10 questions Intermediate

ECADEMY test

37 - Grundfos SQ/SQE

This course test contains 10 questions and can be retaken at any time.

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Question 5 of 10 Intermediate

5 Which are the two most common applications in which a Grundfos SQ/SQE submersible pump is used?

Question 7 of 10 Intermediate

7 Which of these isn’t a key dry-run protection benefit for the installer?

Question 8 of 10 Intermediate

8 What must the supply voltage lie between in order for the SQ/SQE pump to deliver a flow of water?

Question 9 of 10 Intermediate

9 What happens if the water level in the well drops below the inlet?

Question 10 of 10 Intermediate

10 How many times higher than nominal speed does the motor current reach during the first milliseconds?

Question 10 of 10 Intermediate

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Correct
Q: What is the benefit of a slow increase in speed?
A: It keeps the motor current low
Correct
Q: Why is correct sizing of the submersible pump important?
A: Because an undersized pump will not be able to deliver the required flow and pressure and an oversized pump reduces energy efficiency, which increases operational costs.
Correct
Q: The 3” SQ pump is obviously ideal for new boreholes but where can it also be used?
A: In original 4” boreholes where sediments over the years have narrowed the hole.
Correct
Q: Why is it important to protect the pump from over- and under voltage?
A: Because large variations in power supply will damage the motor over time.
Correct
Q: Which are the two most common applications in which a Grundfos SQ/SQE submersible pump is used?
A: Domestic water supply & Irrigation
Correct
Q: Why must the pump unit be installed below the dynamic water table?
A: To avoid the risk of dry-running during operation.
Correct
Q: Which of these isn’t a key dry-run protection benefit for the installer?
A: He doesn’t have to worry about water bursts
Correct
Q: What must the supply voltage lie between in order for the SQ/SQE pump to deliver a flow of water?
A: Between 150 V and 315 V
Correct
Q: What happens if the water level in the well drops below the inlet?
A: The motor power consumption stays the same
Correct
Q: How many times higher than nominal speed does the motor current reach during the first milliseconds?
A: Seven times higher