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ABSA 4B TEST EXAM (FULL TEST) || 2025
ACTUAL EXAM ALL QUESTIONS AND 100%
CORRECT ANSWERS GRADE A+|| LATEST AND
COMPLETE UPDATED VERSION 2025||
GUARANTEED PASS!!!
When preparing to start a steam boiler with a fully modulating firing rate control,
set the manual “automatic switch to and the flame control switch to the position.
Select one:
a. manual, low-fire
b. automatic, low-fire
c. manual, high-fire
d. manual, automatic ANSWER- a
A mechanical pump seal:
Select one:
a. Does not need cooling
b. can bedesigned for high pressure service
c. Will cause more wear on the shaft than a packing seal
d. Will have a substantial amount of leakage ANSWER- b
A gauge glass shows the level of a clear, colourless liquid as very dark, is the
gauge glass.
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Select one:
a. Flat
b. Tubular
c. Reflex
d. Bi-colour ANSWER- c
During the €œRinse€ stage when regenerating a sodium zeolite softener, the
solution going to the sewer contains:
Select one:
a. Calcium and magnesium ions
b. Sodium bicarbonates and sulphates
c. Sulphates and bicarbonates
d. Calcium sulphate ANSWER- a
In impulse turbine theory, the:
Select one:
a. Steam velocity increases through the rotating blades
b. Steam pressure decreases across the rotating blades
c. Steam pressure is reduced in the nozzles
d. Steam flow is reduced through the nozzles ANSWER- c
Refrigerants will evaporate when the:
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Select one:
a. Heat is removed from them
b. Temperature is reduced below saturation temperature
c. Temperature is increased to saturation temperature
d. Pressure is increased ANSWER- c
The set pressure of a safety valve may only be adjusted by: Select one:
a. an industrial insurance adjuster
b. the safety valve manufacturer, its authorized representative, or an assembler
c. authorized and certified personnel
d. a power engineer ANSWER- b
Sodium sulfite:
Select one:
a. Controls foaming
b. Prevents scale adhering to the tubes
c. Precipitates calcium and magnesium compounds
d. Prevents the corrosion caused by oxygen in boiler water - ANSWER
:d
Which of the following is NOT a way to maintain a positive pressure on a boiler
during a wet layup?
Select one:
a. use an oxygen scavenger.
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b. use a steam blanket.
c. use a head tank.
d. use a nitrogen blanket. ANSWER- a
Which of the following statement about constant air volume systems with
perimeter heating is FALSE?
Select one:
a. Excessive room cooling can occur with the 12.5°C air supply
b. The exterior wall convectors supplement the heat in the supplyair, which is
kept near 12.5°C
c. Interior zones may use reheat coils in the supply air ducts.
d. Constant air volume systems with perimeter heating are well suited for
larger buildings, due to the space available for the low velocityductwork.
ANSWER- d
Specific humidity is the: Select one:
a. Ratio of dry air to moisture
b. Percentage of moisture in the air
c. Actual moisture content of air expressed as kg of moisture per kg of dry air
d. Ratio of the actual amount of water vapour present in the air, to the amount
of water vapour the air can contain when it is saturated ANSWER- c
A knot used to pull at right angles to a pipe or pole is the: Select one:
a. Clove hitch
b. Bowline
ABSA 4B TEST EXAM (FULL TEST) || 2025
ACTUAL EXAM ALL QUESTIONS AND 100%
CORRECT ANSWERS GRADE A+|| LATEST AND
COMPLETE UPDATED VERSION 2025||
GUARANTEED PASS!!!
When preparing to start a steam boiler with a fully modulating firing rate control,
set the manual “automatic switch to and the flame control switch to the position.
Select one:
a. manual, low-fire
b. automatic, low-fire
c. manual, high-fire
d. manual, automatic ANSWER- a
A mechanical pump seal:
Select one:
a. Does not need cooling
b. can bedesigned for high pressure service
c. Will cause more wear on the shaft than a packing seal
d. Will have a substantial amount of leakage ANSWER- b
A gauge glass shows the level of a clear, colourless liquid as very dark, is the
gauge glass.
,2|Page
Select one:
a. Flat
b. Tubular
c. Reflex
d. Bi-colour ANSWER- c
During the €œRinse€ stage when regenerating a sodium zeolite softener, the
solution going to the sewer contains:
Select one:
a. Calcium and magnesium ions
b. Sodium bicarbonates and sulphates
c. Sulphates and bicarbonates
d. Calcium sulphate ANSWER- a
In impulse turbine theory, the:
Select one:
a. Steam velocity increases through the rotating blades
b. Steam pressure decreases across the rotating blades
c. Steam pressure is reduced in the nozzles
d. Steam flow is reduced through the nozzles ANSWER- c
Refrigerants will evaporate when the:
,3|Page
Select one:
a. Heat is removed from them
b. Temperature is reduced below saturation temperature
c. Temperature is increased to saturation temperature
d. Pressure is increased ANSWER- c
The set pressure of a safety valve may only be adjusted by: Select one:
a. an industrial insurance adjuster
b. the safety valve manufacturer, its authorized representative, or an assembler
c. authorized and certified personnel
d. a power engineer ANSWER- b
Sodium sulfite:
Select one:
a. Controls foaming
b. Prevents scale adhering to the tubes
c. Precipitates calcium and magnesium compounds
d. Prevents the corrosion caused by oxygen in boiler water - ANSWER
:d
Which of the following is NOT a way to maintain a positive pressure on a boiler
during a wet layup?
Select one:
a. use an oxygen scavenger.
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b. use a steam blanket.
c. use a head tank.
d. use a nitrogen blanket. ANSWER- a
Which of the following statement about constant air volume systems with
perimeter heating is FALSE?
Select one:
a. Excessive room cooling can occur with the 12.5°C air supply
b. The exterior wall convectors supplement the heat in the supplyair, which is
kept near 12.5°C
c. Interior zones may use reheat coils in the supply air ducts.
d. Constant air volume systems with perimeter heating are well suited for
larger buildings, due to the space available for the low velocityductwork.
ANSWER- d
Specific humidity is the: Select one:
a. Ratio of dry air to moisture
b. Percentage of moisture in the air
c. Actual moisture content of air expressed as kg of moisture per kg of dry air
d. Ratio of the actual amount of water vapour present in the air, to the amount
of water vapour the air can contain when it is saturated ANSWER- c
A knot used to pull at right angles to a pipe or pole is the: Select one:
a. Clove hitch
b. Bowline
