MEEN 345 EXAM 2 QUESTIONS AND VERIFIED
ANSWERS
Names of Labs:
Lab 1: Fluid Viscosity & Viscometers
Lab 2: Flow Visualization
Lab 3: Pressure Gauge Calibration
Lab 4: Bernoulli's Theory
Lab 5: Impact of Jets
Lab 6: Flow Through an Orifice
Lab 7: Pressure Distribution on a Cylindrical Cylinder
Lab 8: Flow Measurment Methods & Two-Stage Centrifugal Pump Test
Lab 9: Pipe Flow Head Loss - Answers - if the quiz number and question number is
given in the question then that means to refer to the equation sheet or the picture in the
quiz
Which of the followings is not the objectives of Lab 6?
Determine the discharge coefficient of the flow through an orifice
Determine the contraction coefficient of the flow through an orifice
Determine the velocity coefficient of the flow through an orifice
Verify the relation between the head and the flow rate through an orifice
Determine the head loss through piping systems - Answers - Determine the head loss
through piping systems
Choose the location of the Vena Contracta from the flow through an orifice.
(Pre Lab 6)
1 (at water level in tank)
2 (at narrowest point in orifice/exit)
3 (at the end of the orifice/exit) - Answers - 2
What is the use of the pointer in the picture? (Pre Lab 6)
To measure the diameter of the jet
To measure the stagnation pressure of the jet
To locate the position of the Vena Contracta of the jet
To establish the datum line - Answers - To measure the diameter of the jet
What is the use of the Pitot tube in the picture? (Pre Lab 6)
To measure the diameter of the jet
To measure the stagnation pressure of the jet
To locate the position of the Vena Contracta of the jet
, To establish the datum line - Answers - To measure the stagnation pressure of the jet
You predicted the flow rate through an orifice using continuity and Bernoulli's equation.
The actual flow rate was less than the predicted flow rate. What is the most probable
cause?
The predicted result disregarded all frictional effects.
The predicted result assumed constant fluid properties.
The predicted result assumed uniform fluid velocity across the orifice.
The predicted result assumed incompressible and steady fluid flow. - Answers - The
predicted result disregarded all frictional effects.
The volumetric flow rate, Q through the orifice is measured with the decreasing water
level, H in the tank. What is the relationship between the volumetric flow rate and the
pressure head in the tank?
Q proportional H
Q proportional to H^2
Q proportional sqrt(H)
Q proportional log(H) - Answers - Q proportional sqrt(H)
A fluid passes through a sharp-edged orifice in the base of the tank. Two manometers
are installed: the manometer A connects to a Pitot tube which is positioned at the vena
contracta of the fluid stream, the other manometer B connects to a pressure tapping in
the base of the tank. Compare the heights of three water levels: manometer column A
and B, and water tank, C. (Post Lab 6, Q 2)
A>B=C
A<B=C
A<B<C
A>B>C - Answers - A<B=C
In question 2, what is the reason of different heads in manometers A and B?
frictional head loss through the orifice
acceleration of water due to gravity
elevation head difference
velocity head difference - Answers - frictional head loss through the orifice
Which of the following is not an objective of Lab 7?
Measure the mean pressure distribution around the circumference of a circular cylinder
for three fluid speeds
Use a multi-tube manometer system to measure the pressures distribution
Measure the drag force exerted on the cylinder by means of a force dynamometer
Calculate the net force on the cylinder due to the pressure distribution
ANSWERS
Names of Labs:
Lab 1: Fluid Viscosity & Viscometers
Lab 2: Flow Visualization
Lab 3: Pressure Gauge Calibration
Lab 4: Bernoulli's Theory
Lab 5: Impact of Jets
Lab 6: Flow Through an Orifice
Lab 7: Pressure Distribution on a Cylindrical Cylinder
Lab 8: Flow Measurment Methods & Two-Stage Centrifugal Pump Test
Lab 9: Pipe Flow Head Loss - Answers - if the quiz number and question number is
given in the question then that means to refer to the equation sheet or the picture in the
quiz
Which of the followings is not the objectives of Lab 6?
Determine the discharge coefficient of the flow through an orifice
Determine the contraction coefficient of the flow through an orifice
Determine the velocity coefficient of the flow through an orifice
Verify the relation between the head and the flow rate through an orifice
Determine the head loss through piping systems - Answers - Determine the head loss
through piping systems
Choose the location of the Vena Contracta from the flow through an orifice.
(Pre Lab 6)
1 (at water level in tank)
2 (at narrowest point in orifice/exit)
3 (at the end of the orifice/exit) - Answers - 2
What is the use of the pointer in the picture? (Pre Lab 6)
To measure the diameter of the jet
To measure the stagnation pressure of the jet
To locate the position of the Vena Contracta of the jet
To establish the datum line - Answers - To measure the diameter of the jet
What is the use of the Pitot tube in the picture? (Pre Lab 6)
To measure the diameter of the jet
To measure the stagnation pressure of the jet
To locate the position of the Vena Contracta of the jet
, To establish the datum line - Answers - To measure the stagnation pressure of the jet
You predicted the flow rate through an orifice using continuity and Bernoulli's equation.
The actual flow rate was less than the predicted flow rate. What is the most probable
cause?
The predicted result disregarded all frictional effects.
The predicted result assumed constant fluid properties.
The predicted result assumed uniform fluid velocity across the orifice.
The predicted result assumed incompressible and steady fluid flow. - Answers - The
predicted result disregarded all frictional effects.
The volumetric flow rate, Q through the orifice is measured with the decreasing water
level, H in the tank. What is the relationship between the volumetric flow rate and the
pressure head in the tank?
Q proportional H
Q proportional to H^2
Q proportional sqrt(H)
Q proportional log(H) - Answers - Q proportional sqrt(H)
A fluid passes through a sharp-edged orifice in the base of the tank. Two manometers
are installed: the manometer A connects to a Pitot tube which is positioned at the vena
contracta of the fluid stream, the other manometer B connects to a pressure tapping in
the base of the tank. Compare the heights of three water levels: manometer column A
and B, and water tank, C. (Post Lab 6, Q 2)
A>B=C
A<B=C
A<B<C
A>B>C - Answers - A<B=C
In question 2, what is the reason of different heads in manometers A and B?
frictional head loss through the orifice
acceleration of water due to gravity
elevation head difference
velocity head difference - Answers - frictional head loss through the orifice
Which of the following is not an objective of Lab 7?
Measure the mean pressure distribution around the circumference of a circular cylinder
for three fluid speeds
Use a multi-tube manometer system to measure the pressures distribution
Measure the drag force exerted on the cylinder by means of a force dynamometer
Calculate the net force on the cylinder due to the pressure distribution
