Hi Bob,

Just had a few of my friends sit HPL and was going over thier KDRs.
Wondering if you could help us answer a few questions they had.

Which part of the body will trapped gases have the least effect during an ascent ?
A) Middle Ear
Sinus
C) Small intestine
D) Teeth

(Chose middle ear and was wrong)

Which of the following gives the best visual acuity ?
A) 1 arc
1 min
C) 1 sec
D) 5 degree

(chose 5 degree and was wrong)

After scuba dying, which of the following are you most likely to suffer from decompression sickness?
A) unpressurized A/c
unpressurized at 8000ft
C) pressurized A/C
D) Cabin altitude of 10,000ft

I reckon D) because that would include both pressurised and unpressurised

Side effect of medication when taken for Gastrointestinal

Weird questions - where did you get them from?

First question. I would have to pick teeth. An aircraft on climb is moving into a constantly decreasing pressure environment. As the pressure differential between the trapped gasses and the outside environment increases, the trapped gasses expand and cause discomfort (barotrauma). Poor fillings in teeth could cause toothache but it would require a large and rapid onset of the pressure difference to have any noticeable effect.

Second question. Another strangely worded question. I would go for sec. Visual acuity is the ability to resolve small detail and it is limited by the angle subtended from the object's extremities to the retina. One second of arc is the smallest angle offered in the choices. One second of arc is one sixtieth of one degree.

Third question. Again the lowest pressure environment would be the answer. That makes a cabin altitude of 10000 feet the winner.

Fourth question. Nausea, vomiting, dyspepsia, abdominal cramps, diarrhea, or constipation. Take your pick!

Yes i know. Unusual questions, but they were the actual questions my friends had messed up in the cyber exam.

Thanks for your clarifications Bob.

Hi Bob,

I'm programmed in next week for this exam and just came across your explanation both in your training notes and in the forum. The answer you suggested to the 2nd question was 1 x sec as this is 1 x 60th of one degree. If there is 60 minutes in one degree, would it not be fare to say that 1 x 60th of 1 x degree is a minute?

I'm confused on tis this.

Regards:

Dobbo.

According to the one in sixty rule, one degree is one in sixty. One minute is one sixtieth of one degree so that is one in sixty times sixty, or 1 in 3,600.

Morning Bob,

I apologise for labouring this point but I'm revising again for my second sitting of this module and came across this issue again. In your first explanation to TheoPheonix101, above, you mention that one second of arc is one sixtieth of one degree and then in your explanation to me you mention that one minute is one sixtieth of one degree. I'm hoping you can clarify this for me again.

Cheers:

Dobbo.

I'm sorry that was a mistype. I should have said that one second of arc is one sixtieth of one minute, and one minute is one sixtieth of a degree. Therefore, one second of arc is one three thousand six hundredth of one degree. (that is one sixtieth of one sixtieth of one degree).

Sorry about the confusion - I had better improve my multi-tasking skills....

That's the answer I was hoping to hear!! Thanks for tidying that up for me. I was reluctant to question the teacher, but I just couldn't for the life of me work it out but now all has become very clear.

Thanks once again Bob.