Fluid Mechanics N5 — Document
August 2021 — N5 — Fluid Mechanics
N5
2021
Nated Engineering
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Q1— Section header —
1.1What is the purpose of a bearing lubrication process in a mechanism? (2\
1.2Give any TWO advantages of a bearing lubrication process in a mechanism. (2\
1.3Define the absolute coefficient of viscosity of a fluid and relate the kinematic viscosity in relation to this value (include units\ (3\
1.4shaft with a diameter of 150 mm rotates inside a bearing with a diameter of 150,3 mm which is 170 mm long at a rotational frequency of 1 200 r/min. The oil lubricating this bearing has an absolute coefficient of viscosity of 0,02 Pa.s
1.4.1The power loss due to viscous forces in kW (8\
1.4.2The kinetic viscosity of the oil in m /s (2\
1.4.3The power loss due to viscous forces if the shaft is not rotating, but moves axially through the bearing with a velocity of 5 m/s in kW (3\ [20]20
Q2— Section header —
2.1A hydraulic motor vehicle hoist has a cylinder of 680 mm diameter and a plunger diameter of 42,5 mm. Determine each of the following below:
2.1.1The force that is required on the plunger to raise a vehicle with a mass of 2 250 kg (3\
2.1.2The number of strokes that will be necessary to lift the vehicle by 3,4 m if the plunger has a stroke of 425 mm (3\
2.1.3The work done in hoisting the vehicle to a height of 3,4 m (2\
2.1.4Neglecting losses and assuming that the hoist moves at a steady rate, what power would be required to drive the plunger if the vehicle hoist is lifted 3,4 m in 51 seconds (2\ (8190205\
2.2cylinder with a diameter of 60 mm is filled with hydraulic fluid with an isothermal bulk modulus of 2,035 GPa. The length of the cylinder filled with the fluid is 170 mm and the effective Young's modulus of elasticity for the cylinder
2.2.1The cylinder stroke volume in m (2\
2.2.2The pressure exerted due to the force applied to the piston (2\
2.2.3The bulk modulus of air in MPa if (1\
2.2.4The effective bulk modulus in MPa, if there is 3,44% air present in the system (3\
2.2.5The play on the piston due the presence of air in the cylinder (2\ [20]20
Q3— Section header —
3.1A cylindrical tank with a diameter of 1,45 m and length of 3,75 m is mounted on its side with its length horizontal. If the tank is full of oil with a relative density of 0,963, determine each of the following below:
3.1.1The hydrostatic pressure applied on the circular of the tank in kPa (3\
3.1.2The hydrostatic force exerted on the circular of the tank in kN (2\
3.1.3The centre of mass (gravity\n m (2\
3.1.4The position of this hydrostatic from the top surface oil in mm (3\
3.2An iron marble of 5 cm in diameter is dropped from a height into a small container full of glycerine with a density 1 260 kg/m . The marble displaces the glycerine with 7,5% of its volume above the free surface of the glycerine.
3.2.1The weight of the iron marble exerted on the glycerine (4\ 1,4 (8190205\ Copyright reserved Please turn over
3.2.2The density of the iron marble (2\
3.2.3The total weight required to fully submerge the iron marble in kg (4\ [20]20
Q4— Section header —
4.1Define each of the following terms which are used to describe the flow of fluid:
4.1.1A stream line
4.1.2A stream tube
4.1.3A path line
4.1.4urbulent flow
4.1.5
4.2liquid flows through a hole out of a container in 22 seconds. Determine the following:
4.2.1The rate of flow of liquid through the 45 mm hole in m /s (1\
4.2.2The velocity of flow through the hole (2\
4.3A municipal water main with an internal diameter of 425 mm has a connection leading from the main, gradually tapering to a pipe 6,8 m below with an internal diameter of 212,5 mm. Water in the small pipe is at a pressure of 1
4.3.1The velocity of flow in the 425 mm diameter pipe (2\
4.3.2The velocity of flow in the 212,5 mm diameter pipe (2\
4.3.3Neglect all possible losses and apply Bernoulli's equation to calculate the pressure in the municipal main (3\ [20] (8190205\20
Q5— Section header —
5.1Briefly define an orifice (2\
5.2n orifice with a diameter of 14,5 mm at the bottom of a tank can discharge an average of 4,774 of water per second into the atmosphere at a head of 59,4 m. Determine the following:
5.2.1The theoretical velocity of flow through the orifice (2\
5.2.2The actual velocity of flow through the orifice if the jet diameter just after the vena contract is 13,4 mm (2\
5.2.3The coefficient of contraction (2\
5.2.4The coefficient velocity (2\
5.2.5The coefficient of discharge (2\
5.2.6The head loss through the orifice (3\
5.3An orifice plate meter is fitted to a pipe with a diameter of 340 mm carrying oil with relative density of 0,88. The pressure gauge indicates an average pressure of 6,8 kPa
Q6— Section header —
6.1The weight flow along the bend in N/s (2\
6.2The velocity of flow at the inlet bend (2\
6.3The mass flow rate of oil through the bend in kg/s (2\
6.4The pressure at the outlet if the friction head through the bend is 1,063 m (4\
6.5The momentum force at the inlet to the bend in Newton (1\ (8190205\ Copyright reserved
6.6The force due to the fluid pressure at the inlet to the bend in Newton (1\
6.7The momentum force at the outlet to the bend in Newton (1\
6.8The force due to the fluid pressure at the outlet to the bend in Newton (1\
6.9The magnitude of the resultant force through the bend in kN (4\
6.10The direction of the resultant force through the bend (2\ [20] TOTAL: 100 819020520
Mark Allocation
Total100 marks
Sections20 + 20 + 20 + 20 + 20 + 20 = 120 marks
Paper information
TitleDocument
SubjectFluid Mechanics
LevelN5
Document typeQuestion paper
Year2021
MonthAugust
Pages9
Downloads2
Examination context
Decade2020s
Years ago5y
SeasonWinter (SH)
Start daySunday
Exam periodAugust 2021
Days since exam1,895
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