Learn the four common transformer operating states: operating, hot standby, cold standby, and maintenance. Discover their characteristics, applications, safety requirements, and FAQs.

Learn the main functions of a transformer, including voltage transformation, electrical isolation, impedance matching, and current conversion. Discover how transformers improve power system efficiency and safety.

Learn the importance of BOD testing, how Biochemical Oxygen Demand is measured, its role in water quality assessment, wastewater treatment, pollution control, and environmental monitoring.

Learn the typical boiling point of coolant, how antifreeze works, the role of ethylene glycol, freezing point requirements, and FAQs about coolant performance and engine protection.