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An overview of various scuba diving equipment and techniques, covering topics such as the purpose of a snorkel, how to determine if a mask fits correctly, types of rescue signaling devices, fin designs, the differences between wet suits and dry suits, additional attire for warmth, functions of wet suit boots, features of a dive computer, weight systems, dive flags, the components of a scuba regulator, and the components of a compass. The document also includes information on the visual inspection and hydrostatic testing requirements for scuba cylinders, as well as the components that may be found in a dive console. This comprehensive guide is likely to be useful for both beginner and experienced scuba divers, as it covers a wide range of essential scuba diving knowledge and skills.
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SDI Chapter 3
What is the main purpose of a snorkel?correct answerIt's useful on long surface swims because it allows you to conserve air from your scuba cylinder. How do you know if a mask fits correctly?correct answerYou press it against your face and inhale through the nose, if it stays then you are good. Name at least one visual and one audible rescue signaling device.correct answerNarrow tube and whistle. Name two basic fin designs and describe the main features of each.correct answerFull foot and open- heel. Full foot fins are similar to a slipper and open-heel fins are necessary for colder dives. What is the main difference between a wet suit and a dry suit?correct answerA dry suit is used in colder temperatures and it keeps you dry. What extra attire can enhance a diver's warmth when worn with a wet or dry suit?correct answergloves Name two functions of wet suit boots.correct answerProtection against scrapes and warmth List four functions of a dive computer.correct answerMax depth, current depth, no deco time, and total dive time. Define maximum dive depth.correct answerThe deepest point during the dive. Define no-stop time.correct answerYou can safely ascend directly to the surface at any point during the dive.
What are two ways a PDC may alert a diver that he or she is ascending too fast?correct answerVisual and audible warnings. How do you determine the time limit for a repetitive dive from a PDC?correct answerElapsed time in minutes. What are the two main modes of operation of a dive computer?correct answerDecompression mode and log mode. What are two types of weight systems?correct answerthe weight belt, and the integrated weight BCD. What are the two types of dive flags that are commonly flown from a dive boat?correct answerThe diver down and the international alpha flag. Describe the function of a scuba regulator first stage and second stage.correct answerThe first stage attaches to the tank valve so it reduces the high-pressure air to an immediate pressure for breathing. The second stage gives air at ambient pressure directly to the diver. A cylinder should be visually inspected at least ------ a year and hydrostatically tested every ----- years in the US.correct answeronce, five List three components of a compass.correct answerCard, lubber line, and face. What does the abbreviation BCD stand for?correct answerBuoyancy Control Device State the gauges that a console might hold.correct answerHow much air is left in the tank, depth, and compass.