That is a horribly worded question..Edit: my conversion number (0.00108147453246) was based on a temp of 15C .. but even if you use the standard "rough conversion" of 1" = 1,000' ... the answer is, 2,200 .. Closer to the answers, but still not one of them.

Yes it is a horribly worded question. That's always been my "conversion" as well, 1"/1000'. I'm sure it varies with altitude and pressure at any given moment, but that's what I remember from ground school and A&P school as well. They must mean beginning from sea level, then 2.2" * 1000'=2200' which is a close as you'll ever set the kohlsman anyway, so why would we worry about 34 feet (2247-2213=34)?The only time I ever used that conversion anyway was when my grandpa wanted to know how big a pump it would take to lift water from the creek bed up to his house. We took a barometer down there and deduced that it was a lift of about 400'. ...so then he bought a pump that'd lift 800'. Same approach one should take with flying - leave a little room for error. :smile:Jim

Mornin' all.Looking at the questions again while steaming my kitchen last night everything went swimmingly once I'd found the conversion factors for feet / in Hg and feet / hPa. I think the assumption is 1006 feet of elevation for an inch of mercury, and 29.7 feet for one hectopascal (sorry to mix S. I. and imperial), but as has been implied above, the standard 1000 feet per inch rule of thumb doesn't work.Surely it's not an officially-sanctioned text book. Millibar as mbs, MBs and Mbs, and hectopascals as hpa. Also, question 6 seems to be incomplete.Might we know what publication the questions were taken from?Regards,D

Mornin' all.Looking at the questions again while steaming my kitchen last night everything went swimmingly once I'd found the conversion factors for feet / in Hg and feet / hPa. I think the assumption is 1006 feet of elevation for an inch of mercury, and 29.7 feet for one hectopascal (sorry to mix S. I. and imperial), but as has been implied above, the standard 1000 feet per inch rule of thumb doesn't work.Surely it's not an officially-sanctioned text book. Millibar as mbs, MBs and Mbs, and hectopascals as hpa. Also, question 6 seems to be incomplete.Might we know what publication the questions were taken from?Regards,D

My instructor has created questions of his own... He is best known for flying and Ground School For DGCA exams