Fluid Mechanics N5 — Document

November 2022 — N5 — Fluid Mechanics

N5 2022 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 2 pages 📝 73 items found 📚 1 topics

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Q1— Section header —

1.1Indicate whether the followin g statements are TRUE or FALSE by writing only 'True' or 'F alse' next to the question number (1.1 .1

1.1.6 \in the ANSWER BOOK.

1.1.1Gauge pressure is the intensity of pressure measured above or below atmospheric pressure.

1.1.2A perfect vacuum is a completely empty space in which gauge pressure is measured at 101 C.

1.1.3bsolute pressure is the sum of gauge pressure and atmospheric pressure.

1.1.4The viscosity layer (film\of any liquid substance used in a mechanical system for lubrication purpose decrease with respect to any rise in temperature within the system.

1.1.5There is no loss in power due to viscous resistance between a journal bearing and a moving part ( e.g. shaft\if there is layer of a lubricating agent between the two parts.

1.1.6

1.2Briefly define each of the following terms:

1.2.1The r elative density of a fluid

1.2.2

1.3A 50 mm diameter solid shaft rotates inside a plain bearing with an inside diameter of 50,2 mm and a length of 100 mm. The dynamic viscosity of the fluid lubricant is 0,355 Pa.s when the shaft rotates inside the bearing with a rotational

1.3.1The circumferential velocity of the rotating shaft in m/s (2\

1.3.2The area in contact between the plain bearing and the shaft in m (2\

1.3.3The mechanical force required to overcome the viscous resistance in ewtons (4\

1.3.4The mechanical power generated by shaft to overcome the viscous resistance in atts (2\ [20] 819020520

Q2— Section header —

2.1Name any THREE basic types of press machines used in the mechanical industry. (3\

2.2What is the function of a hydraulic actuator device? (2\

2.3A hydraulic machine used to lift loads of material consist of a hollow master cylinder with an internal diameter of 120 mm with a stroke length of 600 mm

2.3.1The pressure generated inside the master cylinder by the piston force in kPa (2\

2.3.2The effective bulk modulus of the hydraulic machine in GPa (3\

2.3.3The free play on the piston of the master cylinder in mm (3\

Q2— Section header —

2.4.1The bulk modulus of the air leaked into the cylinder in kPa, if the air constant is 1,4 (2\

2.4.2The effective bulk modulus of the hydraulic machine under the new conditions in MPa (3\

2.4.3The free play on the piston of the master cylinder under the new conditions in mm (2\ [20] 819020520

Q3— Section header —

3.1Briefly define each of the following terms:

3.1.1The hydrostatic force acting on a plane of a submerged surface

3.1.2The buoyancy force of a fluid

3.1.3

3.2A balloon is completely filled with a fluid until a diameter of 200 mm is achieved. The balloon is now placed on the sea waterline (surface\where its total volume is submerged by 36% below the sea waterline. The density of the sea water is

3.2.1The total volume of the sea displaced by the balloon placed on its waterline in m HINT: (3\

3.2.2The total mass of the balloon in kilograms (2\

3.2.3The total density of the balloon in kg/m (2\

3.2.4The percentage draught of the balloon if it is placed on the surface of the sea water (3\

3.2.5The required mass of fluid to be added in the balloon in order to fully submerge it in sea water while maintaining the same diameter parameters of the balloon in kilograms (4\ [20]20

Q4— Section header —

4.1Define each of the following terms:

4.1.1Stream tube (tube of flow\

4.1.2Volumetric flow rate

4.1.3

4.2A company pipeline network system is used to deliver diesel oil with a density of 920 kg/m to four diesel oil substations. The four substation pipelines are connected and fed from a single main pipeline of 225 mm diameter, and the

4.2.1The total volumetric flow rate of the diesel oil flowing along the main pipeline in litres per second (2\

4.2.2The mass flow rate of the diesel oil flowing along the main pipeline in tons per minute (3\

4.2.3The volumetric flow rate of the diesel oil flowing in the 105 mm diameter section in litres per second 2\

4.2.4The diesel oil volumetric flow rate in each of the two identical pipelines in litres per second (5\

4.2.5The diameter of each of the two identical pipelines in mm if each pipeline has a flow velocity of 4,756 m/s (2\ [20] 819020520

Q5— Section header —

5.1Indicate whether the followin g statements are TRUE or FALSE by writing only 'True' or 'F alse' next to the question number (

5.1.5\in the ANSWER BOOK.

5.1.1An orifice plate flow meter is more accurate than a venturi flow meter when measuring the volumetric flow of a fluid flowing in a pipeline

5.1.2The pressure head of a fluid flowing system is measured in Pa

5.1.3A r otameter is a mechanical device or tool used to measure the flow of fluid

5.1.4he throat section of a venturi flow meter generate the highest pressure energy when determin ing the flow rate in a pipeline

5.1.5

5.2A pitot tube is placed in a 500 mm diameter pipeline in which diesel with a density of 832 kg/m is flowing The pitot tube is connected to a U tube mercury

5.2.1The change in pressure head for the diesel along the pipeline in metr (3\

5.2.2The diesel theoretical velocity of flow in m/s under the pressure head

Q5— Section header —

5.2.3The diesel maximum velocity of flow along the pipeline in m/s if the coefficient of velocity is 0,96 (2\

5.2.4The diesel average velocity of flow along the pipeline in m/s (2\

5.2.5The average volumetric flow rate along the pipeline in litres per minute (3\

5.2.6The actual discharge rate of flow in litres per hour for 6 hour if the pitot tube coefficient of meter is 0,92 (3\ [20]20

Q6— Section header —

6.1(2\

6.2Name ny TWO types of flow that can be found in fluid

6.3.1The length to diameter ratio of the system (5\

6.3.2The total head loss generated by the system in metr s with the aid (4\

6.3.3The flow velocity of water running through the pipeline into the reservoir in m/s (3\

6.3.4The volumetric flow rate of the pipeline system in litres for a 24 hour routine maintenance period (4\ [20] TOTAL20

Topics Identified

Forms of Ownership

Mark Allocation

Total100 marks

Sections20 + 20 + 20 + 20 + 20 + 20 = 120 marks

Paper information

TitleDocument

SubjectFluid Mechanics

LevelN5

Document typeQuestion paper

Year2022

MonthNovember

Pages10

Downloads7

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,442

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