Question 1 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:

Question 2 sur 6
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Which of the following statements depict the actual benefit of a VFD.

Question 3 sur 6
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A VFD is a device used to change the frequency of the alternating:

Question 4 sur 6
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In which of the following circumstances should a VFD be used?

Question 5 sur 6
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A VFD provides soft start and soft stop that helps:

Question 6 sur 6
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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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1: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
Energy and pressure
1: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
Flow and energy
1: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
Flow and pressure
2: 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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2: Which of the following statements depict the actual benefit of a VFD.
It is used to avoid cavitation.
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2: 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.
3: A VFD is a device used to change the frequency of the alternating:
Current
3: A VFD is a device used to change the frequency of the alternating:
Energy
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3: A VFD is a device used to change the frequency of the alternating:
Efficiency
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4: In which of the following circumstances should a VFD be used?
If an irrigation system has unchanged flow and pressure requirements.
4: In which of the following circumstances should a VFD be used?
If an irrigation system has more than one zone.
4: In which of the following circumstances should a VFD be used?
Most common flood irrigation systems.
5: A VFD provides soft start and soft stop that helps:
Reduce water consumption.
5: A VFD provides soft start and soft stop that helps:
Eliminate risk of water hammer.
5: A VFD provides soft start and soft stop that helps:
Save up to 20% energy.
6: When a VFD is installed with a pump, what happens if the valve for one irrigation zone is closed and other is open?
A pressure sensor notifies the VFD to reduce the pressure, and thereby speed of the pump.
6: When a VFD is installed with a pump, what happens if the valve for one irrigation zone is closed and other is open?
The pressure decreases in the zone that is open.
6: When a VFD is installed with a pump, what happens if the valve for one irrigation zone is closed and other is open?
The power consumption increases by almost 50% compared with both zones open.