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CEME 2003 Civil Engineering Hydraulics
Total Points (35 Marks) Writing Time: Upload Time: Total Duration: 50 mins 10 mins 60 mins
INSTRUCTIONS FOR CANDIDATES Candidates must answer 3 questions, ALL of which should be attempted.
Not all questions are of equal value. Please plan your time accordingly. Show all calculations and assumptions.
If you believe that a parameter or an important piece of information has been inadvertently omitted by the examiner,
assume a suitable value, clearly stating it, and continue with the solution. Responses must be uploaded to the
submission portal within the time limit (i.e. 3:00 pm)*. Time for uploading your responses has already been factored into
the quiz length. It is your responsibility to check that you have uploaded the correct file. PERMITTED MATERIALS
This is open-book, time-limited quiz. You can use any course materials. The quiz is an individual task and is being conducted under test conditions.
No discussion or consultation about the quiz with any third party is permitted during the quiz period.
Students found in breach of the above instructions may be reported through the University’s Academic Integrity Policy. *
The submission deadline for students with alternative exam arrangements may differ slightly. QUESTIONS BEGIN OVERLEAF Page 2 of 4 QUESTION 1 (13 marks)
(a) Determine the deflection of the manometer, h, in the system shown in Figure 1, knowing that the specific gravity of Mercury is 13.6. (5 Marks) Figure 1: Configuration of the manometer system (b) The shaft of the gate will fail at a moment of 145 kN.m. Determine the maximum value of the liquid depth h. (8 Marks) Figure 2: Configuration of a submerged gate Page 3 of 4 QUESTION 2 (15 marks) (a) If the overall efficiency of the system and turbine in Figure 3 is 80 percent, what power is produced for H= 58 m and Q= 32 m3/s. (3 Marks) Figure 3: Pipeline and turbine system configuration. (b) Figure 4 shows a horizontal bend that carries water at 10oC. The interior volume of the bend is 0.3 m3, the mass of the bend material is 250 kg, D1 = 80 cm, V1 = 2.5 m/s, and the pressure at section 1 is 50 kPa. Neglect any losses in the bend. If D2 = 40 cm, determine the force components at the flange to hold the bend in place. (12 Marks)
Figure 4: Horizontal bend p2 Page 4 of 4 QUESTION 3 (7 marks) (a) A particular fluid has a density of 1000 kg/m3 and
absolute viscosity of 6.7x10-2 Ns/m2 at 20oC. Find the corresponding (i) kinematic viscosity, (ii) specific weight and
(iii) specific gravity. (3 Marks) (a) A smooth pipe 300 mm in diameter is designed to carry oil, with a
kinematic viscosity of 4x10-6 m2/s, is to be modelled with a smooth pipe 15 cm in diameter carrying water at 20oC.
If the mean velocity of the prototype is 1.5 m/s, what should the mean velocity of the water in the model be to ensure similitude? (4 Marks)