Question 1
A saturation chamber is being held at a storage depth of 231 fsw. What is the absolute pressure inside the chamber?
Show answer & explanation
Correct answer: D - 8.0 ATA
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A saturation chamber is being held at a storage depth of 231 fsw. What is the absolute pressure inside the chamber?
Correct answer: D - 8.0 ATA
An LST must blend a breathing gas that will deliver an oxygen partial pressure of 0.45 ata at a storage depth of 300 fsw. What oxygen fraction is required?
Correct answer: D - 4.46%
A helium quad is charged to 2,400 PSIG at 70°F and left on deck, where its temperature rises to 100°F. Assuming no gas is drawn off, the quad will read approximately:
Correct answer: C - 2,537 PSIG
A chamber CO2 analyser reads 0.05% actual at a storage depth of 300 fsw. Expressed as a surface equivalent value, this reading is:
Correct answer: D - 0.50% SEV
Which gas law explains why helium moves across a pressure gradient more rapidly than nitrogen at equivalent partial pressure?
Correct answer: B - Graham's Law, under which diffusion rate varies inversely with the square root of molecular weight
A diver reaches the surface and within four minutes presents with sudden unconsciousness and one-sided weakness. The most likely diagnosis is:
Correct answer: B - Arterial gas embolism, arising from pulmonary overinflation on ascent
Pulmonary oxygen toxicity, as distinct from central nervous system oxygen toxicity, is characterised by:
Correct answer: D - Cumulative exposure at moderate partial pressures, tracked in UPTD
During compression to a storage depth of 650 fsw on heliox, a diver reports tremors, dizziness and nausea. The LST should recognise this as:
Correct answer: A - High Pressure Nervous Syndrome, mitigated by slowing the compression rate
A diver surfaces reporting pain in the left shoulder. The pain is not relieved after 10 minutes at 60 fsw on oxygen. The indicated treatment table is:
Correct answer: C - Treatment Table 6, the standard schedule where pain is unrelieved at 60 fsw
Which oxygen partial pressure range represents the limits of safe diver exposure within a saturation chamber?
Correct answer: A - 0.16 to 1.25 ata
The full bank has 1,040 more LST questions with explanations.
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