NAUI INSTRUCTOR PROFESSIONAL DIVE
INSTRUCTION PREP QUESTIONS AND
ACCURATE ANSWERS GRADED A+
●● Which principle represents one basis for the hydrostatic testing of
scuba cylinders?
Answer: permanent expansion
●● if a visual cylinder inspection reveals corrosion inside a scuba
cylinder, it may require cleaning by a process called
Answer: tumbling
●● which of the following is considered proper care of a scuba cylinder?
Answer: preventing moisture from entering the cylinder
●● two cylinder valves in common use today are
Answer: the k-valve and din valve
●● which valve is an example of a special scuba valve that is required
for certain types of specialty diving such as deep diving with a single
cylinder?
Answer: y valve
,●● which internal valve designs are available in the first stage of scuba
regulators?
Answer: piston; diaphragm
●● which valve is unaffected by cylinder air pressure with regard to the
force needed to operate the valve?
Answer: balanced
●● which regulator second stage design uses air pressure rather than
mechanical leverage to open the main valve?
Answer: pilot
●● in the event of a regulator first stage malfunction, which type of
valve design would be likely to eliminate air flow to the diver?
Answer: upstream
●● when considering a regulator for purchase or use, an important point
to remember is that certain regulators may not be capable of delivering
____ flow rates at ____ cylinder pressure during an air sharing
emergency
Answer: high; low
●● which diving instrument incorporates a Bourdon tube mechanism?
Answer: cylinder pressure gauges
, ●● two benefits derived from using an electronic dive computer are
Answer: accurate monitoring of ascent rate and, if executing a multi-
level diving profile, avoidance of the maximum time/depth penalty
●● green discoloration on the first stage of a scuba regulator indicates
Answer: water has most likely entered the first stage
●● an air compressor used for filling scuba cylinders operates by the
principle of
Answer: Boyle's Law
●● dry suits form a waterproof barrier, but require undergarments to be
effective in cold water
Answer: true
●● in order to make an informed decision on equipment purchase, you
need to have a solid educational background concerning the ____ of
diving equipment
Answer: types, method of operation, care and maintenance
●● the distance between successive wave crests is defined as
Answer: wavelength
INSTRUCTION PREP QUESTIONS AND
ACCURATE ANSWERS GRADED A+
●● Which principle represents one basis for the hydrostatic testing of
scuba cylinders?
Answer: permanent expansion
●● if a visual cylinder inspection reveals corrosion inside a scuba
cylinder, it may require cleaning by a process called
Answer: tumbling
●● which of the following is considered proper care of a scuba cylinder?
Answer: preventing moisture from entering the cylinder
●● two cylinder valves in common use today are
Answer: the k-valve and din valve
●● which valve is an example of a special scuba valve that is required
for certain types of specialty diving such as deep diving with a single
cylinder?
Answer: y valve
,●● which internal valve designs are available in the first stage of scuba
regulators?
Answer: piston; diaphragm
●● which valve is unaffected by cylinder air pressure with regard to the
force needed to operate the valve?
Answer: balanced
●● which regulator second stage design uses air pressure rather than
mechanical leverage to open the main valve?
Answer: pilot
●● in the event of a regulator first stage malfunction, which type of
valve design would be likely to eliminate air flow to the diver?
Answer: upstream
●● when considering a regulator for purchase or use, an important point
to remember is that certain regulators may not be capable of delivering
____ flow rates at ____ cylinder pressure during an air sharing
emergency
Answer: high; low
●● which diving instrument incorporates a Bourdon tube mechanism?
Answer: cylinder pressure gauges
, ●● two benefits derived from using an electronic dive computer are
Answer: accurate monitoring of ascent rate and, if executing a multi-
level diving profile, avoidance of the maximum time/depth penalty
●● green discoloration on the first stage of a scuba regulator indicates
Answer: water has most likely entered the first stage
●● an air compressor used for filling scuba cylinders operates by the
principle of
Answer: Boyle's Law
●● dry suits form a waterproof barrier, but require undergarments to be
effective in cold water
Answer: true
●● in order to make an informed decision on equipment purchase, you
need to have a solid educational background concerning the ____ of
diving equipment
Answer: types, method of operation, care and maintenance
●● the distance between successive wave crests is defined as
Answer: wavelength
