1|Page
ABSA 4B EXAM 2025/2026; ACTUAL EXAM
WITH FREQUENTLY TESTED QUESTIONS &
ANSWERS
Internal ____ is not required for dynamic type compressors.
seals
lubrication
pressure monitoring
corrosion monitoring
temperature monitoring - correct-answer-b
Cavitation in pumps is when the pressure in the suction line to the pump drops
below the vapour pressure of the liquid. To reduce or eliminate the cavitation you
would?
Decrease the suction pressure
Increase the suction pressure
Purge the suction of the pump
Increase the discharge pressure
Decrease the discharge pressure - correct-answer-b
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Freon-12 (R-12) is ____.
corrosive on metals when contacts moisture
non-toxic
flammable
explosive when mixed with air
toxic - correct-answer-b
The design of the cone-shaped lip enables the ____ to pop open.
PSV
globe valve
check valve
butterfly valve
non-return valve - correct-answer-a
A try cock is a piece of equipment installed on a boiler to measure the ____.
pH
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flow rate
pressure
temperature
water level - correct-answer-e
____ is spent once it has absorbed airborne contaminants up to 20% its own
weight.
Membrane filters
Mechanical filters
Coagulant filters
Electrostatic filters
Activated carbon - correct-answer-e
Boundary lubrication can occur when:
Metal to metal surface contact is present
Limited lubricant supply
Intermittent lubricant supply
Equipment startup/shutdown
All of the above - correct-answer-e
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____ is the temperature to which air must be cooled for water droplets begin to
condense out of the air.
Ventilation
Dewpoint
Humidification
Frost
Infiltration - correct-answer-b
The salt solution has reached ____, at the point where the ratio of water and salt
no longer changes.
cloud point
floc point
pour point
equilibrium
superheat - correct-answer-d
The ____ of a refrigeration lubricant is the temperature at which waxy particles
solidify and separate out of the oil to give a cloudy appearance to the mixture.
ABSA 4B EXAM 2025/2026; ACTUAL EXAM
WITH FREQUENTLY TESTED QUESTIONS &
ANSWERS
Internal ____ is not required for dynamic type compressors.
seals
lubrication
pressure monitoring
corrosion monitoring
temperature monitoring - correct-answer-b
Cavitation in pumps is when the pressure in the suction line to the pump drops
below the vapour pressure of the liquid. To reduce or eliminate the cavitation you
would?
Decrease the suction pressure
Increase the suction pressure
Purge the suction of the pump
Increase the discharge pressure
Decrease the discharge pressure - correct-answer-b
,2|Page
Freon-12 (R-12) is ____.
corrosive on metals when contacts moisture
non-toxic
flammable
explosive when mixed with air
toxic - correct-answer-b
The design of the cone-shaped lip enables the ____ to pop open.
PSV
globe valve
check valve
butterfly valve
non-return valve - correct-answer-a
A try cock is a piece of equipment installed on a boiler to measure the ____.
pH
,3|Page
flow rate
pressure
temperature
water level - correct-answer-e
____ is spent once it has absorbed airborne contaminants up to 20% its own
weight.
Membrane filters
Mechanical filters
Coagulant filters
Electrostatic filters
Activated carbon - correct-answer-e
Boundary lubrication can occur when:
Metal to metal surface contact is present
Limited lubricant supply
Intermittent lubricant supply
Equipment startup/shutdown
All of the above - correct-answer-e
, 4|Page
____ is the temperature to which air must be cooled for water droplets begin to
condense out of the air.
Ventilation
Dewpoint
Humidification
Frost
Infiltration - correct-answer-b
The salt solution has reached ____, at the point where the ratio of water and salt
no longer changes.
cloud point
floc point
pour point
equilibrium
superheat - correct-answer-d
The ____ of a refrigeration lubricant is the temperature at which waxy particles
solidify and separate out of the oil to give a cloudy appearance to the mixture.
