Question 1 of 8
Basic

What are the effects of cavitation on pumps?

Question 2 of 8
Basic

Which of the following items are built-in in some motors and can stop the motor if it exceeds a preset temperature:

Question 3 of 8
Basic

Which of the following parameters is not used for calculating pump efficiency?

Question 4 of 8
Basic

How can friction loss in a system be minimised?

Question 5 of 8
Basic

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

Question 6 of 8
Basic

Identify the correct formula for calculating pump efficiency.

Question 7 of 8
Basic

What causes cavitation?

Question 8 of 8
Basic

Which of the following is one correct method to avoid cavitation?

Question 8 of 8
Basic

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1: What are the effects of cavitation on pumps?
Breakage of rotor
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1: What are the effects of cavitation on pumps?
Pitting of suction pipe
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1: What are the effects of cavitation on pumps?
Pitting of impeller and pump housing
2: Which of the following items are built-in in some motors and can stop the motor if it exceeds a preset temperature:
Temperature sensors
2: Which of the following items are built-in in some motors and can stop the motor if it exceeds a preset temperature:
Signal wire
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2: Which of the following items are built-in in some motors and can stop the motor if it exceeds a preset temperature:
Insulation system
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3: Which of the following parameters is not used for calculating pump efficiency?
Flow
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3: Which of the following parameters is not used for calculating pump efficiency?
Time
3: Which of the following parameters is not used for calculating pump efficiency?
Pressure
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3: Which of the following parameters is not used for calculating pump efficiency?
Power Consumption
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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: Select the three parameters of most interest in water pumping systems:
Flow, head and energy
5: Select the three parameters of most interest in water pumping systems:
Flow, conductivity and head
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5: Select the three parameters of most interest in water pumping systems:
Head, turbidity and velocity
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6: Identify the correct formula for calculating pump efficiency.
(P1 × Q)/(c × H)
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6: Identify the correct formula for calculating pump efficiency.
(p x H × Q)/(c × P1)
6: Identify the correct formula for calculating pump efficiency.
(H × P1)/(c × Q)
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7: What causes cavitation?
Cavitation occurs when water changes its state from vapour to water at low pressure.
7: 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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7: 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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8: Which of the following is one correct method to avoid cavitation?
Reduce the friction loss in the suction pipe.
8: Which of the following is one correct method to avoid cavitation?
Increase the flow of the pump.
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8: Which of the following is one correct method to avoid cavitation?
Lower the elevation of the suction water level.
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