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Chemical Engineering
6.You are tasked with managing the construction of a promenade at Umhlanga. Many times, during the construction process, it is required that sand slurry be pumped to different locations on the construction site. The pipeline that transports the sand slurry is manufactured from mild steel. In this particular scenario based only on the information given, what type of corrosion would you expect to occur?
Select one:
a. Galvanic Corrosion
b. Erosion Corrosion
c. Cavitation Corrosion
d. Stress Corrosion
e. None of the options
7.A car-body-panel stamping machine applies a load of 7.4 tons to the mould beneath its stamping ram. The mould is held in place with four tool steel bolts of 12mm diameter. The machine usually stamps 2500 body panels per month. Use the S-N diagram below to predict after approximately how many years the bolts will be expected to break.
Select one:
a. Galvanic Corrosion
b. Erosion Corrosion
c. Cavitation Corrosion
d. Stress Corrosion
e. None of the options
7.A car-body-panel stamping machine applies a load of 7.4 tons to the mould beneath its stamping ram. The mould is held in place with four tool steel bolts of 12mm diameter. The machine usually stamps 2500 body panels per month. Use the S-N diagram below to predict after approximately how many years the bolts will be expected to break.
Chemical Engineering
1.You are designing the windows of an airplane. Would you design them as squares, ovals, or hexagons? Justify your answer.
2.During fatigue testing, why is it necessary to hang a mass piece underneath the test specimen?
3.Calculate the strain hardening exponent “n” for an alloy in which true stress of 520MPa produces a true strain of 0,1. (Use K = 1035MPa).
4.What do you understand by the term “fully reversed cyclic loading”?
5.Cavitation occurs when:
Select one:
a. You drink too much coke
b. An electrode anodically corrodes a base material
c. Crystalline alloys loose grains
d. A bubble implodes
e. None of the options
2.During fatigue testing, why is it necessary to hang a mass piece underneath the test specimen?
3.Calculate the strain hardening exponent “n” for an alloy in which true stress of 520MPa produces a true strain of 0,1. (Use K = 1035MPa).
4.What do you understand by the term “fully reversed cyclic loading”?
5.Cavitation occurs when:
Select one:
a. You drink too much coke
b. An electrode anodically corrodes a base material
c. Crystalline alloys loose grains
d. A bubble implodes
e. None of the options
Chemical Engineering
Pure water was used to remove 90% ammonia from the gas mixture in packed bed tower. The gas mixture which contain 5 mol% NH3 enters from the bottom of the column at flow rate of 100 kmol/h. Pure water enters from the top of the column at a flow rate 1.5 times minimum pure water flow rate (1.5 L’ min). The column cross sectional area is 0.20 m2. The equilibrium relationship for NH3 and water is given by y = 0.8915x. The film mass transfer coefficients are given as k’ya = 0.0739 kmol/s.m3 and k’xa = 0.169 kmol/s.m3.
Determine the height of the packed tower using liquid film mass transfer coefficient, k’xa.
Chemical Engineering
Water at 20"C is to be pumped through the system shown below. p The operating data for this motor-driven pump are as follows: Capacity, m''s x 10* Developed head, m Efficiency. ***** ** ******** ************* s6.6 35.9 9.1 34.1 0 31.2 41.0 ----------------==-- ---- The inlet pipe to the pump is 0.06 m in diameter commercial steel and 8.5 m in length with a fanning friction factor of 0.0046. The discharge line consists of 60 m of 0.06 m diameter steel pipe. All valves are fully open globe valves. Determine the flow rate through the system.
Chemical Engineering
A centrifugal pump is to be placed above a large, open water tank, as shown in the figure below,
and is to pump water at a rate of 0.0142 m3
/s.
At this flowrate the required net positive suction head, NPSHR, is 4.572 m, as specified by the
pump manufacturer. The water temperature is 30 ºC and atmospheric pressure is 101.325 kPa.
Assume that the major head loss between the tank and the pump inlet is due to filter at the pipe
inlet having a minor loss of 3.1 m. The pipe on the suction side of the pump has a diameter of
0.1016 m. Determine the maximum height, z1, that the pump can be located above the water
surface without cavitation
and is to pump water at a rate of 0.0142 m3
/s.
At this flowrate the required net positive suction head, NPSHR, is 4.572 m, as specified by the
pump manufacturer. The water temperature is 30 ºC and atmospheric pressure is 101.325 kPa.
Assume that the major head loss between the tank and the pump inlet is due to filter at the pipe
inlet having a minor loss of 3.1 m. The pipe on the suction side of the pump has a diameter of
0.1016 m. Determine the maximum height, z1, that the pump can be located above the water
surface without cavitation
Chemical Engineering
Water at 20 ºC is to be pumped through the system.
The operating data for this motor-driven pump are as follows:
Capacity, m^3/s x 10^4 Developed head, m Efficiency, %
0 36.6 0
10 35.9 19.1
20 34.1 32.9
30 31.2 41.6
40 27.5 42.2
50 23.3 39.7
The inlet pipe to the pump is 0.06 m in diameter commercial steel and 8.5 m in length with a
fanning friction factor of 0.0046. The discharge line consists of 60 m of 0.06 m diameter steel
pipe. All valves are fully open globe valves. Determine the flow rate through the system.
The operating data for this motor-driven pump are as follows:
Capacity, m^3/s x 10^4 Developed head, m Efficiency, %
0 36.6 0
10 35.9 19.1
20 34.1 32.9
30 31.2 41.6
40 27.5 42.2
50 23.3 39.7
The inlet pipe to the pump is 0.06 m in diameter commercial steel and 8.5 m in length with a
fanning friction factor of 0.0046. The discharge line consists of 60 m of 0.06 m diameter steel
pipe. All valves are fully open globe valves. Determine the flow rate through the system.
Chemical Engineering
The inlet pipe to the pump is 0.06 m in diameter commercial steel and 8.5 m in length with a
fanning friction factor of 0.0046. The discharge line consists of 60 m of 0.06 m diameter steel
pipe. All valves are fully open globe valves. Determine the flow rate through the system.
fanning friction factor of 0.0046. The discharge line consists of 60 m of 0.06 m diameter steel
pipe. All valves are fully open globe valves. Determine the flow rate through the system.
Chemical Engineering
A steam power plant operates on the Rankine cycle with superheat. The cycle consists of a boiler, a turbine and a pump. Superheated steam enters the turbine at 40 bar and 400oC. The steam leaves the turbine in a wet state. The wet steam is then condensed in the condenser at a pressure of 1.0 bar.
The isentropic efficiency of the turbine (expansion process) is 0.88. The isentropic efficiency of the pump (compression process) is 0.75.
You are required to: (a) Sketch a block diagram of the cycle. (the processes are to be numbered as: Boiler 4-1; Turbine 1-2; Condenser 2-3; Pump 3-4) (b) Sketch the cycle on a T-s diagram. (c) Determine the cycle efficiency, the work ratio and specific steam consumption.
The isentropic efficiency of the turbine (expansion process) is 0.88. The isentropic efficiency of the pump (compression process) is 0.75.
You are required to: (a) Sketch a block diagram of the cycle. (the processes are to be numbered as: Boiler 4-1; Turbine 1-2; Condenser 2-3; Pump 3-4) (b) Sketch the cycle on a T-s diagram. (c) Determine the cycle efficiency, the work ratio and specific steam consumption.
Chemical Engineering
Determine the cycle efficiency, the work ratio and specific steam consumption
Chemical Engineering
the terminal velocity of particles in gas is influenced by which parameter
