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- QUESTION 35 A syringe (X), forces air, at a high velocity, over a straw (Y). The air in the water chamber (Z) is not moving. Using Bernoulli's Principal, pick the best answer, that describes what will happen to the water in the chamber. Remember that things are always pushed from high pressure areas to low pressure areas. a. The high velocity air at (Y) will have the SAME PRESSURE as the low velocity air over the water at poing (Z), so the water will neither move up or down the straw. b. none of these are true. c. The water in the straw will be forced down into the chamber because the high velocity air at (Y) has a HIGH PRESSURE compared to the air over the water in the chamber at point (Z). d. The high velocity air at point (Y) will have a LOW PRESSURE. As a result, the slow air in the chamber (Z) will have a high pressure, thus forcing water up the straw.Bernoullis equation assumes a. Fluid is compressible b. Flow is unsteady c. No friction in the control volume d. Fluid is a gasIn compressible fluids, which is not assumed to simplify calculation a. Steady flowb. Frictionlessc. Constant densityd. For gases, pressure change must not be less than 10%
- 1. Which statement is true? A. For an ideal fluid flow, the greater the speed, the greater the pressure. B. Atmospheric pressure decreases exponentially with increasing altitude. C. Hydrostatic pressure exerted on a submerged object decreases with the depth of the object. D. The pressure exerted at one point on a confined fluid at rest will decrease as it is transmitted to other parts of the fluid. 2.The difference between absolute pressure and atmospheric pressure is called A. Air pressure B. Barometric pressure C. gauge pressure D. hydrostatic Pressure 3. With the increase in the weight of an object the pressure A. Increases B. Decreases C. remains the same D. none of these. Two identical cylinders are applied in series as shown in Fig.2. The cylinder piston and rod diameters are 80 mm and 40 mm respectively. The valve is working in position 2. Assuming the tank pressure is 1Bar. . In order to lift the mass 3000 kg in velocity of 0.1m/s, how much pressure in MPa are needed from the motor? • How much volume in liter/min are needed from the motor? 24p CA. ZAP Tips: Q=C₂4 P2 A2 P1 A1 A2 A1 Q1 Q2 MIHIXM Q3which fluid mechanics principle explained in terms of the law of consevation of energy? a. archimedes b.bernoulli's c.pascal's d.poiseuille's
- P2 = 387kPa. The static exit pressure p2 equal to %3D %3D A. a. P2 = 510 kPa %3D Shock wave b. p2 = 137 kPa %3D C. p2 = 250 kPa %3D d. p2 = 321 kPaConsider the fluid between two parallel plates, in which we move both plates. Which of the ff. is true? A. The velocity distribution of the fluid is parabolic. B. The higher the viscosity of the fluid, the higher the dissipation of momentum across the fluid. C. the higher the velocities of the two plates, the higher the dissipation of momentum across the fluid. D. The higher the difference in velocities of the two plates, the higher the dissipation of momentum across the fluid. E. None of these.i. A wind turbine has the following data: Downstream wind velocity = 9 m/s Upstream wind velocity =18 m/s Rotor Power output = 1 MW a. Compute the wind rotor efficiency. b. Calculate power in the wind and the length of the rotor blades ii. ComparethedifferenttypesBiogasplants?
- If air flows through an air duct which expands in the flow direction then which of the following statements could be used to describe the flow? Select one: a. The static pressure will remain constant b. The velocity will decrease and the static pressure will rise in the flow direction c. The dynamic pressure will increase in the flow direction d. The static pressure will decrease in the flow direction and the velocity will increase е. The flow velocity and static pressure will both increase(b) Water flows from a pressurized tank through a pipe and rises to the surrounding as shown in Figure Q1 (b). Determine i. the pressure in the tank if the flow is steady, frictionless, and incompressible. A, B, and h are 6 m, 2 m, and 15 m respectively; ii. the flow velocity in the pipe.Vacumm You are designing a vacuum system with a desired equilibrium pressure of 10-7 torr. The turbomolecular pump you are using has a pumping speed of 400 L/s. What is the maximium surface area of the chamber that you can allow, assuming that the outgassing rate per square cm 10-9 torr L/s? Note : total outgassing rate G = ( outgassing rate per area ) * ( area )