ABSA 4B EXAM SCRIPT FULL QUESTIONS WITH EXPERT VERIFIED ANSWERS

ABSA 4B EXAM SCRIPT FULL QUESTIONS
WITH EXPERT VERIFIED ANSWERS

●● 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


●● 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


●● 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


●● 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


●● 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


●● 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


●● 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


●● 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


●● 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


●● 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