Q1: Air intake for an air compressor should be preferably taken from

ANS:D - an outside atmosphere at 10°C.

The air intake for an air compressor should preferably be taken from an outside atmosphere at 10°C. Here's why:

1. Cooling: Air compressors generate heat during operation, and the compression process itself increases the temperature of the air. Drawing in cooler air from the outside helps in cooling the compressor and maintaining optimal operating temperatures, which is essential for its efficiency and longevity.
2. Dust and Contaminants: Locations with cooling towers or open coal yards nearby may introduce dust, contaminants, or particulate matter into the air intake. These particles can damage the compressor components and reduce its efficiency. Therefore, it's preferable to avoid such sites for air intake.
3. Temperature Control: Drawing air from an air-conditioned room maintained at a temperature of 18°C might seem beneficial for temperature control, but it's not practical for large-scale air compressors due to the limited capacity and cost associated with air conditioning. Additionally, the air conditioning system may not be designed to handle the airflow requirements of the compressor.
4. Optimal Operating Conditions: Operating air compressors with cooler intake air from the outside atmosphere at 10°C helps in achieving optimal operating conditions, including better efficiency, lower energy consumption, and reduced wear and tear on compressor components.