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Centrifugal Pump Interview Questions 4 blog contains following questions

31. What is the largest part of a centrifugal pump?

32. Which part of a centrifugal pump prevents leakage?

33. Label the parts of the closed lubricating system.

34. Where do we use reciprocating pumps in our process system?

35. What should be the position of suction and discharge valves while starting a reciprocating pump?

36. Which part of the reciprocating pump actually moves liquid?

37. Reciprocating pumps can not increase the pumping capacity and it can pump only fixed quantity. Why?

38. What is a pump cavitation?

39. How Cavitation can be eliminated in a Pump?

40. Why the centrifugal pump is called high discharge pump?



31. What is the largest part of a centrifugal pump?

Pump casing is the largest part of a centrifugal pump.

32. Which part of a centrifugal pump prevents leakage?

Pump packing is used to prevent leakage from a pump.

33. Label the parts of the closed lubricating system.

Sight glass

Pump

Lube oil cooler

Temp. control valve TCV

Filter

PCV

Reservoir.

34. Where do we use reciprocating pumps in our process system?

Reciprocating pumps are commonly used in Chemical injection where we require high pressure pumping.

35. What should be the position of suction and discharge valves while starting a reciprocating pump?

Suction and discharge valves must be in full opened position and remove air / gas completely from the pump before starting a reciprocating pump.

36. Which part of the reciprocating pump actually moves liquid?

Piston and cylinder helps to move liquid in a reciprocating pump.

37. Reciprocating pumps can not increase the pumping capacity and it can pump only fixed quantity. Why?

Cylinders and pistons are designed to pump fixed quantity. So

Reciprocating pumps can not increase amount of flow.

38. What is a pump cavitation?

When there is no enough (low) suction head pressure, liquid, which is in the eye of the impeller, will move faster causing high temperature to produce vapor. 

This vapor lock will produce knocking sound to escape. This will cause pressure surging and loose the efficiency .It can damage the pump. This is called cavitation.

39. How Cavitation can be eliminated in a Pump?

Cavitation means bubbles are forming in the liquid.

· To avoid Cavitation, we have to increase the Pump size to One or Two Inch;

· To increase the pressure of the Suction Head, or

· Decrease the Pump Speed.

40. Why the centrifugal pump is called high discharge pump?

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. It is given in the following formulae:

Centrifugal force F= (M*V2)/R.

Where, M-Mass

V-Velocity

R-Radius

Thanks for reading - Centrifugal Pump Interview Questions 4
Naitik Patel
Industrial Guide

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