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:
A VFD is a device used to change the frequency of the alternating:
Which of the following statements is correct?
When a VFD is installed with a pump, what happens if the valve for one irrigation zone is closed and other is open?
Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
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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: 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: 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: 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.
Q: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
A: Throttle control
Q: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
A: Modifying impeller diameter
Q: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
A: Speed control