ABSA 4b Exam Latest Version.

ABSA 4b Exam Latest Version. Warm Air Heating System Equipment In a warm air heating system the cold air return registers are located a) in exterior walls b) in interior locations c) under windows d) in floors e) in ceilings B The major disadvantage of an electric resistance coil furnace for warm air heating is a) the high cost of electricity b) the danger from electric shock c) the high cost of maintenance d) the large size of the furnace e) the location of electrical wiring A Lowboy furnaces are just over a) 1.0 m in height b) 0.8 m in height c) 1.4 m in height d) 1.6 m in height e) 1.2 m in height E The advantage of having duct furnaces instead of a large central furnace is a) less initial cost b) easier installation c) better control of heat in each zone of the building d) that they require less space e) lower maintenance costs C The power supply for an electric resistance coil furnace is a) 60 V b) 120 V c) 240 V d) 220 V e) 480 V C In a fin-coil heat exchanger the primary source of heat for the exchanger is a) steam or hot water b) gas c) oil d) solar e) radiant A A type of directly fired space heater is a) a unit heater b) a floor furnace c) a wall furnace d) all of the above e) none of the above D High efficiency furnaces and heaters range in annual fuel utilization efficiency (AFUE) from a) 94 - 98% b) 80 - 95% c) 70 - 75% d) 60 - 70% e) 50 - 60% B In high efficiency furnaces if the temperature of the flue gas drops below 65 degrees C the a) flue gas will condense b) water vapour will condense c) furnace burner will shut down d) furnace burner will start up e) furnace vent will close B In a pulse combination furnace the stated efficiency is a) 94 - 98% b) 80 - 95% c) 70 - 75% d) 60 - 70% e) 50 - 60% Warm Air Furnace Components and Maintenance A Heat exchangers in gas fired furnaces are made of a) brass b) copper c) aluminum d) steel e) cast iron D Air filters can be divided into two groups a) mechanical and rotating drum b) electronic and steam c) dry and wet d) steam and rotating drum e) mechanical and electronic E Electronic filters will remove a) all particles from the air b) fine particles from the air c) odour producing gases from the air d) smoke from the air e) all of the above B The perimeter loop system of furnace ducting is ideal for a building with a) no insulation in the walls b) concrete walls c) no basement d) low head room in the basement e) no cold air returns C Which of the following is a type of outlet in a warm air heating system? a) a grill b) a register c) a ceiling diffuser d) a perforated panel e) all of the above E Supply outlets should always be located a) in walls b) in floors c) in ceilings d) to best prevent cold drafts e) in baseboards D In a warm air heating system, the heated air should enter the rooms preferably via the a) high wall registers on the inside wall b) baseboard registers on the inside wall c) baseboard registers on the outside wall d) high wall registers on the outside wall e) unit heaters on the outside wall C Sleeve bearings on furnace fans require a) no lubrication b) grease every six months c) a few drops of oil every six months d) a few drops of oil monthly e) flood lubrication C Furnace heat exchangers should be checked for corrosion because a) carbon monoxide could leak into the building b) the holes reduce the furnace efficiency c) cold air could leak into the building d) too much air would enter the furnace e) the air will become too dry for comfortable heating A Insufficient heat throughout a building is likely caused by a) too high an air flow b) insufficient heat input c) poorly insulated ducting d) a missing filter e) poor humidity control B Rooms that are stuffy and dry are created by a) poor air distribution b) a low supply air temperature c) too much ventilation air d) poorly insulated ducts e) none of the above Ventilation and Air Filters E Actual ventilation rates may vary per person from a) 0.5 to 0.6 cubic metres/min b) 0.5 to 0.75 cubic metres/min c) 0.2 to 1.2 cubic metres/min d) 0.14 to 1.5 cubic metres/min e) 1.0 to 1.5 cubic metres/min D Ventilation can be divided into two basic methods: a) forced and natural b) mechanical and natural c) forced and mechanical d) natural and warmed air e) natural and cold air B Natural ventilation is improved by the use of a roof a) ventilator b) radiator c) grille d) louver e) panel A Mechanical ventilation can be divided into which types? a) natural air intake, natural exhaust b) mechanical air intake, natural exhaust c) natural air intake, mechanical exhaust d) natural intake, natural exhaust e) none of the above B In a mechanical air intake, natural exhaust ventilation system the pressure in the building is a) well below atmospheric pressure b) slightly below atmospheric pressure c) at atmospheric pressure d) slightly above atmospheric pressure e) well above atmospheric pressure D Living organisms that must be removed from the air are a) insects and pollen b) bacteria and insects c) bacteria and spores d) pollen and spores e) pollen and bacteria C Mechanical filters can be divided into two broad classes: a) wet and dry b) rotating and stationary c) dry and viscous d) corrugated and smooth e) throwaway and renewable E Viscous filters are highly efficient in the removal of a) fine dust, fumes, and smoke b) bacteria and spores c) cooking odours d) dust and pollen e) mists and fogs D Electrostatic filters are highly efficient in the removal of a) dust and pollen b) fine dust, smoke, and fumes c) bacteria and spores d) lint e) mists and fogs B Ultraviolet light is used to remove __________ from the air. a) dust and pollen b) fine dust and smoke c) bacteria and spores d) mists and fogs e) lint Infrared and Electric Heating C Infrared radiant energy is directed towards a) ceilings b) walls c) windows d) floors e) doors D Infrared heaters are usually mounted a) overhead b) on walls c) in floors d) under windows e) over doors A Gas-fired infrared heaters use the principle of a) heating a gas b) heating a solid surface c) heating a liquid d) heating a porous material e) all of the above B In an internally fired, gas fired infrared heater, the surface temperature is about a) 300 degrees C b) 400 degrees C c) 500 degrees C d) 600 degrees C e) 700 degrees C B A low temperature catalytic heater contains a layer of a) metal impregnated with a catalyst b) wool fibre impregnated with a catalyst c) plastic fibre impregnated with a catalyst d) glass wool impregnated with a catalyst e) porous glass impregnated with a catalyst D The quartz lamp heating element will respond a) instantaneously b) in a few seconds c) in about one minute