MET330 202001E Applied Fluid Mechanics - Week 3 Review AssignmentP1. Questions, Concepts, and Definitions Minor Losses Question 1. Which of the following statements is true about the...

File attached



MET330 202001E Applied Fluid Mechanics - Week 3 Review Assignment P1. Questions, Concepts, and Definitions Minor Losses Question 1. Which of the following statements is true about the resistance coefficient K? A. K is used in the evaluation of energy losses for valves and fittings B. K is dimensionless C. K is the constant of proportionality between energy loss and velocity head D. K depends on the geometry of the device that causes the loss E. All of the above Answer: ____________ Question 2. Which of the following statements is true about pipe sudden enlargements encountered in fluid flow? A. The amount of energy loss is dependent on the ratio of the size of the two pipes. B. The amount of energy loss is dependent on the magnitude of the flow velocity in the smaller pipe. C. The resistance coefficient K is greater than that of exit loss. D. A and B E. A and C Answer: ____________ Question 3. Which of the following statements is true about exit loss? A. An exit loss occurs when a fluid flows from a pipe into a large reservoir or tank. B. The fluid velocity decreases to nearly zero after the exit. C. The resistance coefficient is always constant and equal to 1. D. A, B and C E. None of the above Answer: ____________ Question 4. Which of the following statements is NOT true about gradual enlargement? A. The energy loss is less than that produced by a square-edge sudden enlargement. B. The resistance factor K is dependent on the diameter ratio. C. The resistance factor K is dependent on the cone angle θ. D. The turbulence is reduced as the cone angle increases. E. None of the above Answer: ____________ Question 5. Which of the following statements is NOT true about a diffuser? A. A diffuser is another term for an enlargement. B. A diffuser converts kinetic energy into pressure energy. C. The fluid accelerates as it travels through the diffuser. D. The ratio of the pressure recovery from the real diffuser to that of the ideal diffuser is an indication of its effectiveness. E. None of the above Answer: ____________ Question 6. Which of the following statements is true about sudden enlargements and sudden contractions? A. The energy loss is always proportional to the velocity head of the smaller pipe. B. The resistance factor K is dependent on the ratio of the size of the two pipes. C. The resistance factor K is dependent on the velocity of the flow in the small pipe. D. The energy loss is caused by the fluid turbulence. E. All of the above Answer: ____________ Question 7. Which of the following is true about the vena contracta? A. The vena contracta is the section where this minimum flow area occurs in a sudden contraction. B. Beyond the vena contracta the flow stream decelerates. C. Beyond the vena contracta the flow stream must expand again to fill the pipe. D. A, B, and C E. None of the above Answer: ____________ Question 8. Decreasing the cone angle decreases energy loss for a gradual contraction. However, for values of cone angles below 15, energy loss increases. Which of the following is thought to be the cause of this phenomenon? A. The wall friction loss. B. The increase of the local turbulence. C. The rounding of the end of the conical transition. D. A and B. E. B and C. Answer: ____________ Question 9. Which of the following is NOT true about entrance loss? A. Entrance loss occurs when a fluid flows from a reservoir or tank into a pipe. B. The resistance coefficient is dependent on the geometry of the entrance. C. The major cause of the energy loss is the turbulence associated with the formation of the vena contracta. D. A well-rounded entrance has the worse resistance coefficient. E. None of the above Answer: ____________ Question 10. Consider a valve of inner diameter D, resistance coefficient K, connected to a pipe in which the friction factor is fT. Which of the following is true about its equivalent length Le? A. Le is the length of a straight pipe of the same diameter that would have the same resistance. B. The value of Le/D is called the equivalent length ratio. C. Le is proportional to the resistance coefficient K. D. The friction factor fT is to be computed in the zone of complete turbulence. E. All of the above Answer: ____________ Question 11. Which of the following is NOT a type of valve used in fluid distribution systems? A. Butterfly valve B. Angle valve C. Gate valve D. Check valve E. None of the above Answer: ____________ Question 12. Which of the following valves can be used to throttle the fluid flow in a system? A. Gate valve. B. Foot valve with strainer. C. Globe valve. D. Check valve. E. None of the above Answer: ____________ Question 13. Which of the following is true about a check valve? A. A check valve allow flow in one direction while stopping flow in the opposite direction. B. A swing check valve type produces less energy loss than the ball type one. C. A minimum flow velocity is required to cause a check valve to completely open. D. A check valve produces higher energy losses at low flow rates. E. All of the above Answer: ____________ Question 14. Which of the following is considered “fitting” as the term applies to fluid mechanics? A. Elbows B. Tees C. Expansions D. Contractions E. All of the above Answer: ____________ Question 15. Which of the following is NOT true about a foot valve? A. A foot valve performs a similar function to that of a check valve. B. Foot valves are used at the inlet suction pipe of pumps. C. Foot valves are equipped with a strainer to reduce energy loss. D. A poppet disc foot valve type dissipates more energy than a hinged type one.. E. None of the above Answer: ____________ Question 16. Which of the following is NOT true about plastic valves? A. Plastic valves are used where excellent corrosion resistance is required. B. Plastic valves are applied in numerous industries where contamination control is required. C. Pressure limits are typically lower for plastic valves than for metal valves. D. Temperature limits are generally higher for plastic valves than for metal valves. E. None of the above Answer: ____________ Series Pipeline Systems Question 17. Which of the following statements is true about a series pipeline system? A. In a series pipeline system the fluid follows a single flow path. B. The total energy loss between two points is the sum of all individual losses between those points. C. The weight flow rate at any two points of the system is always the same. D. The weight flow rate is the same at any point of the system. E. All of the above Answer: ____________ Question 18. Which of the following statements is NOT a typical objective of a class I (one) series pipeline system? A. Determine the size of pipe that will carry a given volume flow rate. B. Compute the pressure at some point of interest. C. Compute the total head on a pump. D. Compute the elevation of a source of fluid. E. All of the above Answer: ____________ Question 19. Which of the following statements is a typical objective of a class II (two) series pipeline system? A. Determine the allowable pressure drop at key points in the system. B. Determine the pipe sizes. C. Determine the volume flow rate of the fluid that could be delivered by the system. D. Determine the system elevations. E. All of the above Answer: ____________ Question 20. Which of the following statements is a typical objective of a class III (three) series pipeline system? A. Determine the volume flow rate of the fluid that could be delivered by the system. B. Determine the total head on the pump. C. Determine the total energy taken away from the fluid by actuators. D. Determine the pipe sizes. E. All of the above Answer: ____________ P2. Review Assignment Problems NOTE: Handwritten work is not acceptable. All work must be typed and submitted on a Word Document. a. Identify and list all variables from the problem. b. Write the equation(s) you will use that are found in the textbook. Do not use any other equations. c. Substitute your variables into the equation. YOU MUST INCLUDE UNITS IN ALL PLACES OF YOUR EQUATIONS. d. You must show all of your work, even “simple” calculations. During your calculations, please use 3 decimal places or 3 significant decimal places. This does not apply to financial cost calculations. e. Clearly identify your answer with correct units. · CORRECT METHOD: · INCORRECT METHOD: p2 = (W * a)/g + p1 = a^2 - Ap – μ = 0 Problem1 Determine the energy loss due to a sudden enlargement from a 50 mm OD × 2.4 mm wall plastic pipe to a 90 mm OD × 2.8 mm wall plastic pipe when the velocity of flow is 3 m/s in the smaller pipe. Problem 2 Determine the energy loss due to a sudden enlargement from a standard 1-in Schedule 80 pipe to a 3 1/2-in Schedule 80 pipe when the rate of flow is 0.10 ft3/s. Problem 3 Determine the energy loss due to a gradual enlargement from a 25 mm OD × 2.0 mm wall copper hydraulic tube to an 80 mm OD × 2.80 mm wall tube when the velocity of flow is 3 m/s in the smaller tube and the cone angle of the enlargement is 20. Problem 4 Determine the energy loss when 0.04 m3/s of water flows from a DN 150 standard Schedule 40 pipe into a large reservoir. Problem 5 Determine the energy loss when oil with a specific gravity of 0.87 flows from a 4-in pipe to a 2-in pipe through a sudden contraction if the velocity of flow in the larger pipe is 4.0 ft/s. Problem 6 Determine the energy loss for a gradual contraction from a DN 125 Schedule 80 steel pipe to a DN 50 Schedule 80 pipe for a flow rate of 500 L/min. The cone angle for the contraction is 105. Problem 7 Determine the energy loss that will occur if water flows from a reservoir into a pipe with a velocity of 3 m/s if the configuration of the entrance is (a) an inward-projecting pipe, (b) a square-edged inlet, (c) a chamfered inlet, or (d) a well-rounded inlet. Problem 8 Determine the equivalent length in meters of pipe of a fully open gate valve placed in a DN 250 Schedule 40 pipe. Problem 9 Determine the pressure drop across a 90 standard elbow in a DN 65 Schedule 40 steel pipe if water at 15C is flowing at the rate of 750 L/min. Problem 10 Consider the portion of a hydraulic circuit shown below. The pressure at point B must be 200 psig when the volume flow rate is 60 gal/min. The hydraulic fluid has a specific gravity of 0.90 and a dynamic viscosity of 6.0 x 10-5 lb∙s/ft2. The total length of pipe between A and B is 50 ft. The elbows are standard. Calculate the pressure at the outlet of the pump at A. 25ft MET330 Week 3 AssignmentPage 1