1
In which of the following circumstances should a VFD be used?
2
Which of the following statements depict the actual benefit of a VFD.
3
A VFD is a device used to change the frequency of the alternating:
4
To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
5
A VFD provides soft start and soft stop that helps:
6
When a VFD is installed with a pump, what happens if the valve for one irrigation zone is closed and other is open?
Test results
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01.
Q: In which of the following circumstances should a VFD be used?
A: If an irrigation system has unchanged flow and pressure requirements.
01.
Q: In which of the following circumstances should a VFD be used?
A: If an irrigation system has more than one zone.
01.
Q: In which of the following circumstances should a VFD be used?
A: Most common flood irrigation systems.
02.
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.
02.
Q: Which of the following statements depict the actual benefit of a VFD.
A: It is used to avoid cavitation.
02.
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.
03.
Q: A VFD is a device used to change the frequency of the alternating:
A: Current
03.
Q: A VFD is a device used to change the frequency of the alternating:
A: Energy
03.
Q: A VFD is a device used to change the frequency of the alternating:
A: Efficiency
04.
Q: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
A: Energy and pressure
04.
Q: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
A: Flow and energy
04.
Q: To achieve high irrigation efficiency in all types of irrigation, it is important to be able to control the:
A: Flow and pressure
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: 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.
06.
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.
06.
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.