20 Questions
What is the main function of a centrifugal pump?
Convert mechanical energy into hydraulic energy
In which direction does the flow occur in a centrifugal pump?
Radial outward direction
What is the principle of flow on which a centrifugal pump operates?
Forced vortex flow
Why does the liquid get discharged at the outlet of a centrifugal pump with high pressure head?
Related to the square of tangential velocity
Which part of a centrifugal pump consists of backward curved vanes?
Impeller
What connects the impeller of a centrifugal pump to an electric motor?
Shaft
What is the purpose of the precautions against cavitation mentioned in the text?
To prevent damage to metallic surfaces and reduce noise and vibrations
How does cavitation affect the efficiency of a turbine according to the text?
Cavitation decreases the efficiency of a turbine due to pitting action
How is Net Positive Suction Head (NPSH) defined in the pump industry?
The total suction head required to make liquid flow through a suction pipe to the pump impeller
What is the relationship between the available NPSH and the required NPSH for a pump installation?
The available NPSH must be greater than the required NPSH for cavitation-free operation
How is cavitation resistance in hydraulic systems typically enhanced?
By using materials like aluminium-bronze and stainless steel
What does NPSH stand for in relation to pumps?
Net Positive Suction Head
What is the purpose of the casing in a centrifugal pump?
To convert kinetic energy into pressure energy
What function do impellers connected in series perform in a multistage centrifugal pump?
To increase the head
What is the role of a foot valve in a centrifugal pump system?
To allow one-way flow into the suction pipe
In a multistage centrifugal pump, how are impellers connected to achieve high discharge?
In parallel
What is the main consequence of cavitation in pumps?
Formation of pitting on metallic surfaces
Which type of valve is commonly fitted at the lower end of the suction pipe in a centrifugal pump system?
Foot valve
What is the effect of connecting impellers in series in a multistage centrifugal pump on water pressure?
Increases pressure
How does a delivery pipe differ from a suction pipe in a centrifugal pump system?
It delivers water to a required height
Learn about the basics of centrifugal pumps, hydraulic machines that convert mechanical energy into pressure energy through centrifugal force. Understand the reverse operation compared to inward radial flow reaction turbines.
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