Question 1 of 8
Basic

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

Question 2 of 8
Basic

What are the effects of cavitation on pumps?

Question 3 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 4 of 8
Basic

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

Question 5 of 8
Basic

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

Question 6 of 8
Basic

Friction loss is dependent on the [xxxxxxxx] of the fluid.

Question 7 of 8
Basic

How can friction loss in a system be minimised?

Question 8 of 8
Basic

What causes cavitation?

Question 8 of 8
Basic

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1: Which of the following is one correct method to avoid cavitation?
Reduce the friction loss in the suction pipe.
1: Which of the following is one correct method to avoid cavitation?
Increase the flow of the pump.
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1: Which of the following is one correct method to avoid cavitation?
Lower the elevation of the suction water level.
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2: What are the effects of cavitation on pumps?
Breakage of rotor
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2: What are the effects of cavitation on pumps?
Pitting of suction pipe
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2: What are the effects of cavitation on pumps?
Pitting of impeller and pump housing
3: Which of the following items are built-in in some motors and can stop the motor if it exceeds a preset temperature:
Temperature sensors
3: 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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3: 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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4: Identify the reasons for reduction in pump performance from the given options:
Bad power supply
4: Identify the reasons for reduction in pump performance from the given options:
Reduction in size of irrigation zone
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4: Identify the reasons for reduction in pump performance from the given options:
Changes in energy requirements
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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: Friction loss is dependent on the [xxxxxxxx] of the fluid.
Viscosity
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6: Friction loss is dependent on the [xxxxxxxx] of the fluid.
Velocity
6: Friction loss is dependent on the [xxxxxxxx] of the fluid.
Volume
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7: How can friction loss in a system be minimised?
By increasing the pipe diameter
7: How can friction loss in a system be minimised?
By using 2 smaller pumps instead of one bigger pump
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7: How can friction loss in a system be minimised?
By adding a Tee to the piping system
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8: What causes cavitation?
Cavitation occurs when water changes its state from vapour to water at low pressure.
8: What causes cavitation?
Cavitation occurs when water boils at 212°F and changes its state from water to vapour at normal atmospheric pressure.
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8: 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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