Millwright Level 3 Pneumatics Exam
Questions and Answers 100% score
Latest update 2026
How does a regulator in a pneumatic system respond to a decrease
of downstream air pressure? -
correct answer ✅increases orfice size to increase air flow
Which type of directional control valve is an on-off valve in a
pneumatic system? -
correct answer ✅two-way valve
Where should the air intake be located? -
correct answer ✅in the coolest place possible
what is an air receivers purpose? -
correct answer ✅to compensate for fluctuations in demand, and
to dampen pulsations.
what things must every air receiver have? -
correct answer ✅Gauge, drain, and pressure relief valve
what must the pressure relief valve be set at? -
correct answer ✅must be no higher then the lowest maximum
pressure rating of any part in the system.
,Millwright Level 3 Pneumatics Exam
Questions and Answers 100% score
Latest update 2026
how should safety relief valves be mounted, and why? -
correct answer ✅vertically, usually on top, to prevent dirt and
sludge from blocking them.
what are the three types of commonly used pipe systems? -
correct answer ✅the grid(dead end) system, decentralized
system(unit system) and Loop system
what is the preferred or recommended piping system? -
correct answer ✅the loop system
Describe the Grid(dead end) system of piping. -
correct answer ✅its the simplest, only requires one compressor,
starts with a large diameter supply line that gradually decreases.
one drawback is that systems at the end of the circuit could face air
starvation when upstream demand is heavy.
Describe the decentralized system -
correct answer ✅composed of two or more compressors each
with their own grid. grids may or may not be interconnected.
, Millwright Level 3 Pneumatics Exam
Questions and Answers 100% score
Latest update 2026
advantage is each compressor is close to its point of use which
means there is less pressure drop and more uniform supply
pressure.
Describe the loop system of piping? -
correct answer ✅Two or more compressors feed into the same
loop allowing compressed air to flow in either direction. ensures
equal air distribution throughout the plant.
Flared fittings are not used where? -
correct answer ✅where vibration is present.
what normally open valve is installed on hoses to prevent whipping
in the event of fitting or hose failure? -
correct answer ✅excess flow valve
what are two methods of sealing a pneumatic DCV (Directional
control valves)? -
correct answer ✅packed bore - o-rings are fixed in grooves in the
body through which the spool slides.
Packed spool - o-rings are fixed in the spool.
Questions and Answers 100% score
Latest update 2026
How does a regulator in a pneumatic system respond to a decrease
of downstream air pressure? -
correct answer ✅increases orfice size to increase air flow
Which type of directional control valve is an on-off valve in a
pneumatic system? -
correct answer ✅two-way valve
Where should the air intake be located? -
correct answer ✅in the coolest place possible
what is an air receivers purpose? -
correct answer ✅to compensate for fluctuations in demand, and
to dampen pulsations.
what things must every air receiver have? -
correct answer ✅Gauge, drain, and pressure relief valve
what must the pressure relief valve be set at? -
correct answer ✅must be no higher then the lowest maximum
pressure rating of any part in the system.
,Millwright Level 3 Pneumatics Exam
Questions and Answers 100% score
Latest update 2026
how should safety relief valves be mounted, and why? -
correct answer ✅vertically, usually on top, to prevent dirt and
sludge from blocking them.
what are the three types of commonly used pipe systems? -
correct answer ✅the grid(dead end) system, decentralized
system(unit system) and Loop system
what is the preferred or recommended piping system? -
correct answer ✅the loop system
Describe the Grid(dead end) system of piping. -
correct answer ✅its the simplest, only requires one compressor,
starts with a large diameter supply line that gradually decreases.
one drawback is that systems at the end of the circuit could face air
starvation when upstream demand is heavy.
Describe the decentralized system -
correct answer ✅composed of two or more compressors each
with their own grid. grids may or may not be interconnected.
, Millwright Level 3 Pneumatics Exam
Questions and Answers 100% score
Latest update 2026
advantage is each compressor is close to its point of use which
means there is less pressure drop and more uniform supply
pressure.
Describe the loop system of piping? -
correct answer ✅Two or more compressors feed into the same
loop allowing compressed air to flow in either direction. ensures
equal air distribution throughout the plant.
Flared fittings are not used where? -
correct answer ✅where vibration is present.
what normally open valve is installed on hoses to prevent whipping
in the event of fitting or hose failure? -
correct answer ✅excess flow valve
what are two methods of sealing a pneumatic DCV (Directional
control valves)? -
correct answer ✅packed bore - o-rings are fixed in grooves in the
body through which the spool slides.
Packed spool - o-rings are fixed in the spool.
