wrong e4 Flashcards
You are checking a demand regulator and find that the pressure gauge slowly drops to zero when the cylinder is switched off. What could be the cause?
Select one:
a.
The air is cooling and contracting
b.
There is a leak in the supply hose
c.
The mouthpiece is holed
d.
The diaphragm in the demand valve (second stage) is perished
e.
The exhaust valve in the demand valve (second stage) has stuck open
There is a leak in the supply hose
You and your buddy are using a SCUBA system with half mask and communications. You notice your buddy is motionless, and the mouthpiece has been displaced. Your buddy is 3 to 4m meters from you. What should you do?
Select one:
a.
Inform topside of the situation and await instructions
b.
Swim over, take the necessary remedial action and tell the surface
c.
Swim over, assess the situation, inform topside & take remedial action
d.
Signal emergency on your lifeline and then swim over to give assistance
e.
Carry on with your task
Swim over, assess the situation, inform topside & take remedial action
Where on a demand regulator would you expect to find a HP seat?
Select one:
a.
In the contents guage
b.
In the pressure reducer (first stage)
c.
In the demand regulator (second stage)
d.
In the LP suit inflation hose
e.
In the LP buoyancy compensator hose
In the pressure reducer (first stage)
Which of the following is NOT a danger specifically associated with gas mixtures supplied in cylinders / quads from a major gas supply company?
Select one:
a.
Central Nervous System oxygen toxicity
b.
Pulmonary oxygen toxicity
c.
Hypoxia
d.
Carbon monoxide toxicity
e.
Convulsions
d. carbon monoxide toxicity
Which of the following parts of the ear are associated with balance?
Select one:
a.
Semi-circular canals
b.
Cochlea
c.
Tympanic membrane
d.
Otoliths
e.
Extoses
semi circular valves
Which of the following part of the ear is where sound is converted into nervous impulses?
Select one:
a.
The tympanic membrane
b.
The malleus
c.
The round window
d.
The cochlea
e.
The semi circular canals
The correct answer is: The cochlea
Approximately what speed does sound travel underwater?
Select one:
a.
Same speed as in air
b.
2 times faster than in air
c.
4.4 times faster than in air
d.
25 times faster than in Air
e.
35 times faster than in air
4.4 times faster
When filling bailout cylinders from a HP bank using the cascade method, you can maximise efficiency by?
Select one:
a.
Using the highest bank pressure to within the lowest cylinder pressure
b.
Always using the lowest bank pressure that will fill the highest cylinder pressure
c.
Connecting all of the bank cylinders together to act as one big cylinder
d.
Connecting all the cylinders together
e.
None of the above
LB to HC
Lowest bank to high cylinder
Diving information sheet 9 (issued by HSE) provides guidance on the interpretation of breathing air standards set out by BS EN 12021. Which of the following items has a maximum permitted level that varies according to the type of equipment being sampled?
Select one:
a.
Carbon Dioxide
b.
Carbon Monoxide
c.
Lubricant
d.
Water
e.
Oxygen
Water
Duplex compressors have the advantage that they?
Select one:
a.
Produce a higher pressure than the conventional compressors
b.
Pump on both strokes of the cycle
c.
Produce HP and LP air for use from the same outlet
d.
Are much cheaper than the conventional compressors
e.
Are much quieter than conventional compressors
pump on both stroeks of the cycle
If you wanted to send your tender the signal lower which of the following signals would you send?
Select one:
a.
2 bells
b.
3 bells
c.
4 bells
d.
5 bells
e.
Succession of 2 bells
3 bells
diver to tender. bring object up
2 bells
Despite your efforts to control your rate of breathing on a hard working SCUBA dive, you notice an increasing headache. What is the most likely explanation for this?
Select one:
a.
Impending nitrogen narcosis
b.
Acute Decompression Illness
c.
Hypercapnia caused by inadequate lung ventilation
d.
Acute carbon monoxide poisoning
e.
You were diving with a cold
c. hypercapnua??
In addition to the flag alpha, what shapes could a diving vessel display during daylight hours if she is restricted in her ability to manoeuvre?
Select one:
a.
A diamond / circle / diamond displayed vertically
b.
A diamond / circle / diamond displayed horizontally
c.
A circle / diamond / circle displayed vertically
d.
A cone / circle / cone displayed horizontally
e.
Two big black balls
circle, diamond , circle
From a position on board the boat, starboard is defined as?
Select one:
a.
The right hand side of the boat when facing the bow
b.
The right hand side of the boat when facing the stern
c.
The left hand side when facing the bow
d.
The front of the boat
e.
The rear of the boat
right hand side when facign the bow
Carbon Monoxide is a dangerous gas because?
Select one:
a.
It decreases oxygenation of the tissues
b.
It increases the risk of acute decompression illness
c.
It is a serious fire hazard
d.
Both A & C
e.
None of the above
reduces oxygenation fo the tissues
Duplex compressors have the advantage that they?
Select one:
a.
Produce a higher pressure than the conventional compressors
b.
Pump on both strokes of the cycle
c.
Produce HP and LP air for use from the same outlet
d.
Are much cheaper than the conventional compressors
e.
Are much quieter than conventional compressors
pump on both strokes
What will 12 cubic meters volume of air reduce to at 50m depth?
Select one:
a.
0.95 litres
b.
2.0 litres
c.
2 cubic meters
d.
4 cubic meters
e.
20 litres
Feedback
Your answer is incorrect.
The correct answer is: 2 cubic meters
2 cubic meters
If diving is required in the high pressure area in the vicinity of lock gates, you would minimise the risk by?
Select one:
a.
Checking the low pressure side first for any signs of leaks
b.
Entering the water as close as possible to the lock gates
c.
Ensuring that the sluice valves are open
d.
Equalising the levels in the lock to remove the danger
e.
Using a second tender
What would be the best way of checking to see if a buoyancy compensator is leaking?
a.
Take it for a dive and see where the air is leaking.
b.
Dismantle the buoyancy compensator and look at the bladder.
c.
Immerse it in a bath of water and inflate it.
d.
Inflate it and leave for a couple of minutes to see if it deflates.
e.
Spray it with disinfectant liquid and then inflate it.
bath of water
A commercial diver may signal he/she is OK by using which of the following hand signals?
a.
Thumbs down.
b.
Thumbs up.
c.
A clenched fist at shoulder level.
d.
Putting their hand on their head.
e.
Waving one arm slowly.
thumbs up
Which of the following contaminants produced by a diving air compressor is likely to be the most hazardous to divers?
a.
Carbon dioxide.
b.
Oxygen hydride.
c.
Methane.
d.
Carbon monoxide.
e.
Sarin.
Feedback
Your answer is incorrect.
The correct answer is:
Carbon monoxide.
co
In which of the following descents is the pressure change the greatest?
a.
0-10m.
b.
10-40m.
c.
30-50m.
d.
10-20m.
e.
0-5m.
Feedback
Your answer is incorrect.
The correct answer is:
10-40m.
read the question!!
10-40m
An excess of carbon dioxide can lead to a disorder called:
a.
hypochondria.
b.
astrophobia.
c.
hyperoxic crisis.
d.
hypercapnia.
e.
narcosis.
hypercapnia
With hard wired simplex (single wire) communication systems, when topside is talking to the diver:
a.
the diver’s breathing can be heard on surface.
b.
the supervisor can hear the diver in their headset.
c.
the supervisor has to switch on the ancilliary speaker.
d.
no-one can monitor the divers breathing.
e.
topside can hear all divers on that circuit.
no-one can hear the divers breathing - READ THE ANSWERSRRSRSRR S
