SCBA Manual Practice Test

What is the pressure corresponding to 33% of the tank?

900 psi 1800 psi 2700 psi 3600 psi

Correct Answer:

1800 psi

Explanation:

The key idea is that pressure in an SCBA cylinder scales with the amount of air left. If the cylinder’s full pressure is 5400 psi, then about one third of the air remaining corresponds to roughly 0.33 × 5400 ≈ 1782 psi, which is rounded to 1800 psi. So the pressure corresponding to 33% of the tank is about 1800 psi. The other numbers would represent much smaller or larger fractions of the full pressure, not near one third.

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