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At what psi is the safety valve set to open?

A 150 psi
In an air brake system, the first tank that receives compressed air has a safety valve that releases air if the pressure gets too high. It is usually set to open at 150 psi. If the valve must open, there is a fault in the system that should be repaired by a mechanic.
B 100 psi
C 200 psi
D 500 psi