Why does the rod of a double-acting cylinder retract at a greater velocity than it extends for the same input flow rate?
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Why does the rod of a double-acting cylinder retract at a greater velocity than it extends for the same input flow rate?
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- A double acting cylinder has a system pressure of 0.1750 kN/cm to produce an extraction force of 0.065 MN and Retraction force of 49 KN. The available extension velocity is 16500 m/min. (a) Find the diameter piston in mm (b) Find the diameter of ram in mm for the same system pressure. (C) Flow rate in Ipm (d) Retraction velocity E A- BI EDerive an expression for the maximum velocity for circular pipe and fixed parallel plates.What is the engine bore (in mm) required for good volumetric efficiency for an engine with two inlet and two exhaust valves, stroke of 90 mm, inlet air temperature of 332 K, exhaust temperature of 900 K, engine speed of 8200 rpm and exhaust valve diameter 22 mm (each). Assume specific heat ratio =1.3, R = 287 J/kg.K, and an average inlet flow coefficient 0.4 and an average exhaust flow coefficient 0.5. Select one: O a. 96.57 O b. 70.23 O c. 105.2 O d. 91.05 O e. 82.71
- A double acting pneumatic cylinder has a diameter of 160 mm. The rod is 50 mm diameter and the stroke is 160 mm. It must produce a pushing force of 10 kN. The flow rate available in both dirertions is 14 mm³ /minute. Calculate: (c) (i) The needed system pressure (ii) The force of retraction (iii) The velocity on the extension (iv) The velocity of retraction (v) The power used on the outstroke (extension motion)(2) a fou-cylinder, 2.4 liter engine operates on a four-stroke cycle at 3200 r.p.m. the compression ratio is 9.4:1, the connecting rod length r = 18 cm, and the bore and stroke are related as S = 1.06 B. calculate :- 3 (a) clearance volume of one cylinder in cm³,L, and in ³. (b) Bore and stroke in cm and in. (c) Average piston speed in m/seca 1 ft/secQ1: A hot -drawing machine is shown in the figure. The heat is transferred from the drawn wire with heat transfer.coefficient h to an ambient at temperature Te. At location L, we need to know the temperature TL for a chemical treatment. The inlet temperature of the wire To is specified. Derive an expression for the angular velocity of the rotating disc. T. TL КРА
- ) where AP is the static The Hagen-Poiseuille equation for the laminar flow through a circular pipe is: AP pressure drop measured over some length of pipe, L. Use the Hagen-Poiseuille equation and the Darcy-Weisbach equation to derive an expression for the fanning friction factor, f, for laminar flow through a circular pipe where Re is the Reynolds number. Choose one answer from the list below: of= of O None of the above 32 Re 16 Re O f = 64 Re = o f = 32μLc 3 d² 8 Re O f = 16 ReIn a duct of uniform cross section only static pressure remain constant the total pressure decrease along the length only the dynamic pressure remain constant O static pressure increase along the length velocity reduction method is used for very simple layot duct O very large layot duct O simple and large duct O all of the aboveFor an inlet valve, the mass flow rate through the valve is 0.44 kg/s. The flow coefficient is 0.62 and the cylinder pressure is 105 kPa. Assume intake system pressure and temperature are 180 kPa and 527 K, the specific heat ratio is 1.3 and R =287 J / kg.K. The area of the valve is (SI unit): Select one: a. 2.30*10-3 O b. 3.45*10-2 O c. 1.43*10-3 O d. 1.75*10-3 O e. 0.85*10-2
- A single acting, twin cylinder, Ammonia compressor with bore equal to stroke is driven by an engine at 250 rpm. The machine is installed in a chilling plant to produce 700 kW of refrigeration at -18°C evaporating temperature. At this temperature the cooling effect per kg mass is 1160 kJ. The specific volume of vapor entering the compressor is 0.592 m³ per kilogram. Assume 85% volumetric efficiency, determine the bore in mm. A. 400 mm С. 450 mm В. 300 mm D. 500 mmQ2l Calculate size of each part for the air conditioning ducts system shown in Figure(1) by using equilibrium pressure drop method. The velocity of air in main duct 7 m/s. Tabulate the results (velocity value, rate of pressure drop, circular diameter, and air flow rate) for each part, then convert circular ducts to equivalent rectangle ducts at height 300 mm for all system. 0.5 m³/s E 5m A D 0.5m³/s 3m B Figure (1) 3m 3m 5m C 1 m³/sAn automobile radiator is a compact heat exchanger powered by water-air. In both fluids does not interfere. There are 60 pipes with an inner diameter of 6.35 mm in the radiator. Of each pipe its length is 800 mm. Hot water enters the pipe at 85 ° and leaves at 55 ° C. Water flow 0.8 kg / s given as. The air enters the winged surfaces diagonally at 10 ° C and heats up to 35 ° C. emerges from the other side. Find the total heat transfer coefficient of the air side of the pipe.