8 questions Intermediate

ECADEMY test

17 - Groundwater Pumping

This course test contains 8 questions and can be retaken at any time.

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Question 1 of 8 Intermediate

How does over- and under voltage, phase unbalance and phase loss impact the pump motor?

Question 4 of 8 Intermediate

What should the minimum flow past the motor be to ensure sufficient motor cooling?

Question 7 of 8 Intermediate

What may cause friction loss in the pipes?

Question 8 of 8 Intermediate

By-pass control is an efficient way of performance regulating a pump but what is the downside of the process?

Question 8 of 8 Intermediate

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Correct
Q: How does over- and under voltage, phase unbalance and phase loss impact the pump motor?
A: It raises the motor temperature, reducing the lifetime
Correct
Q: What could be the consequences of using an undersized pump in a well?
A: The pump may not be able to deliver the required capacity
Correct
Q: How is it possible to protect the motor against bad power supply?
A: By means of an electronic motor protection that senses all possible deviations
Correct
Q: What should the minimum flow past the motor be to ensure sufficient motor cooling?
A: 0,15 m/s
Correct
Q: What is well development?
A: A process that ensures that the well’s sand filter has been improved so the well produces clean, sand-free water
Correct
Q: Why is it a good idea to make a well where the groundwater level is as high as possible?
A: The shorter the distance is to the water the less expensive it is to make the borehole and subsequently to pump the water to the surface
Correct
Q: What may cause friction loss in the pipes?
A: Scaling
Correct
Q: By-pass control is an efficient way of performance regulating a pump but what is the downside of the process?
A: Energy is wasted as the pump continues to run at full speed