The minimum O2 for 3 crew is 1110 PSI. Which number is closest to this value?

The minimum O2 for 3 crew is 1110 PSI. Which number is closest to this value?

• A. 1000 PSI
• B. 1110 PSI
• C. 1200 PSI
• D. 1300 PSI

Answer: (B)

Understanding how to compare pressure values to a required minimum helps you pick the right setting. The minimum oxygen for three crew is 1110 PSI, so you look for the option that matches that value exactly. The 1110 PSI option is an exact match, making it the closest. The other options are 1000 PSI (110 PSI lower), 1200 PSI (90 PSI higher), and 1300 PSI (190 PSI higher), all farther from the required minimum. Therefore, the exact 1110 PSI option is the correct pick.

Understanding how to compare pressure values to a required minimum helps you pick the right setting. The minimum oxygen for three crew is 1110 PSI, so you look for the option that matches that value exactly. The 1110 PSI option is an exact match, making it the closest. The other options are 1000 PSI (110 PSI lower), 1200 PSI (90 PSI higher), and 1300 PSI (190 PSI higher), all farther from the required minimum. Therefore, the exact 1110 PSI option is the correct pick.