A VFD is a device used to change the frequency of the alternating:
In which of the following circumstances should a VFD be used?
Which of the following statements is correct?
Which of the following statements depict the actual benefit of a VFD.
To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
When a VFD is installed with a pump, what happens if the valve for one irrigation zone is closed and other is open?
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Q: A VFD is a device used to change the frequency of the alternating:
A: Current
Q: A VFD is a device used to change the frequency of the alternating:
A: Energy
Q: A VFD is a device used to change the frequency of the alternating:
A: Efficiency
Q: In which of the following circumstances should a VFD be used?
A: If an irrigation system has unchanged flow and pressure requirements.
Q: In which of the following circumstances should a VFD be used?
A: If an irrigation system has more than one zone.
Q: In which of the following circumstances should a VFD be used?
A: Most common flood irrigation systems.
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.
Q: Which of the following statements is correct?
A: Installing a VFD with the main pivot typically saves 50% of the energy.
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.
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.
Q: Which of the following statements depict the actual benefit of a VFD.
A: It is used to avoid cavitation.
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.
Q: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
A: Energy and pressure
Q: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
A: Flow and energy
Q: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
A: Flow and pressure
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.
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.
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.