Absa 5Th Class

ABSA 5TH CLASS QUESTIONS WITH CORRECT VERIFIED ANSWERS | 100% PASS (A+ CERTIFIED) Where are the return openings located regarding air distribution systems? Answer Return air openings are located on inner walls. The minimum temperature of the water used in a hydrostatic test of a boiler cannot be less than what temperature? Answer 20 degrees Celsius Which of the following are causes of pressure explosions? 1. effects of corrosion 2. weak pilot flame 3. stressed material due to heating too quickly 4. insufficient purge 5. scale and sludge build-up Answer 1, 3, 5 Carbon, which is not combined with hydrogen, is referred to as: Answer Fixed Carbon Maximum static pressure in a fuel oil line is approximately: Answer 35 kPa Combustion of a fuel in a boiler furnace: Answer should be performed with a minimum of excess air What is a hydrostatic test? Answer A way in which pressure vessels can be tested for strength and leaks. How often do burner and fan motors which uses standard bearing normally require lubrication? Answer Yearly On a hot water boiler, the pressure differential between the operating pressure and the safety relief valve set pressure must be (at a minimum): 1. 25% of operating pressure 2. 125% of operating pressure 3. 69 kPa 4. 25% of the safety relief valve set pressure Answer 3, 4 In hot water boiler operation the maximum operating temperature should never exceed: Answer 121 degrees celsius A substance, which will absorb humidity inside a boiler during dry lay up is: Answer Activated alumina When draft is produced by natural means: Answer cooler air surrounding the boiler increases draft Coal is composed of the following combustible components: Answer Carbon, hydrogen, Sulphur Which of the following are causes of furnace explosions? 1. main fuel valve closed when the burner flame is lost 2. insufficient purge 3. burners lit from hot refractory 4. effects of corrosion 5. admission of fuel before ignition source Answer 3,4,5 Which grade of oil is the most popular for domestic and small commercial boilers? Answer Grade 2 The inclined manometer as compared to the U manometer is what? Answer More accurate. How can the draft through a natural draft furnace be increased? Answer Increase the temperature of the stack The main function of a gas burner is: Answer provision of O2 - fuel contact The minimum distance from furnace to oil storage tank is: Answer 2 feet