Question 1 of 8
Basic

Select the three parameters of most interest in water pumping systems:

Question 2 of 8
Basic

What causes cavitation?

Question 3 of 8
Basic

How is the relationship between these three factors described in an equation?

Question 4 of 8
Basic

How can friction loss in a system be minimised?

Question 5 of 8
Basic

Identify the correct formula for calculating pump efficiency.

Question 6 of 8
Basic

Identify the reasons for reduction in pump performance from the given options:

Question 7 of 8
Basic

Identify the false statement.

Question 8 of 8
Basic

What are the effects of cavitation on pumps?

Question 8 of 8
Basic

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1: Select the three parameters of most interest in water pumping systems:
Flow, head and energy
1: Select the three parameters of most interest in water pumping systems:
Flow, conductivity and head
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1: Select the three parameters of most interest in water pumping systems:
Head, turbidity and velocity
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2: What causes cavitation?
Cavitation occurs when water changes its state from vapour to water at low pressure.
2: What causes cavitation?
Cavitation occurs when water boils at 100°C and changes its state from water to vapour at normal atmospheric pressure.
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2: What causes cavitation?
Cavitation occurs when water flows through a pipe and a valve is closed quickly at a low atmospheric pressure
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3: How is the relationship between these three factors described in an equation?
P = Q x H x c
3: How is the relationship between these three factors described in an equation?
Q = H x P x c
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3: How is the relationship between these three factors described in an equation?
P = Q/H x c
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4: How can friction loss in a system be minimised?
By increasing the pipe diameter
4: How can friction loss in a system be minimised?
By using 2 smaller pumps instead of one bigger pump
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4: How can friction loss in a system be minimised?
By adding a Tee to the piping system
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5: Identify the correct formula for calculating pump efficiency.
(P1 × Q)/(c × H)
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5: Identify the correct formula for calculating pump efficiency.
(p x H × Q)/(c × P1)
5: Identify the correct formula for calculating pump efficiency.
(H × P1)/(c × Q)
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6: Identify the reasons for reduction in pump performance from the given options:
Bad power supply
6: Identify the reasons for reduction in pump performance from the given options:
Reduction in size of irrigation zone
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6: Identify the reasons for reduction in pump performance from the given options:
Changes in energy requirements
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7: Identify the false statement.
Cavitation can occur when water is flowing in a pipe and a valve is closed too quickly.
7: Identify the false statement.
The MP204 device can protect the pump motor against all possible disturbances that may occur.
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7: Identify the false statement.
The only way to avoid sand from entering a pump is through effective filtering before the pump inlet.
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8: What are the effects of cavitation on pumps?
Breakage of rotor
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8: What are the effects of cavitation on pumps?
Pitting of suction pipe
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8: What are the effects of cavitation on pumps?
Pitting of impeller and pump housing