Which of the following is one correct method to avoid cavitation?
What causes cavitation?
Identify the correct formula for calculating pump efficiency.
Which of the following items are built-in in some motors and can stop the motor if it exceeds a preset temperature:
Identify the false statement.
What are the effects of cavitation on pumps?
Select the three parameters of most interest in water pumping systems:
Test results
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Q: Which of the following is one correct method to avoid cavitation?
A: Reduce the friction loss in the suction pipe.
Q: Which of the following is one correct method to avoid cavitation?
A: Increase the flow of the pump.
Q: Which of the following is one correct method to avoid cavitation?
A: Lower the elevation of the suction water level.
Q: What causes cavitation?
A: Cavitation occurs when water changes its state from vapour to water at low pressure.
Q: What causes cavitation?
A: Cavitation occurs when water boils at 100°C and changes its state from water to vapour at normal atmospheric pressure.
Q: What causes cavitation?
A: Cavitation occurs when water flows through a pipe and a valve is closed quickly at a low atmospheric pressure
Q: Friction loss is dependent on the [xxxxxxxx] of the fluid.
A: Viscosity
Q: Friction loss is dependent on the [xxxxxxxx] of the fluid.
A: Velocity
Q: Friction loss is dependent on the [xxxxxxxx] of the fluid.
A: Volume
Q: Identify the correct formula for calculating pump efficiency.
A: (P1 × Q)/(c × H)
Q: Identify the correct formula for calculating pump efficiency.
A: (p x H × Q)/(367 × P1)
Q: Identify the correct formula for calculating pump efficiency.
A: (H × P1)/(c × Q)
Q: Which of the following items are built-in in some motors and can stop the motor if it exceeds a preset temperature:
A: Temperature sensors
Q: Which of the following items are built-in in some motors and can stop the motor if it exceeds a preset temperature:
A: Signal wire
Q: Which of the following items are built-in in some motors and can stop the motor if it exceeds a preset temperature:
A: Insulation system
Q: Identify the false statement.
A: Cavitation can occur when water is flowing in a pipe and a valve is closed too quickly.
Q: Identify the false statement.
A: The MP204 device can protect the pump motor against all possible disturbances that may occur.
Q: Identify the false statement.
A: The only way to avoid sand from entering a pump is through effective filtering before the pump inlet.
Q: What are the effects of cavitation on pumps?
A: Breakage of rotor
Q: What are the effects of cavitation on pumps?
A: Pitting of suction pipe
Q: What are the effects of cavitation on pumps?
A: Pitting of impeller and pump housing
Q: Select the three parameters of most interest in water pumping systems:
A: Flow, head and energy
Q: Select the three parameters of most interest in water pumping systems:
A: Flow, conductivity and head
Q: Select the three parameters of most interest in water pumping systems:
A: Head, turbidity and velocity