Example 21.2 The torque developed by an engine is given by the following equation: T= 14 250 + 2200 sin 20-1800 cos 20 where Tis the torque in N-m and 0 is the crank angle from the inner dead centre position. The resisting torque of the machine is constant throughout the work cycle. The coefficient of speed fluctuations is 0.01 The engine speed is 750 pm A solid circular steel disk 50 mm thick is used as a flwhekl The mass density of steel is 7800 kg/m. Calculate the radius of the flywheel disk.

14. A single cylinder internal combustion engine working on the four stroke cycle develops 75 kW at 360 r.p.m. The fluctuation of energy can be assumed to be 0.9 times the energy developed per cycle. If the fluctuation of speed is not to exceed 1 per cent and the maximum centrifugal stress in the flywheel is to be 5.5 MPa, estimate the mean diameter and the cross-sectional area of the rim. The material of the rim has a density of 7.2 Mg/m³. [Ans. 1.47 m; 0.088 m²]

5. A 5.6 liter V10 compression-ignition truck engine operates on a four stroke cycle at 3600 rpm producing 162 kW of power in the shaft. The bore and stroke of the engine are related as S = 1.12 B. Calculate: (15 pts) a. Average piston speed (m/s) b. Torque (N-m) c. Brake mean effective pressure

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 horizontal belt conveyor arranged as shown in the figure P1 below operates at a speed of 270fpm and requires 25 Hp at the 40-inch-diameter driving drum. The drum receives power from a countershaftthrough a pair of spur gears. A motor operating at 860 rpm delivers power to the countershaft through aroller chain. The mechanical efficiency of the chain drive is 94 % and of the gears is 96 %. a) Determine theHp of the motor you would recommend. b) Determine the rpm of the driving drum and the countershaft. c)Calculate the number of teeth on the large sprocket required running the conveyor belt at the speedspecified. d) Determine the transmitted torque on the countershaft, in in-lb.

Please solve number 2

You are asked to design a four cylinder four-stroke compression ignition engine for light trucks, which is required to provide a maximum brake torque of (2.0000x10^2) Nm at the rated speed of (4.5000x10^3) rpm. The bore (B)/stroke (L) ratio is required to be (9.00x10^-1). Given that the bmep of the engine is assumed to be (1.000x10^3) KPa, find its bore (B). The answer should be in the unit of meter with 3 significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer

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.

A 3630 New Holland Tractor has a four-cylinder four-stroke cycle engine. It has a cylinder bore of 8.89 cm, a stroke of 12.7 cm, and a compression ratio of 16.5:1. The tractor can develop 32 hp that can be used for field operation at 2000 rpm. Find the piston displacement (cubic centimeter) of the tractor engine, the total displacement volume (liters) of the tractor engine, the stroke to bore ratio and the piston speed (m/min) of the tractor engine.

1 A six-cylinder, gasoline engine operates on the four-stroke cycle. The bore of each cylinder is 80 mm and the stroke 100 mm. The clearance volume per cylinder is 70 cc. At a speed of 4000 rpm the fuel consump- tion is 20 kg/h and the torque developed is 150 Nm. Calculate (i) the brake power (ii) the brake mean effective pressure (iii) brake thermal efficiency if the calorific value of the fuel is 43000 kJ/kg and (iv) the relative efficiency on a brake power basis assuming the engine works on the constant volume cycle. y = 1.4 for air.