Matching Pump Concepts: LIST-I and LIST-II

This question requires matching key terms related to pump operation (LIST-I) with their correct definitions or phenomena (LIST-II).

Understanding Term A: Impeller

The Impeller is a crucial component in pumps responsible for transferring rotational energy from a motor to the fluid. This energy transfer causes the fluid to move.

• Correct Match: II. Energy is provided to fluid via rotation.

Understanding Term B: Cavitation

Cavitation occurs when the pressure within the fluid drops below its vapour pressure, leading to the formation of vapour bubbles. The subsequent collapse of these bubbles generates shockwaves, causing damage and noise.

• Correct Match: III. Vapour bubble collapse and formation.

Understanding Term C: Priming (PRIMING)

Priming is a necessary procedure for certain types of pumps, especially before the initial start or after maintenance. It involves filling the pump casing and suction line with the fluid being pumped, typically by removing any trapped air.

• Correct Match: IV. Clearing suction line of air before start.

Understanding Term D: Dead Zone

A Dead Zone in fluid dynamics typically refers to a region within a flow system where the fluid velocity is very low or negligible, leading to poor circulation or stagnant conditions.

• Correct Match: I. Fluid motion occurring poorly.

Final Correct Matching

Based on the analysis of each term:

• A matches with II
• B matches with III
• C matches with IV
• D matches with I

Therefore, the correct combination is A-II, B-III, C-IV, D-I.