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A VFD is a device used to change the frequency of the alternating:

Question 2 sur 6
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In which of the following circumstances should a VFD be used?

Question 3 sur 6
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To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:

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Which of the following statements is correct?

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Which of the following statements depict the actual benefit of a VFD.

Question 6 sur 6
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Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?

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1: A VFD is a device used to change the frequency of the alternating:
Current
1: A VFD is a device used to change the frequency of the alternating:
Energy
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1: A VFD is a device used to change the frequency of the alternating:
Efficiency
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2: In which of the following circumstances should a VFD be used?
If an irrigation system has unchanged flow and pressure requirements.
2: In which of the following circumstances should a VFD be used?
If an irrigation system has more than one zone.
2: In which of the following circumstances should a VFD be used?
Most common flood irrigation systems.
3: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
Energy and pressure
3: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
Flow and energy
3: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
Flow and pressure
4: Which of the following statements is correct?
A VFD is typically used when there is more than one irrigation zone, and every zone has different water requirements.
4: Which of the following statements is correct?
Installing a VFD with the main pivot typically saves 50% of the energy.
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4: Which of the following statements is correct?
Integration of monitoring controls and variable speed is not helpful if the farmer wants to remotely manage irrigation.
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5: Which of the following statements depict the actual benefit of a VFD.
It converts input frequency of 50 Hz or 60 Hz to an output frequency that is twice the input frequency.
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5: Which of the following statements depict the actual benefit of a VFD.
It is used to avoid cavitation.
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5: Which of the following statements depict the actual benefit of a VFD.
It provides soft start and soft stop, thereby, minimising the risk of water hammer in the system.
6: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
Throttle control
6: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
Modifying impeller diameter
6: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
Speed control