Centrifugal Pump Basics

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What is the main function of a centrifugal pump?

Convert mechanical energy into hydraulic energy (correct)
Generate centrifugal force from pressure energy
Convert pressure energy into mechanical energy
Transform hydraulic energy into potential energy

In which direction does the flow occur in a centrifugal pump?

Radial inward direction
Axial inward direction
Radial outward direction (correct)
Tangential direction

What is the principle of flow on which a centrifugal pump operates?

Laminar flow
Forced vortex flow (correct)
Compressible flow
Turbulent 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 (C) Signup and view all the answers

Which part of a centrifugal pump consists of backward curved vanes?

Impeller (D) Signup and view all the answers

What connects the impeller of a centrifugal pump to an electric motor?

Shaft (A) Signup and view all the answers

What is the purpose of the precautions against cavitation mentioned in the text?

To prevent damage to metallic surfaces and reduce noise and vibrations (B) Signup and view all the answers

How does cavitation affect the efficiency of a turbine according to the text?

Cavitation decreases the efficiency of a turbine due to pitting action (D) Signup and view all the answers

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 (D) Signup and view all the answers

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 (B) Signup and view all the answers

How is cavitation resistance in hydraulic systems typically enhanced?

By using materials like aluminium-bronze and stainless steel (C) Signup and view all the answers

What does NPSH stand for in relation to pumps?

Net Positive Suction Head (D) Signup and view all the answers

What is the purpose of the casing in a centrifugal pump?

To convert kinetic energy into pressure energy (B) Signup and view all the answers

What function do impellers connected in series perform in a multistage centrifugal pump?

To increase the head (C) Signup and view all the answers

What is the role of a foot valve in a centrifugal pump system?

To allow one-way flow into the suction pipe (C) Signup and view all the answers

In a multistage centrifugal pump, how are impellers connected to achieve high discharge?

In parallel (D) Signup and view all the answers

What is the main consequence of cavitation in pumps?

Formation of pitting on metallic surfaces (D) Signup and view all the answers

Which type of valve is commonly fitted at the lower end of the suction pipe in a centrifugal pump system?

Foot valve (C) Signup and view all the answers

What is the effect of connecting impellers in series in a multistage centrifugal pump on water pressure?

Increases pressure (D) Signup and view all the answers

How does a delivery pipe differ from a suction pipe in a centrifugal pump system?

It delivers water to a required height (B) Signup and view all the answers