Operations and Maintenance Interview Questions and Answers

Blow down rate in cooling tower is the rate at which water is discharged to prevent buildup of impurities and maintain water quality.

• Blow down rate is typically expressed as a percentage of the total flow rate through the cooling tower.

• It helps in controlling the concentration of dissolved solids in the water to prevent scaling and corrosion.

• Higher blow down rates can lead to increased water consumption and operating costs.

• Example: A cooling tower with a blow down rate of 5% ...read more

Boilers can be classified into different types based on their design, fuel source, and application.

• Fire-tube boilers: Water is inside the tubes and hot gases surround them. Example: Scotch marine boiler.

• Water-tube boilers: Water flows through tubes and hot gases surround them. Example: Babcock and Wilcox boiler.

• Electric boilers: Heat is generated using electricity. Example: Electric steam boiler.

• Condensing boilers: Extract heat from exhaust gases to preheat water. Example: Ga...read more