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MET330 202001E Applied Fluid Mechanics
Instructor: Francie Baker, Ph.D.
Week 3 Review Assignment
I pledge to support the Honor System of ECPI. I will refrain from any form of academic
dishonesty or deception, such as cheating or plagiarism. I am aware that as a member of the
academic community, it is my responsibility to turn in all suspected violators of the honor code. I understand that any failure on my part to support the Honor System will be turned over to a
Judicial Review Board for determination. I will report to the Judicial Review Board hearing if
summoned.
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 MET330 Week 3 Assignment
Page 1
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: _____E_______ 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: _____
D
_______ 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: _____D_______ 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: _____E_______
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 MET330 Week 3 Assignment
Page 2
Answer: _____C_______ 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: _____E_______ 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: _____D_______ 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: ____E________
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 MET330 Week 3 Assignment
Page 3
Answer: _____E_______ Question 10.
Consider a valve of inner diameter D
, resistance coefficient K
, connected to a pipe in which the friction factor is f
T
. Which of the following is true about its equivalent length L
e
? A. L
e is the length of a straight pipe of the same diameter that would have the same resistance. B. The value of L
e
/D is called the equivalent length ratio. C. L
e is proportional to the resistance coefficient K. D. The friction factor f
T is to be computed in the zone of complete turbulence. E. All of the above Answer: _____D_______ 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: ______E______ 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: ______C______
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 MET330 Week 3 Assignment
Page 4
Answer: _____E_______ 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: _____E_______ 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: ______E______ 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: _____D_______
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. MET330 Week 3 Assignment
Page 5
E. All of the above Answer: _______E_____ 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: ______A______ 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: _____C_______ 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: ______D______
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.
W
rite the equation(s) you will use that are found in the textbook
. Do not use any other equations.
MET330 Week 3 Assignment
Page 6
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