21) Which tool is used to straighten the deformed fins of air cooled condenser?

22) Which refrigerant spreads the pungent odour if it leaks from ice plant system?

23) Which device ensures correct flow of chilled water supply in chiller AC plant?

24) Which safety control stops the compressor motor if there is leakage of refrigerant?

25) How the pH of water is checked for acidic or alkaline?