1
Which of the following statements depict the actual benefit of a VFD.
2
Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
3
Which of the following statements is correct?
4
In which of the following circumstances should a VFD be used?
5
A VFD provides soft start and soft stop that helps:
6
A VFD is a device used to change the frequency of the alternating:
Test results
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01.
Q: Which of the following statements depict the actual benefit of a VFD.
A: It converts input frequency of 50 Hz or 60 Hz to an output frequency that is twice the input frequency.
01.
Q: Which of the following statements depict the actual benefit of a VFD.
A: It is used to avoid cavitation.
01.
Q: Which of the following statements depict the actual benefit of a VFD.
A: It provides soft start and soft stop, thereby, minimising the risk of water hammer in the system.
02.
Q: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
A: Throttle control
02.
Q: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
A: Modifying impeller diameter
02.
Q: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
A: Speed control
03.
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.
03.
Q: Which of the following statements is correct?
A: Installing a VFD with the main pivot typically saves 50% of the energy.
03.
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.
04.
Q: In which of the following circumstances should a VFD be used?
A: If an irrigation system has unchanged flow and pressure requirements.
04.
Q: In which of the following circumstances should a VFD be used?
A: If an irrigation system has more than one zone.
04.
Q: In which of the following circumstances should a VFD be used?
A: Most common flood irrigation systems.
05.
Q: A VFD provides soft start and soft stop that helps:
A: Reduce water consumption.
05.
Q: A VFD provides soft start and soft stop that helps:
A: Eliminate risk of water hammer.
05.
Q: A VFD provides soft start and soft stop that helps:
A: Save up to 20% energy.
06.
Q: A VFD is a device used to change the frequency of the alternating:
A: Current
06.
Q: A VFD is a device used to change the frequency of the alternating:
A: Energy
06.
Q: A VFD is a device used to change the frequency of the alternating:
A: Efficiency