circie only one answer (a, b, c, d, or e) for the following questions about pump
ID: 3281500 • Letter: C
Question
circie only one answer (a, b, c, d, or e) for the following questions about pumps Which of the following(s) is correct statement a bout pumps? (s Points) Pumps can work in parallel systems and not series When blades forced to move fluid, we have a pump. The most commonly used pumps are centrifugal. All of the above (b) and (c). move because of the fluid force, we have a turbine; when blades are C. Which of the following(s) is co 70 System Curve 60 50 Svstem & Pump Curve 40 30 Pump Curve 20 10 10 20 30 40 50 60 70 80 90 100 Flow - Litres/second Fig.4 a. The best operating point (BOP) is at approximately (45 m, 70 L/s) b. Maximum head-loss is approximately 55 m. c. Efficiency and Net Positive Suction Head Required/Available should be considere avoid cavitation. d. Static head is approximately 17 m. e. All of the above.Explanation / Answer
Question 1)
The right option is (e).
This is because option (a) is false. Pumps can work in both series and parallel connections.
Question 2)
The right option is again (e)
From the graph , we see that at 0 flow rate, there is still a head of approximately 17 metres. That would be the static head.
The curves cross at the point 45m, 70L/s . This would make it the BOI. If we move to lesser flow rates, the pump is working at a higher head but the system does not need that high a pressure. We need to increase the flow rate.
To the right of the point, the pump is incapable of dealing with the system's pressure.So, it is not possible to pump water.
The highest pump head is around 65 meters and the curve ends at 10 meters. So, the head loss is 55 meters.
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