Applications of compressed air: Pneumatic systems commonly use compressed air to operate lifts, rams, and certain pumps (air lift and diaphragm types).

Introduction / Context:
Compressed air is a versatile power medium used in industrial automation and fluid handling. This question asks whether compressed air is indeed used to operate devices such as lifts, rams, and pumps.

Given Data / Assumptions:

• Pneumatic actuators (cylinders) convert air pressure into linear force for rams and lifts.
• Air lift pumps use compressed air injection to raise water via density reduction.
• Air driven diaphragm pumps use compressed air to flex diaphragms, moving liquids.

Concept / Approach:
Pneumatics relies on the pressure energy of compressed air. Control valves meter flow into actuators, generating motion or force. In pumping applications, compressed air either acts as the motive fluid (air lift) or powers a mechanical membrane that displaces liquid.

Step-by-Step Solution:

Verification / Alternative check:
Industrial catalogs and plant layouts routinely show pneumatic cylinders on lifts and rams, and air operated pumps in hazardous areas where electric motors are undesirable.

Why Other Options Are Wrong:
“No” contradicts widespread industrial practice. The restrictions in options “Only at very high pressure” or “Only under water” are not generally true; many systems operate at moderate plant air pressures.

Common Pitfalls:
Assuming hydraulics are the only option for heavy lifting. Pneumatics offer cleanliness and simplicity, though at lower force density compared to hydraulic systems.

Final Answer:
Yes