Question

Match List I with List II

List I (Pump) & List II (Pumps Characteristics)
A. Specific speed & I. Large discharge
B. Axial flow impellers & II. Small discharge
C. Radial flow impellers & III. Vapour filled cavities
D. Cavitation & IV. Dimensional analysis
E. Shape of head discharge curve & V. Performance curve

Choose the correct answer from the options given below:

• A. A - IV, B - I, C - II, D - III, E - V
• B. A - IV, B - II, C - I, D - III, E - V
• C. A - V, B - I, C - II, D - III, E - IV
• D. A - IV, B - I, C - II, D - V, E - III

Hint:

- Cavitation is always associated with vapor bubbles/cavities.
- Axial flow = high discharge, low head.
- Radial flow = low discharge, high head.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Hydraulic pumps are classified based on their impeller design and flow characteristics.
Parameters such as specific speed, head-discharge relationships, and operational issues like cavitation describe pump performance.
Detailed Explanation:
Let us match the concepts in List I with the characteristics in List II:
- A. Specific speed: A dimensionless parameter used to characterize turbomachinery, derived using principles of IV. Dimensional analysis.
- B. Axial flow impellers: These impellers propel water parallel to the shaft. They operate at high specific speeds and are designed to deliver a I. Large discharge against relatively low heads.
- C. Radial flow impellers: These impellers discharge fluid radially outward. They operate at lower specific speeds and are designed for a II. Small discharge against high heads.
- D. Cavitation: The formation and subsequent collapse of III. Vapour filled cavities (bubbles) within a liquid. This occurs when local static pressure drops below the vapor pressure of the liquid, causing erosion and damage to the impeller blades.
- E. Shape of head-discharge curve: Represents the relationship between operating head and discharge, which is a key component of a pump's overall V. Performance curve.
Mapping these matches gives: A - IV, B - I, C - II, D - III, E - V.

Step 2: Final Answer:
This sequence matches Option (A).