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 furnac...
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
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