ABSA 5th Class Questions and Answers Already Passed

Where are the return openings located regarding air distribution systems? 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? 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 purge5. scale and sludge build-up 1, 3, 5 Carbon, which is not combined with hydrogen, is referred to as: Fixed Carbon Maximum static pressure in a fuel oil line is approximately: 35 kPa Combustion of a fuel in a boiler furnace: should be performed with a minimum of excess air What is a hydrostatic test? 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? 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 3, 4 In hot water boiler operation the maximum operating temperature should never exceed: 121 degrees celsius A substance, which will absorb humidity inside a boiler during dry lay up is: Activated alumina When draft is produced by natural means: cooler air surrounding the boiler increases draft Coal is composed of the following combustible components: Carbon, hydrogen, SulphurWhich of the following are causes o