1
In which of the following circumstances should a VFD be used?
2
Which of the following statements is correct?
3
Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
4
When a VFD is installed with a pump, what happens if the valve for one irrigation zone is closed and other is open?
5
A VFD is a device used to change the frequency of the alternating:
6
To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
Test results
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01.
Q: In which of the following circumstances should a VFD be used?
A: If an irrigation system has unchanged flow and pressure requirements.
01.
Q: In which of the following circumstances should a VFD be used?
A: If an irrigation system has more than one zone.
01.
Q: In which of the following circumstances should a VFD be used?
A: Most common flood irrigation systems.
02.
Q: Which of the following statements is correct?
A: A VFD is typically used when there is more than one irrigation zone, and every zone has different water requirements.
02.
Q: Which of the following statements is correct?
A: Installing a VFD with the main pivot typically saves 50% of the energy.
02.
Q: Which of the following statements is correct?
A: Integration of monitoring controls and variable speed is not helpful if the farmer wants to remotely manage irrigation.
03.
Q: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
A: Throttle control
03.
Q: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
A: Modifying impeller diameter
03.
Q: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
A: Speed control
04.
Q: When a VFD is installed with a pump, what happens if the valve for one irrigation zone is closed and other is open?
A: A pressure sensor notifies the VFD to reduce the pressure, and thereby speed of the pump.
04.
Q: When a VFD is installed with a pump, what happens if the valve for one irrigation zone is closed and other is open?
A: The pressure decreases in the zone that is open.
04.
Q: When a VFD is installed with a pump, what happens if the valve for one irrigation zone is closed and other is open?
A: The power consumption increases by almost 50% compared with both zones open.
05.
Q: A VFD is a device used to change the frequency of the alternating:
A: Current
05.
Q: A VFD is a device used to change the frequency of the alternating:
A: Energy
05.
Q: A VFD is a device used to change the frequency of the alternating:
A: Efficiency
06.
Q: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
A: Energy and pressure
06.
Q: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
A: Flow and energy
06.
Q: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
A: Flow and pressure