Fluid Mechanics N5 — Document
April 2018 — N5 — Fluid Mechanics
N5
2018
Nated Engineering
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Q1— Section header —
1.1Define the term kinematic viscosity and give its units
1.2If oil with a high viscosity is used for the lubrication of bearings, what impact wi ll it have on the motion and the power?
1.3A shaft with a diameter of 120 mm rotates in a sleeve 120, mm in diameter at 1 100 r/min. he sleeve is 100 mm long and is lubricated by an oil with a dynamic viscosity of 0,42 Pa.s.
1.3.1The power loss to viscous forces in the bearing (9\
1.3.2The maximum rotational frequency of the shaft to limit the maximum power loss to 3 kW, with no changes to other variables
1.3.3The kinematic viscosity of the oil if it has a mass density of 900 kg/m [20]20
Q2— Section header —
2.1Define the function of a hydraulic accumulator in a fluid flowing system.
2.2Briefly explain the impact of the presence of air in a hydraulic system in relation to free play, cylinders and pipes. (2\
2.3A cylinder 80 mm in diameter and 250 mm long is filled with a fluid with an isothermal bulk modulus of 2,5 GPa. A force of 3 000 N is applied onto a piston in the cylinder. Calculate the play on the piston
2.3.1If no air is present and the expansion of the cylinder is ignored (6\
2.3.2If 3% of the of elasticity of the cylinder material is 210 GPa. [20]20
Q3— Section header —
3.1A gate in a channel is 2 m wide and 1 m deep. The gate is hinged at the top with two hinges and the lower point is kept closed with a bolt 2 m lower than the two hinges. The water surface is at the top of the gate.
3.1.1Find the load on the bolt and the hinges
3.1.2If the gate is in a water reservoir where its centre is 12 m below the water surface, determine the hydrostatic force under these conditions
3.2A 50 ton ship is sailing in seawater with a density o f 1 035 kg/m
3.2.1The volume of seawater displaced by the ship
3.2.2The volume of seawater w hich could be displaced by the ship if the ship was sailing in fresh water
3.2.3The mass of cargo that is loaded on the ship if 30% more volume of seawater was displaced than the volume in
Q3— Section header —
Q4— Section header —
4.1A 3 m tank must be filled with oil in an estimated time of 1,25 hours. Determine the following:
4.1.1The rate of flow required under these conditions
4.1.2The velocity of flow in the pipe if a 30 mm diameter pipe is connected to the side of the tank
4.1.3The weight flow if the specific gravity of the oil is 0,95
4.1.4The type of flow in the pipe system if the kinematic viscosity of the oil is 0,065 Pa.s
4.2Define the following terms which are used to describe the flow of a fluid
4.2.1A stream line
4.2.2A steam tube 8190205
4.2.3A path line (1\
4.2.4Lamina flow (2\
4.2.5Turbulent flow (2\ [20]20
Q5— Section header —
5.1Give the function of each of the following in a luid flowing system
5.1.1A rota flow meter
5.1.2
5.2A pitot tube is used to measure the flow rate of air with a density of 1,3 kg/m in a 150 mm diameter pipe. An oil manometer is used to measure the pressure difference between the pitot tube and the static port in the side of the
5.3A valve and a filter must be installed into a pipeline. The valve has an ratio of 8 and the filter has an of 6. The velocity of flow is 3 m/s and the frictional coefficient of the pipe is 0,007. Determine the pressure drop over
Q6— Section header —
6.1Draw the complete velocity diagram for the above turbine. Use a scale of cm = 2 m/s for the construction of the velocity diagram Marks will be deducted for
6.2From the velocity diagram
Q6— Section header —
6.2.1The moving blade inlet and outlet angle
6.2.2The relative velocities at the inlet and outlet of the moving blade
6.2.3The angle and velocity of the water exiting the turbine
6.2.4The total whirl or vortex velocity
6.2.5The power generated by the turbine
6.2.6The turbine overall efficiency (12\ [20]20
Mark Allocation
Total100 marks
Sections20 + 20 + 20 + 20 + 20 + 20 = 120 marks
Paper information
TitleDocument
SubjectFluid Mechanics
LevelN5
Document typeQuestion paper
Year2018
MonthApril
Pages8
Downloads2
Examination context
Decade2010s
Years ago8y
SeasonAutumn (SH)
Start daySunday
Exam periodApril 2018
Days since exam3,114
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