Fluid Mechanics N6 — Document

August 2018 — N6 — Fluid Mechanics

N6 2018 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 6 pages 📝 35 items found

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Q1— Section header —

1.1Differentiate between the hydraulic mean depth and hydraulic gradient OTE: Do not use formulae to differentiate.

1.2Water flows at 4 m/s when entering a pipe with an inlet diameter of 90 mm and an outlet diameter of 150 mm. Calculate the velocity at exit (3\

1.3Refer to the FIGURE 1 below and determine the hydraulic mean depth if the tank is half filled with water FIGURE 1 (3\

1.4Refer to the FIGURE 2 below and determine the head loss due to sudden enlargement. NB : h FIGURE 2 (6\

1.5Two reservoirs are connected by means of a pipe 650 m long and 150 mm in diameter. The surface of the water in the upper reservoir is 25 m above the level of water in the lower reservoir. Take f = 0,002

1.5.1The sum of all the head losses in terms of V (the velocity of water in the pipe\ (7\

1.5.2The v elocity of water in the pipe (2\

1.5.3The discharge (2\ [25] 3 m 5 m 900 mm25

Q2— Section header —

2.1FIGURE 3 below shows a cross section trapezoidal channel with a gradient of 1 in 8 500 th at is to be designed to deliver 8 m /s of water. Tak

2.1.1The depth (d\f the water flowing (10\

2.1.2The width (b\f the channel (2\

2.2A 90 V notch has a coefficient of discharge of 0,7 and the head above the bottom of the notch is 800 mm. Calculate the quantity of water in l/s. (4\

2.3A tank, 2,5 m high, standing on the ground is kept full of water. There is an orifice in its vertical side at a depth h metres below the surface. Calculate the value of h in order for the jet to strike the ground at a maximum

Q3— Section header —

3.1A pump supplies water at a pressure of 6,5 MN/m to one end of a pipeline. The pipeline is 3,5 km long and has a diameter of 250 mm. Assume f = 0,006 and that maximum power is achieved when the head loss is a quarter of the

3.2Below are the specification of a new operating reciprocating pump: Stroke Plunger diameter

3.2.1The acceleration head during suction stroke (2\

3.2.2The acceleration head during delivery stroke (2\

3.2.3The friction head during suction stroke (2\

3.2.4The friction head during delivery stroke (2\

3.2.5

3.3A fan extracts 8 m /s air at a pressure of 200 Pa through a 50 m long circular duct. he coe fficient of friction is 0,00445. Determine the diameter (in mm\of the duct through which the air is flowing.

Q4— Section header —

4.1In an inward flow reaction turbine the supply head is 15 m and the maximum discharge is 0,82 m /s. The e xternal diameter = 2 (internal diameter\ and the

4.1.1The velocity of flow (2\

4.1.2The theoretical head (2\

4.1.3Inlet tangential velocity of runner (2\

4.1.4The guide vane angle (2\

4.1.5The vane angle at exit for radial discharge (4\

4.1.6The external and internal diameters (3\

4.2

4.2.1The maximum hydraulic efficiency of the runner (3\

4.2.220

Mark Allocation

Total100 marks

Sections25 + 25 + 30 + 20 = 100 marks

Paper information

TitleDocument

SubjectFluid Mechanics

LevelN6

Document typeQuestion paper

Year2018

MonthAugust

Pages6

Downloads4

Examination context

Decade2010s

Years ago8y

SeasonWinter (SH)

Start dayWednesday

Exam periodAugust 2018

Days since exam2,993

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