ABSA: 4th Class Part B - Comprehensive
Exam 3 UPDATED ACTUAL QUESTIONS
AND CORRECT ANSWERS
Which type of oil produces higher fluid friction?
Select one:
a. High viscosity oil
b. Low viscosity oil
c. Synthetic oils
d. Fixed oils - Correct answers✔✔a
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 - Correct answers✔✔d
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 - Correct answers✔✔a
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 - Correct answers✔✔a
Air compressor oil should:
Select one:
a. Have a very low viscosity
b. Have low carbon residue
c. Have a low flash point
d. Not contain anti-oxidants - Correct answers✔✔b
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 - Correct answers✔✔d
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 - Correct answers✔✔d
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 - Correct answers✔✔c
The purpose of a boiler boil out is to:
Select one:
a. clean the fireside surfaces.
, b. dry out the refractory.
c. determine the level at which the low water cut-off functions.
d. remove grease and oil from the heat transfer surfaces. - Correct answers✔✔d
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 - Correct answers✔✔a
_____ 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 - Correct answers✔✔d
When used on a boiler, modulating combustion control will:
Select one:
a. Change air and fuel flow proportionally to changes in steam pressure
Exam 3 UPDATED ACTUAL QUESTIONS
AND CORRECT ANSWERS
Which type of oil produces higher fluid friction?
Select one:
a. High viscosity oil
b. Low viscosity oil
c. Synthetic oils
d. Fixed oils - Correct answers✔✔a
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 - Correct answers✔✔d
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 - Correct answers✔✔a
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 - Correct answers✔✔a
Air compressor oil should:
Select one:
a. Have a very low viscosity
b. Have low carbon residue
c. Have a low flash point
d. Not contain anti-oxidants - Correct answers✔✔b
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 - Correct answers✔✔d
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 - Correct answers✔✔d
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 - Correct answers✔✔c
The purpose of a boiler boil out is to:
Select one:
a. clean the fireside surfaces.
, b. dry out the refractory.
c. determine the level at which the low water cut-off functions.
d. remove grease and oil from the heat transfer surfaces. - Correct answers✔✔d
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 - Correct answers✔✔a
_____ 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 - Correct answers✔✔d
When used on a boiler, modulating combustion control will:
Select one:
a. Change air and fuel flow proportionally to changes in steam pressure
