150Q ABSA 4B Practice Exam 2026 – Complete
Questions, Answers & Certification Prep Guide
In order to protect the driver, a start-stop air compressor should be equipped with:
A)
Safety heads
B)
An intercooler
C)
Manual cylinder bleed petcocks
D)
Pre-start automatic unloading
E)
An automatic blowdown system - correct answers -D)
Pre-start automatic unloading
1
,When the supply is above the pump the total static head of the pump will be the:
A)
Capacity of the pump
B)
Difference between the static suction head and the static discharge head
C)
Sum of the static suction head and the static discharge head
D)
Discharge pressure in metre
E)
Discharge head of the pump - correct answers -B)
Difference between the static suction head and the static discharge head
What kind of shaft seal would be most appropriate to use where some leakage is acceptable?
A)
2
,Mechanical
B)
Liquid Film
C)
Dry gas
D)
Carbon rings
E)
Labyrinth - correct answers -E)
Labyrinth
Sliding vane compressors:
A)
Use cylinder valves
B)
Are 100% efficient
3
, C)
Are double acting compressors
D)
Are positive displacement compressors
E)
Fall into the centrifugal compressor category - correct answers -D)
Are positive displacement compressors
Each hot water heating boiler shall be equipped with stop valves in the supply and return connections
to:
A)
Drain off the boiler without emptying the system
B)
To drain the boiler
C)
Prevent over pressure of the boiler
4
Questions, Answers & Certification Prep Guide
In order to protect the driver, a start-stop air compressor should be equipped with:
A)
Safety heads
B)
An intercooler
C)
Manual cylinder bleed petcocks
D)
Pre-start automatic unloading
E)
An automatic blowdown system - correct answers -D)
Pre-start automatic unloading
1
,When the supply is above the pump the total static head of the pump will be the:
A)
Capacity of the pump
B)
Difference between the static suction head and the static discharge head
C)
Sum of the static suction head and the static discharge head
D)
Discharge pressure in metre
E)
Discharge head of the pump - correct answers -B)
Difference between the static suction head and the static discharge head
What kind of shaft seal would be most appropriate to use where some leakage is acceptable?
A)
2
,Mechanical
B)
Liquid Film
C)
Dry gas
D)
Carbon rings
E)
Labyrinth - correct answers -E)
Labyrinth
Sliding vane compressors:
A)
Use cylinder valves
B)
Are 100% efficient
3
, C)
Are double acting compressors
D)
Are positive displacement compressors
E)
Fall into the centrifugal compressor category - correct answers -D)
Are positive displacement compressors
Each hot water heating boiler shall be equipped with stop valves in the supply and return connections
to:
A)
Drain off the boiler without emptying the system
B)
To drain the boiler
C)
Prevent over pressure of the boiler
4
