ABSA 4B EXAM SCRIPT Questions with Correct Answers (Grade
A+)
Question 1: 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
Answer: B
Question 2: 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
Answer: A
Question 3: 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
Answer: E
Question 4: 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
Answer: C
Page 1
,Question 5: 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
Answer: C
Question 6: 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
Answer: A
Question 7: 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
Answer: D
Question 8: 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%
Answer: B
Question 9: 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
Answer: B
Page 2
,Question 10: 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
Answer: A
Question 11: Heat exchangers in gas fired furnaces are made of
A. brass
B. copper
C. aluminum
D. steel
E. cast iron
Answer: D
Question 12: 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
Answer: E
Question 13: 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
Answer: B
Question 14: 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
Answer: C
Page 3
, Question 15: 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
Answer: E
Question 16: Supply outlets should always be located
A. in walls
B. in floors
C. in ceilings
D. to best prevent cold drafts
E. in baseboards
Answer: D
Question 17: 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
Answer: C
Question 18: 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
Answer: C
Question 19: 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
Answer: A
Page 4
A+)
Question 1: 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
Answer: B
Question 2: 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
Answer: A
Question 3: 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
Answer: E
Question 4: 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
Answer: C
Page 1
,Question 5: 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
Answer: C
Question 6: 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
Answer: A
Question 7: 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
Answer: D
Question 8: 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%
Answer: B
Question 9: 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
Answer: B
Page 2
,Question 10: 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
Answer: A
Question 11: Heat exchangers in gas fired furnaces are made of
A. brass
B. copper
C. aluminum
D. steel
E. cast iron
Answer: D
Question 12: 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
Answer: E
Question 13: 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
Answer: B
Question 14: 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
Answer: C
Page 3
, Question 15: 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
Answer: E
Question 16: Supply outlets should always be located
A. in walls
B. in floors
C. in ceilings
D. to best prevent cold drafts
E. in baseboards
Answer: D
Question 17: 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
Answer: C
Question 18: 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
Answer: C
Question 19: 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
Answer: A
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