ANS:A - continuous

Cooling cum evaporation, also known as adiabatic cooling cum evaporation, refers to a process where cooling occurs simultaneously with evaporation, and the process is adiabatic, meaning there is no heat exchange with the surroundings. Here's how it works:

1. Cooling: The process involves the reduction of temperature, typically achieved by evaporating a liquid into a gas. As the liquid evaporates, it absorbs heat from its surroundings, leading to a decrease in temperature.
2. Evaporation: Evaporation is the process by which a liquid changes into its vapor phase. It occurs at the surface of the liquid and is influenced by factors such as temperature, humidity, and air flow.
3. Adiabatic Process: Adiabatic means that there is no heat exchange between the system and its surroundings. In the context of cooling cum evaporation, this means that the cooling and evaporation occur without any external heat input or removal.
4. Applications: Adiabatic cooling cum evaporation is utilized in various applications, such as:
   • Evaporative cooling systems, where water is sprayed or evaporated into the air to cool it down.
   • Humidification processes, where water is evaporated to increase the humidity of the air while simultaneously cooling it.
   • Cooling towers, where hot water is cooled through evaporation into the air.