1|Page
ABSA 4B EXAM 2025/2026; ACTUAL EXAM WITH
FREQUENTLY TESTED QUESTIONS & ANSWERS
Internal is not required for dynamic type compressors.
seals
lubricatio
n
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
lubricatio
n
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.
