ABSA part B 2024 | 150 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS

ABSA part B 2024 | 150 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS Which of the following is an example of a loss of latent heat? Steam condenses Water evaporates Ice melts Refrigerant evaporates - Answer A Steam coils with long tube lengths: Are likely to freeze when the incoming air isextremely cold (say -35°C) Have the greatest freezing problems at temperatures approaching €"2°C. Cause overheating and poor set pointtracking during cold weather Are unlikely to freeze at any temperature. - Answer B If a new boiler is not boiled out correctly, the result may be: Refractory damage Excessive waterside corrosion Excessively high water circulation rates Foaming - Answer D In the event of a power failure, which of the following will likely require a manual restart when power is restored? small condensate return pumps large air compressors unit heater fans air dryers - Answer B One purpose of the small valve on top of the shell of most boilers, which is not required by code, is to: allow water into the boiler when the boiler is being drained or cooled preventing the formation of a vacuum. allow water to escape before the steam stop valve is opened during the warm-up period. allow air to escape from the boiler when the boiler is being filled with water. allow air into the boiler when the boiler is being filled with water. - Answer C The cheapest and most commonly used grease is: Potassium base Chlorine base Lime base Sulphate base - Answer C The purpose of shaft sealing on a pump is to: Keep air in the pump Keep the packing gland cool Reduce fluids from leaking along the pump shaft Prevent lubricating oil from leaving the pump - Answer C When _____________ leached away from cooling tower wood, it is less able to resist decay. sap is lignin is cellulose is natural extractives are - Answer D In a chemical pulping process, lignin is removed from chipped wood in the: Recovery boiler Blow tank Hogger Digester - Answer D For an alkaline boil out, a boiler is fired and maintained under steam pressure for about: 7 days 30 Days 48 hours 10 hours - Answer C Priming of a centrifugal pump refers to: Removal of liquid from the pump Filling the pump casing with liquid and removing the air Lifting the pump Closing the vent on the pump casing - Answer B To reduce air temperature between stages, ____________ are used. intercoolers