Which of the following is used for lifting a small quantity of water to a great height?
- AHydraulic crane
- BHydraulic ramCorrect
- CDraft tube
- DPenstock
Solution
Concept
Application of hydraulic ram
Formula
NONE
Step-by-step solution
1. A hydraulic ram uses the kinetic energy of a flowing water source to pump a fraction of the water to a much higher elevation. 2. It operates automatically using the water hammer principle without external power sources. 3. Thus, a hydraulic ram is used for lifting small quantities of water to great heights. Answer: B
Explanation
A hydraulic ram is a device that utilizes the kinetic energy and pressure surge of a large volume of falling water to lift a small portion of that water to a much greater height. It operates automatically without requiring external electricity or fuel. Therefore, option B is correct.
Why the other options are wrong
A) A hydraulic crane is used for lifting heavy loads, not water. C) A draft tube is used to recover kinetic energy at the outlet of a turbine. D) A penstock is a high-pressure pipe carrying water to a turbine.
Shortcut
Hydraulic ram uses water hammer shock waves to pump a small fraction of water to a high head without external power.
Common mistake
Confusing hydraulic ram with hydraulic cranes or mistaking penstocks/draft tubes for lifting devices.
Correct answer: B) Hydraulic ram