Millwright period 3 compressors
Questions with Complete Solutions
(Latest 2025)
What are the 2 main categories of screw compressor -
Correct Answers ✅Oil wet and oil free dry screw comp
Witch rotor is the driver on a screw compressor - Correct
Answers ✅The male rotor
What determines the capacity of a screw compressor -
Correct Answers ✅Rotor length, diameter, lobe flute
design and speed
What determines the discharge pressure of a screw
compressor - Correct Answers ✅The location of the inlet
port along the rotor, the length of path and the discharge
port location
What function does the oil in a wet screw compressor serve -
Correct Answers ✅Remove heat, seal gaps to prevent
leakage, lubricate and reduce noise
What is the simplest type of control system in a screw
compressor - Correct Answers ✅Online/offline control
Which control system allows the compressor to produce only
the amount of air required - Correct Answers ✅Modulation
control
, Millwright period 3 compressors
Questions with Complete Solutions
(Latest 2025)
What must be included to prevent rotor contact on a dry
screw compressor - Correct Answers ✅Timing gears need
to be used
Where are the thrust bearings located on a screw compressor
- Correct Answers ✅On the discharge side
Air filter should be able to remove particles down to what size
before air enters the compressor - Correct Answers ✅5
microns
What two functions do oil separators perform - Correct
Answers ✅Oil separation from air, acts as an oil reservoir
What two functions do the minimum pressure valve perform -
Correct Answers ✅Maintain a minimum air pressure in
separator, acts as a check valve preventing flow reversal
What is the function of the thermal mixing valve - Correct
Answers ✅To maintain a minimum oil injection temp
What is the advantage of the helical lobe blower vs the 2 lobe
blower - Correct Answers ✅Increases Pr and smother air
delivery
Questions with Complete Solutions
(Latest 2025)
What are the 2 main categories of screw compressor -
Correct Answers ✅Oil wet and oil free dry screw comp
Witch rotor is the driver on a screw compressor - Correct
Answers ✅The male rotor
What determines the capacity of a screw compressor -
Correct Answers ✅Rotor length, diameter, lobe flute
design and speed
What determines the discharge pressure of a screw
compressor - Correct Answers ✅The location of the inlet
port along the rotor, the length of path and the discharge
port location
What function does the oil in a wet screw compressor serve -
Correct Answers ✅Remove heat, seal gaps to prevent
leakage, lubricate and reduce noise
What is the simplest type of control system in a screw
compressor - Correct Answers ✅Online/offline control
Which control system allows the compressor to produce only
the amount of air required - Correct Answers ✅Modulation
control
, Millwright period 3 compressors
Questions with Complete Solutions
(Latest 2025)
What must be included to prevent rotor contact on a dry
screw compressor - Correct Answers ✅Timing gears need
to be used
Where are the thrust bearings located on a screw compressor
- Correct Answers ✅On the discharge side
Air filter should be able to remove particles down to what size
before air enters the compressor - Correct Answers ✅5
microns
What two functions do oil separators perform - Correct
Answers ✅Oil separation from air, acts as an oil reservoir
What two functions do the minimum pressure valve perform -
Correct Answers ✅Maintain a minimum air pressure in
separator, acts as a check valve preventing flow reversal
What is the function of the thermal mixing valve - Correct
Answers ✅To maintain a minimum oil injection temp
What is the advantage of the helical lobe blower vs the 2 lobe
blower - Correct Answers ✅Increases Pr and smother air
delivery
