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SDI Scuba Certification Exam Study Guide questions and answers.
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SDI Scuba Certification Exam StudyGuide
A properly weighted scuba diver should float at _____ when their BCD is deflated and lungs
are fully inflated. - correct answer-eye level
Cylinders should be visually inspected ____ a year and hydrostatically tested every ____
years - correct answer-once, five
Define maximum dive depth - correct answer-The deepest point reached during a dive
Define no-stop time - correct answer-The amount of time remaining at any point during a
dive before incurring a mandatory decompression stop.
Define risk management. - correct answer-a means of preventing problems and planning a
response to any emergency that may arise. Involves planning ahead, employing good diving
practices, and knowing what to do before an emergency arises.
Define SCUBA - correct answer-S - self
C - contained
U - underwater
B - breathing
A - apparatus
Describe 2 different ways to indicate "OK." - correct answer-at surface - both hands on top of
head or tap head with fist of one hand
underwater - pointer finger pressed to thumb (making a circle) and other three fingers
extended up
Describe 2 important features of a weight system. - correct answer-1) quick release
mechanism
2) evenly-dispersed lead
Describe 2 ways to clear a flooded second stage - correct answer-1) using purge button
2) exhaling into regulator
Describe all the steps to assemble a BCD and regulator to a scuba cylinder. - correct
answer-1) cylinder check - look for Visual Inspection sticker, remove valve cover and check
O-ring
2) BCD attachment - Spin the tank around so that the back of the valve is facing you. Place
the BCD band(s) over the top of the cylinder so that the back of the BCD is facing you. Raise
or lower the BCD so the top is even with the cylinder valve. Fasten the buckles. Check if
secure.
, 3) Regulator attachment - Remove dust cap, hold first stage in left hand, rotate the chambers
until the primary second stage sits on the right. Screw the knob on your first stage until it is
finger tight. Check if secure.
4) BCD inflator hose attachment - Connect the low pressure inflator hose to the stem on the
BCD's inflator. Check if secure.
5) Turn on air - holding the pressure gauge face down, slowly open valve counterclockwise.
Open all the way then back one rotation. Check SPG. Listen for hissing sound.
6) Regulator test - depress purge, smell air and taste test both second stages. Test inflator
hose.
7) Streamline hose check.
8) Have buddy double check.
Describe from start to finish the steps to disassemble your scuba system. - correct answer-1)
Remove accessories and weights
2) Decompress the system: Turn the valve knob completely clockwise. Decompress the
second stage using purge button and the auto inflator button to vent air remaining in the
hoses.
3) Detach the inflator hose from the inflator assembly. Unscrew the yoke knob until the first
stage can slip off the top of the valve. Dry dust cap and place on air inlet.
4) Undo the straps and remove the BCD up and off the cylinder.
5. Rinse off gear throughly. Make sure dust cap is on. Fill and drain BCD properly.
Describe how to perform a giant stride entry off a boat. - correct answer-Stand on the edge
of the dive platform, check the water below to make sure it is clear of other divers, put your
right hand over your mask and regulator and your left hand over your weight belt buckle,
stand straight, look directly ahead and take a big step out off the edge of the platform. Signal
OK if everything is alright and clear area as instructed.
Describe symptoms of decompression sickness (include mild and severe signs and
symptoms) - correct answer-Rash or crackling skin caused by nitrogen bubbles in skin
capillaries
joint pain caused by bubbles collecting in and around joints
difficulty breathing
loss of sensation (numbness)
unconsciousness
paralysis
Describe the 2 emergency out-of-air ascents. - correct answer-1) alternate air source ascent
- alert buddy you are out of air with appropriate signal. Buddy gives partner their octo
properly. Agree to ascend with right arms linked and left hand holding up inflator hose.
Ascend normally. The receiver of the octo must orally inflate BCD at surface.
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