Question 1 of 6
Intermediate

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

Question 2 of 6
Intermediate

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

Question 3 of 6
Intermediate

In which of the following circumstances should a VFD be used?

Question 4 of 6
Intermediate

A VFD provides soft start and soft stop that helps:

Question 5 of 6
Intermediate

When a VFD is installed with a pump, what happens if the valve for one irrigation zone is closed and other is open?

Question 6 of 6
Intermediate

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

Question 6 of 6
Intermediate

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1: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
Throttle control
1: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
Modifying impeller diameter
1: Which of the following pump performance regulation approaches does not allow for manual nor automatic flow/pressure adjustments?
Speed control
2: A VFD is a device used to change the frequency of the alternating:
Current
2: A VFD is a device used to change the frequency of the alternating:
Energy
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2: A VFD is a device used to change the frequency of the alternating:
Efficiency
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3: In which of the following circumstances should a VFD be used?
If an irrigation system has unchanged flow and pressure requirements.
3: In which of the following circumstances should a VFD be used?
If an irrigation system has more than one zone.
3: In which of the following circumstances should a VFD be used?
Most common flood irrigation systems.
4: A VFD provides soft start and soft stop that helps:
Reduce water consumption.
4: A VFD provides soft start and soft stop that helps:
Eliminate risk of water hammer.
4: A VFD provides soft start and soft stop that helps:
Save up to 20% energy.
5: 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.
5: 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.
5: 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.
6: 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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6: Which of the following statements depict the actual benefit of a VFD.
It is used to avoid cavitation.
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6: 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.