The air governor should cut out between which pressure range?

The air governor should cut out between which pressure range?

• A. 100 to 110 psi
• B. 140 to 150 psi
• C. 110 to 120 psi
• D. 120 to 130 psi

Answer: (D)

Air pressure in the system is kept within a safe band by an air governor that turns the compressor on and off. The cut-out point is the upper limit at which the governor stops adding air to avoid over-pressurizing. This upper limit is chosen to provide enough pressure for braking and other pneumatic functions while staying within safe limits. For many diesel systems, the cut-out sits around 120 to 130 psi, so 120–130 psi is the appropriate range. If pressure climbs higher, the compressor won’t run until it drops back into the lower part of the band; if it stays too low, the compressor would keep cycling and the system wouldn’t have enough pressure for operation.

Air pressure in the system is kept within a safe band by an air governor that turns the compressor on and off. The cut-out point is the upper limit at which the governor stops adding air to avoid over-pressurizing. This upper limit is chosen to provide enough pressure for braking and other pneumatic functions while staying within safe limits. For many diesel systems, the cut-out sits around 120 to 130 psi, so 120–130 psi is the appropriate range. If pressure climbs higher, the compressor won’t run until it drops back into the lower part of the band; if it stays too low, the compressor would keep cycling and the system wouldn’t have enough pressure for operation.