ABSA: 4th Class Part B - Comprehensive Exam 3 QUESTIONS AND
DETAILED ANSWERS
1. Which type of oil produces higher fluid friction?
Select one:
a. High viscosity oil
b. Low viscosity oil
c. Synthetic oils
d. Fixed oils: a
2. A counter-flow cooling tower than a crossflow cooling tower.
Select one:
a. requires less fan power
b. has a lower pressure drop
c. is shorter
d. requires less floor space: d
3. Which of the following are chemicals used for boiler cleaning and treatment,
that require careful control and vigilant monitoring?
Select one:
a. Chelants
b. Phosphates
c. Sulfites
d. Sulfates: a
4. A hot water system which circulates water through the pipes with a pump is
known as a:
Select one:
a. Forced circulation system
b. Circulating system
c. Upfeed system
d. Closed system: a
5. Air compressor oil should:
Select one:
, ABSA: 4th Class Part B - Comprehensive Exam 3 QUESTIONS AND
DETAILED ANSWERS
a. Have a very low viscosity
b. Have low carbon residue
c. Have a low flash point
d. Not contain anti-oxidants: b
6. Although boilers have many different ignition systems, they all follow the
same sequence of steps. Which of the following is the first step?
Select one:
a. Run period
b. Main burner ignition
c. Pilot ignition
d. Pre-purge: d
7. Most municipal water distribution systems operate at pressures between:
Select one:
a. 590 and 602 kPa
b. 490 and 690 kPa
c. 250 and 350 kPa
d. 350 and 490 kPa: d
8. In newer steam heating systems, the condensate discharged by the steam
traps drains by gravity through the return piping to:
Select one:
a. A deaerator
b. A combination feeder/cut-off control.
c. A condensate tank
d. The boiler: c
9. The purpose of a boiler boil out is to:
Select one:
a. clean the fireside surfaces.
b. dry out the refractory.
, ABSA: 4th Class Part B - Comprehensive Exam 3 QUESTIONS AND
DETAILED ANSWERS
c. determine the level at which the low water cut-off functions.
d. remove grease and oil from the heat transfer surfaces.: d
10. A high water level in a boiler:
Select one:
a. May cause water carryover into the header
b. Will necessitate an immediate shutdown and cool down
c. Is usually caused by a boiler feed pump malfunction
d. Will cause the high water cut-off to shut down the boiler: a
11. are installed to prevent hot oil from spreading beyond the confines of
a hot oil heater in the event of a ruptured tube.
Select one:
a. By-pass pipes
b. Ditches
c. Tunnels
d. Dikes: d
12. When used on a boiler, modulating combustion control will:
Select one:
a. Change air and fuel flow proportionally to changes in steam pressure
b. Always be at set point when demand is at 50%
c. Alter only the air flow if a selector station is on manual
d. Respond to changes in atmospheric pressure: a
13. In order to avoid unstable burner operation in the event of high or low fuel
gas pressure, hot oil heaters are equipped with:
Select one:
a. Fuel gas surge vessels
b. High and low fuel gas pressure cut-offs
c. A high stack temperature switch
d. An emergency shutdown device: b
, ABSA: 4th Class Part B - Comprehensive Exam 3 QUESTIONS AND
DETAILED ANSWERS
14. In a fin-coil heat exchanger, the heat exchanger is
Select one:
a. Oil-fired
b. Direct-fired
c. a steam or hot water coil
d. Gas-fired: c
15. The cooling water for an air compressor should be turned on:
Select one:
a. Before starting the compressor
b. When the operating pressure is reached
c. After starting the compressor
d. When the compressor reaches operating temperature: a
16. dampers are controlled in such a way that they are either fully
open or fully closed.
Select one:
a. Relief
b. Backdraft
c. Return air
d. Two-position: d
17. When Teflon is used as part of the mechanical seal, the maximum tempera-
ture of oil that can be pumped by a hot oil pump is:
Select one:
a. 200°C
b. 150°C
c. 100°C
d. 250°C: a
18. Short radius elbows should be provided with
Select one:
DETAILED ANSWERS
1. Which type of oil produces higher fluid friction?
Select one:
a. High viscosity oil
b. Low viscosity oil
c. Synthetic oils
d. Fixed oils: a
2. A counter-flow cooling tower than a crossflow cooling tower.
Select one:
a. requires less fan power
b. has a lower pressure drop
c. is shorter
d. requires less floor space: d
3. Which of the following are chemicals used for boiler cleaning and treatment,
that require careful control and vigilant monitoring?
Select one:
a. Chelants
b. Phosphates
c. Sulfites
d. Sulfates: a
4. A hot water system which circulates water through the pipes with a pump is
known as a:
Select one:
a. Forced circulation system
b. Circulating system
c. Upfeed system
d. Closed system: a
5. Air compressor oil should:
Select one:
, ABSA: 4th Class Part B - Comprehensive Exam 3 QUESTIONS AND
DETAILED ANSWERS
a. Have a very low viscosity
b. Have low carbon residue
c. Have a low flash point
d. Not contain anti-oxidants: b
6. Although boilers have many different ignition systems, they all follow the
same sequence of steps. Which of the following is the first step?
Select one:
a. Run period
b. Main burner ignition
c. Pilot ignition
d. Pre-purge: d
7. Most municipal water distribution systems operate at pressures between:
Select one:
a. 590 and 602 kPa
b. 490 and 690 kPa
c. 250 and 350 kPa
d. 350 and 490 kPa: d
8. In newer steam heating systems, the condensate discharged by the steam
traps drains by gravity through the return piping to:
Select one:
a. A deaerator
b. A combination feeder/cut-off control.
c. A condensate tank
d. The boiler: c
9. The purpose of a boiler boil out is to:
Select one:
a. clean the fireside surfaces.
b. dry out the refractory.
, ABSA: 4th Class Part B - Comprehensive Exam 3 QUESTIONS AND
DETAILED ANSWERS
c. determine the level at which the low water cut-off functions.
d. remove grease and oil from the heat transfer surfaces.: d
10. A high water level in a boiler:
Select one:
a. May cause water carryover into the header
b. Will necessitate an immediate shutdown and cool down
c. Is usually caused by a boiler feed pump malfunction
d. Will cause the high water cut-off to shut down the boiler: a
11. are installed to prevent hot oil from spreading beyond the confines of
a hot oil heater in the event of a ruptured tube.
Select one:
a. By-pass pipes
b. Ditches
c. Tunnels
d. Dikes: d
12. When used on a boiler, modulating combustion control will:
Select one:
a. Change air and fuel flow proportionally to changes in steam pressure
b. Always be at set point when demand is at 50%
c. Alter only the air flow if a selector station is on manual
d. Respond to changes in atmospheric pressure: a
13. In order to avoid unstable burner operation in the event of high or low fuel
gas pressure, hot oil heaters are equipped with:
Select one:
a. Fuel gas surge vessels
b. High and low fuel gas pressure cut-offs
c. A high stack temperature switch
d. An emergency shutdown device: b
, ABSA: 4th Class Part B - Comprehensive Exam 3 QUESTIONS AND
DETAILED ANSWERS
14. In a fin-coil heat exchanger, the heat exchanger is
Select one:
a. Oil-fired
b. Direct-fired
c. a steam or hot water coil
d. Gas-fired: c
15. The cooling water for an air compressor should be turned on:
Select one:
a. Before starting the compressor
b. When the operating pressure is reached
c. After starting the compressor
d. When the compressor reaches operating temperature: a
16. dampers are controlled in such a way that they are either fully
open or fully closed.
Select one:
a. Relief
b. Backdraft
c. Return air
d. Two-position: d
17. When Teflon is used as part of the mechanical seal, the maximum tempera-
ture of oil that can be pumped by a hot oil pump is:
Select one:
a. 200°C
b. 150°C
c. 100°C
d. 250°C: a
18. Short radius elbows should be provided with
Select one:
