A double acting air compressor has a cylinder dimensions of 50 cm x 60 cm, 650 rpm will have a volume displacement of:
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A double acting air compressor has a cylinder dimensions of 50 cm x 60 cm, 650 rpm will have a volume displacement of:
A. 4.12 m3/s
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- A forced draft fan is used to provide the combustion air requirements for a boiler that burns coal at the rate of 10 metric tons per hour. The air requirements are 100,000m3/hr , air is being provided under 150 mm water gage by a fan which has a mechanical efficiency of 60%. Find the size of the driving motor in kW1. A centrifugal pump has external and internal diameters of 300 mm and 150 mm respectively. The vane angles of inlct and outlet are 25 and 30° and the pump runs at 1450 r.p.m, If the velocity of flow through the pump is constant, find the work done per kN of water. (Ans. 20-2 kJ)A petrolengine has mechanical efficiency 0.8 and lower calorific value of ispoots 44.2 MJ/kg. The engine bore 0.06 m and stroke of 0.08 m. The engine speed of 2000 rom. The consumption of fuel about 8 liter/h and the brake welght is 200N. Take the density of fuel as 750 kg Im3 and torque arm of A00 mm Find the specific fuel consumption.
- A petrol engine has mechanical efficiency 0.8 and lower calorific value of 44.2 MJ / kg. The engine bore 0.06 m and stroke of 0.08 m. The engine speed of 2000 rpm. The consumption of fuel about 8 liter / h and the brake weight is 200 N. Take the density of fuel as 750 kg / m3 and torque arm of 400 mm.Find the specific fuel consumption. *Ex: A centrifugal pump delivers (0.07 m³/s) of water at (1500 rpm) and the velocity of flow through the impeller at exit is (3m/s). The impeller diameter at inlet and out let are (0.18&0.027) respectively, and blades are curved back with an angle of 25° to the tangent at exit (the blade angle is 155° with the direction of motion). The diameter of the section and delivery pipes are (0.15 & 0.1m) respectively. The absolute pressure head at section is (6.5 m) and that at delivery is (29 m). the power taken by the pump is (35 hp). Calculate the van angle at the inlet, the overall efficiency and the monomeric efficiency and the losses across the pump.Gas Compressors 14.5 Find the cylinder dimension of a single-cylin der, double acting compressor handling 28.32 Its/revolution of air from 99.975 Kpaa to 723.954 kPaa. Compression and reexpansion are in accordance with p35 = C. Use the conventional volumetric efficiency; c = 5% and L/D =1. Ans. 26.77 x 26.77cm
- An air compressor is to compress 510m /hr from 100kpa to 10bar, for an ideal compres n=1.3, what will be the percent saving in power due to two staging?A single-stage centrifugal pump having a suction pipe 254 mm in diameter anda discharge pipe diameter of 5 inches is being tested and found out to discharge 48 lps ofwater. A pressure gage connected to the inlet pipe reads 118 mm Hg vacuum and adischarge gage reads 150 kPa at a distance 100 cm above the point where the inletpressure was measured. If the kW rating of the driving motor is 12 kW, calculate: a) the pump efficiency. b) if this pump runs at 1800 rpm, what will be the new discharge rate,head, and power developed if the pump speed was increased to 3600 rpm? Assumeconstant efficiency. c) Determine the pump type.Q2: Use dinensional analysis to derive as epresion for the power develaped by an engine in terms of the torpue T and roarive sped u.
- A pump operates at 600 W, the mass flow rate of the liquid is 1 kg/s, at the inlet the fluid is stagnate, and velocity at exit is 12 m/s, the mechanical efficiency of the pump is: Select one: a. 0.90 b. 0.91 c. 0.92 d. 0.89A 650 bhp Diesel Engine with 6 cylinders has a brake thermal efficiency of 36 % and a jacketwater loss of 27%. It uses a closed cooling system with a cooling tower 10 meters high. Thetemperature rise after passing the water jacket is 12 °C and the cooling tower range is 5 °C. Make asketch showing the vital parts of the cooling tower system and calculate:a) capacity of the jacket water pump in GPMb) exhaust loss if the friction, radiation and other losses total 8%.c) cooling water flow rate in the cooling tower in liter/hrd) standard size electric motor to drive the raw water pump if the total dynamic head is 35 meters and the pump efficiency is 84%A boiler feed pump operates at 40oC suction. If pump efficiency is 85% and needs 20 kW power of motor needed to drive the pump, find the maximum pressure of the boiler could attain for a mass of 2 kg/s.