Dive Master NAUI | questions and answers | 2023/24 | with complete solution

Dive Master NAUI | questions and answers | 2023/24 | with complete solution What pressure will a scuba cylinder with a rated working pressure of 3000 psig (207 bar), be exposed to during a hydrostatic test? - 5000 psig (345 bar) Which principle represents one basis for the hydrostatic testing of scuba cylinders? - Permanent expansion If a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may require cleaning by a process called: - Tumbling Which of the following is considered proper care of a scuba cylinder? - Preventing moisture from entering the cylinder. Two cylinder valves in common use today are: - 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? - Y valve Which internal valve designs are available in the first stage of scuba regulators? - Piston; Diaphragm Which valve is unaffected by cylinder air pressure with regard to the force needed to operate the valve? - Balanced Which regulator second stage design uses air pressure rather than mechanical leverage to open the main valve? - 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? - 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. - high; low Which diving instrument incorporates a Bourdon tube mechanism? - Cylinder pressure gauges Two benefits derived from using an electronic dive computer are _____. - 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 _____. - Water has most likely entered the first stage An air compressor used for filling scuba cylinders operates by the principle of _____. - Boyle's Law Dry suits form a waterproof barrier, but require undergarments to be effective in cold water - True In order to make an informed decision on equipment purchase, you need to have a solid educational background concerning the _____ of diving equipment: - Types, Method of operation, Care and maintenance The distance between successive wave crests is defined as _____. - Wavelength The highest tides are called _____ tides, and the lowest tides are called _____ tides. - spring; neap Water rocking back and forth in a lake or a bay is defined as _____. - Seiching The effect of the moon on tidal action is about _____. - Twice the effect of the sun The type of breaking wave that produces the greatest force when breaking is the _____ breaker. - Plunging If the water conditions are reasonable to make a beach dive, all of the following procedures are suggested: - Having your buoyancy compensator partially inflated for slight positive buoyancy. Being fully equipped. Getting as close to the water's edge as possible after timing the sets and lulls to match your entry with the smallest waves. Entering the water as quickly as possible immediately after a wave breaks, getting beyond the surf zone quickly, before the next wave breaks. When waves break on shore and the backrush is funneled through a narrow opening, the condition is known as _____. - A rip current Currents in bodies of water are formed by _____. - Surface winds, The rotation of the earth, The influence of the sun and moon Water of equal temperature at all levels is most likely to be found in a lake during the _____. - Spring The horizontal boundary between waters of differing salinity is defined as a _____. - Halocline