Question

The operating pressure of raingun varies from

• A. 1-3 kg/cm$^2$
• B. 3-9 kg/cm$^2$
• C. 9-12 kg/cm$^2$
• D. 12-18 kg/cm$^2$

Hint:

Raingun systems are categorized as "high-pressure sprinkler systems."
They operate at 3 to 9 kg/cm$^2$ pressure and are highly suited for irrigating tall crops like sugarcane, maize, and orchards.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
A raingun is a high-capacity, high-pressure sprinkler system designed to irrigate large areas from a single nozzle.
Due to its large discharge and long radius of throw, it requires significant pressure to operate.
Detailed Explanation:
- Standard agricultural sprinklers operate at low-to-medium pressures, typically $1.5 \text{ to } 3.0 \text{ kg/cm}^2$.
- Rainguns, however, must throw water over distances of $20 \text{ to } 50 \text{ meters}$.
- To atomize the large water jet and achieve uniform coverage over such a wide radius, rainguns require an operating pressure ranging from ______3 to 9 kg/cm$^2$______ (or approximately $30 \text{ to } 90 \text{ meters}$ of water head).
- Operating pressures below $3 \text{ kg/cm}^2$ will result in a stream that does not break up, causing soil erosion and crop damage, while pressures above $9 \text{ kg/cm}^2$ are typically unnecessary and increase pumping costs.

Step 2: Final Answer:
The operating pressure of a raingun varies from 3 to 9 kg/cm$^2$, corresponding to option (B).