Question

Explain the primary difference between a positive displacement pump and a centrifugal pump. Give an example of a practical application for each pump.

Answer 1

Positive displacement pump	non positive displacement (centrifugal pump)
)a pressure increase in efficiency of pump also increase.	at higher or lower in this efficiency decrease.
Positive displacement pumps are low capacity high head pump.	Centrifugal pump are high capacity and low head pump.
Positive displacement pumps moves the fluid at same speed regardless of pressure on inlet or outlet.	Whereas centrifugal will do this.
positive displacement pump works for high pressure application.	centrifugal pump are basically used for low pressure application.
Flow is constant with changing pressure.	Flow is varies with changing pressure.

Vane pump is used for low viscosity liquids,gear pump is used for pumping the high viscosity liquid.and these flows under positive displacement pumps.

Centrifugal pump is falls under non positive displacement pumps category and application of centrifugal pump is used in domestic purpose,waste management and agriculture field, various industries.