for a Fuel rate, 24 lb per hr of 24°API fuel Prony brake, 42-in. arm, 280-lb gross, 25-1b tare Speed, 420 rpm Engine dimensions, 9 by 14 in.
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- 5.) A double-acting 12-cylinder, 4-stroke cycle engine with a cylinder diameter of 240 mm operates at 2,400 rpm. The prony brake arm at 1.24 meters registered an equivalent braking load of 0.24 metric ton. Calculate the brake mean effective pressure in psi. the piston travels 1.24 times its diameterA four stroke, 12 cylinder diesel engine has a bore and stroke of 280mm and 2020 mm, respectively, per cylinder. The brake mean effective pressure of each cylinder is 1.2 MPa and the engine rotates at 145r.p.m. 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) which formula should be used to determine the brake power of the engine? 2) calculate the brake power of the engine in MW? 3) which formula should be used to determine the indicated power of the engine?In the system shown in Fig. P-13-3.14, body A is dropping at 40 fps when a brake force P=80lb is applied. Determine the time for A to come to rest. Neglect the thickness of the brake block
- Calculate the braking moment of the measured brake, using first approachif you know that P0 [N]=50N, μ=0.4 and length of loaded spring – L1=190mm.Discuss the turning moment diagram for a two-stroke cycle internal combustion engine in one cylinder and multi-cylinder (inline 5-cylinder).vertical single cylinder four stroke diesel engine has a bore = 87.5 mm and stroke = 110 mm respectively. It is water cooled and develops a torque of 16.25 N-m when running at 1465 rpm , with fuel consumption time for 10 cc as 28.0 sec. find brake specific fuel consumption? , Assume the specific gravity of fuel to be 0.82.
- 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 pf 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) which formula should be used to determine the brake power of the engine? 2) calculate the brake power of the engine (MW) ? 3) which formula should be used to determine the indicated power of the engine? 4) calculate the indicated power of the engine (MW) ? 5) which formula should be used to determine the the energy supplied by the fuel? 6) calculate the energy supplied by the fuel (MW) ? 7) which formula should be used to determine the fuel consumption? 8) calculate the specific fuel consumption (kg/kWh) ? 9) which formula should be used to determine the specific fuel consumption? 10) calculate the fuel consumption (kg/h)?From a test on diesel engine that produces power in two full revolutions of the crank shaft, following data is available: Engine speed 25 rps; Net brake torque 69 N-m; Mean effective pressure 1.2 N/mm2 ; Stroke 140 mm and bore 82.5% of the stroke; Rate of fuel consumption 0.825 g/s; Calorific value of fuel is 42 MJ/kg. Calculate the indicated thermal efficiency and brake thermal efficiency of the engine.A 4 stroke, 3 liter engine runs at 2000 RPM, and delivers 100 kW of brake power and consumes 350 grams of fuel per hour per brake kW. The rate of fuel consumption at no load is 5.6 kg/hour. Calculate:1.The mechanical efficiency when the brake power is 25 kW? 2.The brake mean effective pressure for a mechanical efficiency of 0.7? 3.Frictional mean effective Pressure? 4.Indicated Specific Fuel Consumption when the brake power is 75 kW
- 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 efficiency1. A three cylinder single acting engine has its cranks set equally at 120° and it runs at 800 r.p.m. Thetorque-crank angle diagram for each cycle is a triangle for the power stroke with a maximum torque of 100N-m at 60° from dead centre of corresponding crank. The torque on the return stroke is sensibly zero.Determine: 1. power developed. 2. Coefficient of fluctuation of speed, if the mass of the flywheel is 15 kgand has a radius of gyration of 70 mm, 3. Coefficient of fluctuation of energy, and 4. Maximum angularacceleration of the flywheel.The turning-moment diagram for one cycle of a multi-cylinder engine shows fluctuations in energy above and below the mean-torque line as follows: –62·5 J, +105·7 J, –27·3 J, +63·3 J, –59·1 J, +25·2 J, –99·3 J and +54 J. Sketch the diagram and use it to find the mass of the flywheel, radius of gyration 220 mm, needed to keep the engine speed within the range 898 to 902 rev/min