Question

Hydraulic Ram is a water lifting device that uses the

• A. Dynamic pressure of water to lift water from low head to high head.
• B. Dynamic pressure of water to lift water from high head to low head.
• C. Static pressure of water to lift portion of water from high head to low head.
• D. Static pressure of water to lift portion of water from low head to high head.

Hint:

Remember: "Water hammer" is a dynamic pressure phenomenon. A hydram takes a large flow at a low head and delivers a small flow at a high head using only this kinetic energy.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
A hydraulic ram (hydram) is a self-powering pump that uses no external electricity or fuel.
It operates on the principle of the "water hammer" effect, converting kinetic energy from falling water into pressure energy to lift water.

Step 2: Detailed Explanation:
Let us analyze the operational mechanics of a hydraulic ram:
When a large volume of water flows down a drive pipe from a low-height source, it builds up significant velocity and momentum.
Inside the ram, this flow suddenly closes a waste valve, causing the water column to stop abruptly.
This sudden stoppage generates a high-pressure shockwave (known as the water hammer effect) due to the dynamic pressure of the moving water column.
This transient high-pressure force opens a delivery valve, forcing a small portion of the water into an air chamber and up a delivery pipe to a much higher elevation.
Thus, the device successfully uses the dynamic pressure of a large flow under a low head to lift a small portion of that water to a high head.
It does not rely on static pressure, and its primary purpose is to lift water to a higher head, making option (A) the correct description.

Step 3: Final Answer:
The hydraulic ram utilizes the dynamic pressure of flowing water to lift a portion of the water from a low head to a high head.
Hence, the correct option is (A).