume cycle and that 8-1.4 forair⑧The brake mean effective pressure.Answers 1 88.4%, 48/5-35 × 105 N/m² 1وو

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Answered: Q78 A four cylinder, four-stroke Petrol…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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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
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.
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.
The following data were taken during a one-hour trial run on a single cylinder, single acting, four-stroke diesel engine of cylinder diameter of 175 mm and stroke 225 mm , the speed being constant at 1000 rpm : Indicated mep: 5.5 barsDiam. of rope brake: 1066 mmLoad on brake: 400 NReading of balance: 27 NFuel consumed: 5.7 kgCalorific value: 44.2 MJ/kg Calculate the indicated power, brake power, specific fuel consumption per indicated kWh and per brake kWh , mechanical efficiency, indicated thermal 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 four-cylinder, four-stroke diesel engine has a bore of 212 mm and a stroke of 292 mm. At full load at 720 rev/min the bmep is 5.93 bar and the specific fuel consumption is 0.226 kg/kW h. The air-fuel ratio as determined by exhaust gas analysis is 25/1.Calculate the brake thermal efficiency and the volumetric efficiency of the engine. Atmosphenc conditions are 1.01 bar and 15°C, and Qnet.p, for the fuel may be taken as 44 200 kJ/kg (36%: 76.1%) 13.6
The following data were taken during a one-hour trial run on a single cylinder, single acting, four-stroke diesel engine of cylinder diameter of 175 mm and stroke 225 mm , the speed being constant at 1000 rpm :Indicated mep: 5.5 barsDiam. of rope brake: 1066 mmLoad on brake: 400 NReading of balance: 27 NFuel consumed: 5.7 kgCalorific value: 44.2 MJ/kgCalculate the indicated power, brake power, specific fuel consumption per indicated kWh and per brake kWh , mechanical efficiency, indicated thermal and brake thermal efficiency.
Q1. During a test on a two stroke diesel engine on full load the following observations were recorded: Speed= 350 rpm Net brake load= 590 N Mean effective pressure= 2.8 bar Fuel consumption=4.3 kg/h Jacket cooling water= 500 kg/h Temperature of jacket water at inlet and outlet= 25°C and 509C respectively Air used per kg of fuel= 33kg Temperature of air in test room= 25°C Temperature of exhaust gases= 400°C Cylinder diameter= 220 mm Stroke length= 280 mm Effective brake diameter= 1 m Calorific value= 43900 KI/kg Proportion of hydrogen in fuel= 15% Mean specific heat of dry exhaust gases= 1.0 KI/kg K Specific heat of steam= 2.09 KJ/kg K Calculate: (1) indicated power (2) brake power (3) draw up heat balance sheet on minute basis.
A 1500cm³, four-stroke, four cylinder CI engine operating at 3000rpm produces 48kW of brake power. Volumetric efficiency is 0.92 and air-fuel ratio AF=21:1 Calculate: (Show your solution) a. Rate of air flow into the engine (kg/sec) b. Break specific fuel consumption (gm/kW-hr) c. Break output per displacement (kW/I)
Engine Type Four cylinder Four stroke Diesel engine, Bore: 0.073m, Stroke: 0.0889m Capacity : 1489cc, Power 36 H.P. at 4000 rpm, Torque: 8.5 kg.m at 2250 rpm and Compression Ratio :17.3:1 Explain how to measure the :- (i) Fuel consumption. Manometer readings for air flow. (iii) RPM, power output etc. (iv) Study of various components of diesel engine.
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.
Q2/ A six-cylinder, gasoline engine operates on the four-stroke cycle. The bore of each cylinder is 80 mm and the stroke is 100 mm. The clearance volume per cylinder is 70 cc. At the speed of 4100 rpm, the fuel consumption is 5.5 gm/sec (or 19.8 kg/hr.) and the torque developed is 160 Nm. Calculate: (1) Brake power, (ii) The brake mean effective pressure, (iii) Brake thermal efficiency if the calorific value of the fuel is 44000 kJ/kg and (iv) The relative efficiency on a brake power basis assuming the engine works on the constant volume cycle = 1.4 for air. thon tected the following observations available :

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