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 2 of 8 Intermediate

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

Question 3 of 8 Intermediate

In which areas is there a bigger risk of pumping corrosive groundwater?

Question 8 of 8 Intermediate

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

Question 8 of 8 Intermediate

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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: 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: In which areas is there a bigger risk of pumping corrosive groundwater?
A: In coastal areas
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: 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: Why is it important to know the water drawdown?
A: The more the drawdown increases during pump operation, the more pressure is required to lift the groundwater to the surface
Correct
Q: What can be done to the well if sand continues to enter a well after the well development has been carried out?
A: The well driller can try to run the pump at its maximum capacity in short periods of time over a couple of days
Correct
Q: What should the minimum flow past the motor be to ensure sufficient motor cooling?
A: 0,15 m/s