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Debre Markos University Technology College Mechanical Engineering Department

This document contains instructions and questions for a fluid mechanics exam being administered at Debre Markos University's Technology College Mechanical Engineering Department. The exam contains 4 questions worth a total of 20 points. Question 1 involves calculating velocity gradient and shear stress in fluid flow over a plate. Question 2 involves calculating total pressure and center of pressure on a triangular plate immersed in water. Question 3 involves calculating flowrate through a variable area pipe. Question 4 involves calculating anchoring forces required to hold a converging elbow steady in fluid flow turning through 135 degrees.

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Addisu Dagne
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342 views4 pages

Debre Markos University Technology College Mechanical Engineering Department

This document contains instructions and questions for a fluid mechanics exam being administered at Debre Markos University's Technology College Mechanical Engineering Department. The exam contains 4 questions worth a total of 20 points. Question 1 involves calculating velocity gradient and shear stress in fluid flow over a plate. Question 2 involves calculating total pressure and center of pressure on a triangular plate immersed in water. Question 3 involves calculating flowrate through a variable area pipe. Question 4 involves calculating anchoring forces required to hold a converging elbow steady in fluid flow turning through 135 degrees.

Uploaded by

Addisu Dagne
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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DEBRE MARKOS UNIVERSITY

TECHNOLOGY COLLEGE
MECHANICAL ENGINEERING DEPARTMENT

FLUID MECHANICS (MENG 2113) TEST

Exam Date: 03-May-2019 Time Allowed: 2.5 hrs


Examiners: Addisu D. & Manohar R. Total Marks Allocated: 20

INSTRUCTIONS:
 You can start from any question.
 Show all your steps clearly.
 Draw diagrams and sketches clearly
 State your assumptions clearly if any.
 Any form of cheating will result in automatic dismissal from the exam room and
cancelation of the marks that you might get in the exam.

Name: _____________________________ ID.No.________________ Sec._______

For Examiner’s use only

Q# Q1 Q2 Q3 Q4 Total (20%)
Marks
Obtained
Fluid Mechanics Mid-exam 04/05/2019

1. If the velocity distribution over a plate is given by


𝑢 = 2𝑦 − 𝑦 2
where u is velocity in meter per second at a distance y meters above the plate, determine
the velocity gradient and the shear stress at
i. the boundary, y = 0 and
ii. y= 0.15 m.
Take dynamic viscosity of fluid as 9 poises. (3 Points)

2. A triangular plate of 1 meter base and 1.5 meter height as shown in figure 1 is immersed
in water. The plane of the plate is inclined at 30o with the free surface and the base is
parallel to and at a depth of 2 meters from the water surface. Find the total pressure on the
plate and the position of the center of pressure. (4 Points)

Fig. 1

DMU, Mechanical Engineering Department 1


Fluid Mechanics Mid-exam 04/05/2019

3. Air flows steadily through the variable area pipe shown in Fig.2. Determine the flowrate
if viscous and compressibility effects are negligible. (5 Points)

Fig. 2
4. A converging elbow turns water through an angle of 135 o in a vertical plane as shown in
Fig. 3. The flow cross section diameter is 400 mm at the elbow inlet, section (1), and 200
mm at the elbow outlet, section (2). The elbow flow passage volume is 0.5 m3 between
sections (1) and (2). The water volume flowrate is 0.3 m3/s and the elbow inlet and outlet
pressures are 300 kPa and 200 kPa. The elbow mass is 50 kg. Calculate the horizontal (x
direction) and vertical (z direction) anchoring forces required to hold the elbow in place.
(8 Points)

DMU, Mechanical Engineering Department 2


Fluid Mechanics Mid-exam 04/05/2019

DMU, Mechanical Engineering Department 3

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