Question 1 of 8
Basic

What does QH curve show?

Question 2 of 8
Basic

Can centrifugal pumps be connected directly to an asynchronous motor?

Question 3 of 8
Basic

What does ‘NPSH’ stand for in the NPSH-curve?

Question 4 of 8
Basic

Are axial flow impellers used in closed pump designs?

Question 5 of 8
Basic

What kind of pumps would normally NOT have a radial flow impeller?

Question 6 of 8
Basic

Centrifugal pumps can be categorised into the following groups…

Question 7 of 8
Basic

In a pump curve, head, power consumption, efficiency and NPSH are shown as a function of…

Question 8 of 8
Basic

What is a main disadvantage of a centrifugal pump?

Question 8 of 8
Basic

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1: What does QH curve show?
Flow at a given head
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1: What does QH curve show?
Head at a given flow
1: What does QH curve show?
Overall efficiency
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2: Can centrifugal pumps be connected directly to an asynchronous motor?
Yes
2: Can centrifugal pumps be connected directly to an asynchronous motor?
No
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2: Can centrifugal pumps be connected directly to an asynchronous motor?
Only in the case of immersible pumps
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3: What does ‘NPSH’ stand for in the NPSH-curve?
Net potential surface heat
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3: What does ‘NPSH’ stand for in the NPSH-curve?
Net peripheral suction height
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3: What does ‘NPSH’ stand for in the NPSH-curve?
Net positive suction head
4: Are axial flow impellers used in closed pump designs?
Yes
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4: Are axial flow impellers used in closed pump designs?
Sometimes
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4: Are axial flow impellers used in closed pump designs?
No
5: What kind of pumps would normally NOT have a radial flow impeller?
Circulating pumps
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5: What kind of pumps would normally NOT have a radial flow impeller?
Immersible pumps
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5: What kind of pumps would normally NOT have a radial flow impeller?
Sewage treatment pumps
6: Centrifugal pumps can be categorised into the following groups…
Forward flow, backward flow, static flow
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6: Centrifugal pumps can be categorised into the following groups…
Vertical flow, horizontal flow, diagonal flow
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6: Centrifugal pumps can be categorised into the following groups…
Radial flow, mixed flow, axial flow
7: In a pump curve, head, power consumption, efficiency and NPSH are shown as a function of…
Performance
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7: In a pump curve, head, power consumption, efficiency and NPSH are shown as a function of…
The type of pump
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7: In a pump curve, head, power consumption, efficiency and NPSH are shown as a function of…
Flow
8: What is a main disadvantage of a centrifugal pump?
They require a lot of maintenance
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8: What is a main disadvantage of a centrifugal pump?
They contain a lot of moving parts
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8: What is a main disadvantage of a centrifugal pump?
They cannot create suction by themselves