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HeliTorque :: View topic - Q7 : Oxygen in the Atmosphere
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HeliTorque Forum Index » Ground School

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Q7 : Oxygen in the Atmosphere
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WhirlyGirl
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PostPosted: Thu Nov 10, 2005 6:20 pm    Post subject: Q7 : Oxygen in the Atmosphere Reply with quote

The amount of oxygen in the atmosphere remains the same up to an approximate height of:

a. 10 000 ft
b. 40 000 ft
c. 50 000 ft
d. 70 000 ft
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James T Lowe
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PostPosted: Thu Nov 10, 2005 6:48 pm    Post subject: Reply with quote

I'm not entirely sure I understand the question. I suspect this could be another one of those where there is no substitute for the reading and simply knowing what the question is getting at before attempting to answer!

My first instinct is A, but proportionally, that's not true, is it?

So how about D?
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PostPosted: Thu Nov 10, 2005 7:51 pm    Post subject: Reply with quote

James,

I think you ought to do your commercial pilot's licence Smile You would pass it Smile

CW
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PostPosted: Thu Nov 10, 2005 8:03 pm    Post subject: Reply with quote

Thank you Embarassed Smile

I don't think that my academic ability would be a problem Wink

The big stumbling block is where the money comes from.....
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PostPosted: Thu Nov 10, 2005 8:11 pm    Post subject: Reply with quote

TUC question.

A is the only answer that is vaguely relevant.
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PostPosted: Thu Nov 10, 2005 8:14 pm    Post subject: Reply with quote

What kind of dopey question is that??

The amount of oxygen in the atmosphere remains the same. End of story. Some gets used, some gets replaced.

Did they mean "The ratios of oxygen to other gases remains the same?" or else "There is enough oxygen to breathe reasonably comfortably, up to 10,000'..." or "Pilots are to use supplemental oxygen above what height?"

Who writes these questions?
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PostPosted: Thu Nov 10, 2005 8:20 pm    Post subject: Reply with quote

Quote:
What kind of dopey question is that??


Ans - "A JAR Question"
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blme
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PostPosted: Thu Nov 10, 2005 8:28 pm    Post subject: Exams Reply with quote

Hi All,

Daltons Law is the answer - 70,000 ft

We have to know this stuff to get a tick in a box, that's why it is important.

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PostPosted: Thu Nov 10, 2005 8:41 pm    Post subject: Reply with quote

Yup - I would have said D, only because you have to put an answer but the amount is always the same. As H-R says, 10,000' is the only relevant one in our (normal) working environs.

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PostPosted: Thu Nov 10, 2005 8:57 pm    Post subject: Reply with quote

The amounts of Oxygen and indeed the other gasses that make up our atmostphere remain constant up to 70,000 ft. It's not that there's less oxygen at 10,000ft, it's the pressure that affects how we can cope with breathing it in. The answer is D.

Quote:
The various gases that the atmosphere is made of consists of about 78% nitrogen, about 21% oxygen and about 1.1% carbon dioxide and other gases. These three main gases are very important to the body physiologically. Due to the constant mixing of winds and other meteorological factors, the percentages of each gas in the atmosphere are normally constant to about 70,000 ft. throughout a wide range of temperature and barometric changes.


There is a good article about it here:

http://www.mhoxygen.com/index.phtml?nav_id=26&article_id=3

WhirlyGirl Cool

P.S. I didn't write the question - it came out of the JARs practice papers.
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PostPosted: Thu Nov 10, 2005 9:06 pm    Post subject: Reply with quote

The influence of JAR is amazing - they can alter nature to make a full complement = 100.1%

Quote:
78% nitrogen,
21% oxygen and
1.1% carbon dioxide and other gases.


FF

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PostPosted: Thu Nov 10, 2005 9:10 pm    Post subject: Reply with quote

Well to be more precise...

Oxygen 20.94%
Nitrogen 78.08%
Carbon Dioxide 0.03%
Other Gasses 1%

Hmm, but this still adds up to 100.05%

Oh well Very Happy

WhirlyGirl Cool
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PostPosted: Thu Nov 10, 2005 9:25 pm    Post subject: Reply with quote

Perhaps the Big Guy on the cloud deferred to the superiority of JAR and allowed a LEETLE discrepancy and reduced it to 0.05% over!! Smile

FF

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PostPosted: Thu Nov 10, 2005 10:08 pm    Post subject: Reply with quote

Talk about giving it 110%.....
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