Correct option is A
Priming:- Priming is an operation in which the suction pipe, casing of the pump, and a portion of the
delivery pipe are completely filled up by water from an outside source before starting the pump.
• In other words, Priming is the process in which the impeller of a centrifugal pump will get fully
submerged in liquid without any air trap inside. It is always advisable to start the pump only after
primping.
• Priming is an operation that generally that happens in the centrifugal pump.
• Priming is required in order to drive out the air voids present, which otherwise would make the operation of the pump ineffective.
•Because the pressure energy imparted by the centrifugal pump is proportional to the density of the
liquid and if any air pocket exists in the casing, then only a negligible amount of pressure would be
generated.This pressure might not be sufficient for the lifting of the liquid. Hence, priming becomes essential
