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Top-14 Centrifugal Pump Interview Question-2019!!!


Top-14 Centrifugal Pump Interview Question-2019!!!


Question Number 1: What is Positive displacement pump? Name different types Positive displacement pump?
Answer: Positive displacement pump are those which discharge specific amount & quantity is constant. Positive displacement pumps are that which prevents undesirable flow and pumps the fluid within the closed space.
Positive displacement pumps example are: Multistage pumps, Process type pumps, Chemical process pumps, canned motor pumps, Centrifugal pumps, Paper stroke pumps and deep well turbine pumps.
Question Number 2: Why the Centrifugal Pump is called High Discharge pump?
Answer: Centrifugal pump is a kinetic device. The centrifugal pump uses the centrifugal force to push out the fluid. So the liquid entering the pump receives kinetic energy from the rotating impeller. The centrifugal action of the impeller accelerates the liquid to a high velocity, transferring mechanical (rotational) energy to the liquid. So it discharges the liquid in high rate.

Question Number 3: What does a pump develop? Give reason to support your answer?

Answer: Pump is a device that is used to transfer fluid from one place to another place which means it develops flow not pressure. Pressure is a measurement of the resistance to flow.
Question Number 4: What is NPSH for centrifugal pump?
Answer: NPSH stands for net positive suction head, for any pump to the design & capacity of pump a net pressure head is required which is called net positive suction head. If pressure falls the NPSH, then cavitation will occur. it is net positive suction head to avoid cavitation’s since pressure is below the vapor pressure bubbles forms that cause cavitation’s to avoid these we go for a pressure more than vapor pressure
Question Number 5: What NPSH is and how to calculate it for a centrifugal pump?
Answer: NPSH is net positive suction head of a pump. For centrifugal pumps,
It is calculated as follows:
NPSH = Atmospheric pressure + static head - vapor pressure - pressure loss in the suction piping - pressure loss due to the suction strainer.
Question Number 6: What is priming?
Answer: Pump casing must be filled with liquid before the pump is started, or the pump will not be able to function. If the pump casing becomes filled with vapors or gases, the pump impeller becomes gas-bound and incapable of pumping.
Question Number 7: What is Hydrodynamic Cavitation’s?
Answer: Hydrodynamic cavitation describes the process of vaporization in a constrained channel at a specific velocity. Bubble generation and Bubble implosion which occurs in a flowing liquid as a result of a decrease and subsequent increase in pressure.

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