ENRICHED AIR NITROX ACTUAL TEST
QUESTIONS WITH COMPLETE SOLUTION
PREMIUM REVIEW CONTENT
●● When using EANx, you should expect narcosis to be
Answer: Although enriched air has less nitrogen than air does, oxygen
has been shown to be about as narcotic as nitrogen. Therefore, you
should expect little difference between diving nitrox and air with respect
to narcosis.
●● The primary concern regarding enriched air nitrox and equipment is
high oxygen content.
Answer: The primary concern regarding nitrox is the high oxygen
content because some materials more readily burn, or even explode, in
the presence of oxygen.
●● The recommendations for using equipment, other than cylinders,
with enriched air with up to 40% oxygen, include that (choose all that
apply)
Answer: Generally, for all equipment except your cylinder you can use
regular scuba equipment with enriched air with up to 40% oxygen.
However, local laws, standards or practices may require special fittings
or cleanings; follow these if they apply. In any case, during servicing,
oxygen compatible lubricants, as well as other materials, are generally
recommended.
, ●● The potential hazards of improper enriched air filling procedures
include (choose all that apply)
Answer: The primary hazards are fire or explosion hazard due to high
oxygen content coming in contact with combustible substances, and
inaccuracies in the blend leading to uncertainty of what the final blend
is. Nothing about blending would affect the potential for narcosis, nor
likely affect the reliability of a scuba regulator.
●● The markings that, according to broadly accepted dive community
practices, you should have on a scuba cylinder used for enriched air
nitrox include (choose all that apply)
Answer: The minimum markings on an enriched air cylinder include all
the markings required of an air cylinder, plus a band around the cylinder
shoulder reading NITROX, ENRICHED AIR or the like. Yellow
cylinders should have a 10 centimetre/4 inch green band. Non yellow
cylinders should have a 15 centimetre/6 inch band. The top and bottom
of this band should be a yellow, 2.5 cm/1 in. band, with the center 10
cm/4 in of green. There should also be a sticker/decal indicating whether
or not the cylinder is oxygen service rated, and a tag or sticker with the
diver's name, the EANx blend, fill date and the maximum depth for
using the blend. Local laws or standards may also add or substitute
required markings. The blender's name, initials or the boat name may be
on the cylinder, but these are not considered required markings.
●● The maximum oxygen partial pressure is _____________ and
contingency partial pressure is ________________.
QUESTIONS WITH COMPLETE SOLUTION
PREMIUM REVIEW CONTENT
●● When using EANx, you should expect narcosis to be
Answer: Although enriched air has less nitrogen than air does, oxygen
has been shown to be about as narcotic as nitrogen. Therefore, you
should expect little difference between diving nitrox and air with respect
to narcosis.
●● The primary concern regarding enriched air nitrox and equipment is
high oxygen content.
Answer: The primary concern regarding nitrox is the high oxygen
content because some materials more readily burn, or even explode, in
the presence of oxygen.
●● The recommendations for using equipment, other than cylinders,
with enriched air with up to 40% oxygen, include that (choose all that
apply)
Answer: Generally, for all equipment except your cylinder you can use
regular scuba equipment with enriched air with up to 40% oxygen.
However, local laws, standards or practices may require special fittings
or cleanings; follow these if they apply. In any case, during servicing,
oxygen compatible lubricants, as well as other materials, are generally
recommended.
, ●● The potential hazards of improper enriched air filling procedures
include (choose all that apply)
Answer: The primary hazards are fire or explosion hazard due to high
oxygen content coming in contact with combustible substances, and
inaccuracies in the blend leading to uncertainty of what the final blend
is. Nothing about blending would affect the potential for narcosis, nor
likely affect the reliability of a scuba regulator.
●● The markings that, according to broadly accepted dive community
practices, you should have on a scuba cylinder used for enriched air
nitrox include (choose all that apply)
Answer: The minimum markings on an enriched air cylinder include all
the markings required of an air cylinder, plus a band around the cylinder
shoulder reading NITROX, ENRICHED AIR or the like. Yellow
cylinders should have a 10 centimetre/4 inch green band. Non yellow
cylinders should have a 15 centimetre/6 inch band. The top and bottom
of this band should be a yellow, 2.5 cm/1 in. band, with the center 10
cm/4 in of green. There should also be a sticker/decal indicating whether
or not the cylinder is oxygen service rated, and a tag or sticker with the
diver's name, the EANx blend, fill date and the maximum depth for
using the blend. Local laws or standards may also add or substitute
required markings. The blender's name, initials or the boat name may be
on the cylinder, but these are not considered required markings.
●● The maximum oxygen partial pressure is _____________ and
contingency partial pressure is ________________.
