What is the main purpose of a snorkel?
It's used when a long swim on the surface is required in order to conserve air in the tanks.
How do you know if a mask fits correctly?
1. Press the mask against your face without using the strap 2. Make sure there's no hair under the skirt of the mask 3. Inhale slightly 4. If the mask tightens against your face and doesn't fall off it's a good fit.
Name at least 1 visual and 1 audible rescue signaling device.
1. Whistles 2. Horns 3. Inflatable Tube 4. Inflatable Lift Bag
Name 2 basic fin designs and describe the main features of each.
1. Open Heel - Necessary when diving in cold water to enable the diver to wear neoprene boots. Also adjustable sizes are available. 2. Full Foot - Must be exact fit. But, allow more efficient use of leg muscles.
What is the main difference between a wet suit and a dry suit?
1. Wet suit keeps a diver warm by trapping a small layer of water between the suit and the diver's skin. 2. Dry suit keeps a diver warm by trapping dry air between the skin and the suit. Dry suits are typically more buoyant. But they're also much warmer.
What extra attire can enhance a divers warmth when worn with a wet suit or a dry suit?
1. Neoprene boots 2. Gloves 3. Hoods.
Name 2 functions of wet boots
1. Protection against abrasions 2. Warmth
List 4 functions of a dive computer.
1. No Decompression Limit 2. Current Depth 3. Max Depth 4. Dive Time 5. Ascent Rate 6. Required Decompression 7. Surface Interval Time 8. Time to Fly 9. Logbook 10. Bottom Time
Define Maximum Dive Depth.
The deepest point reached during a dive
Define No-Stop Time or No-Stop Dive.
A dive during which you can safely ascend straight to the surface with no decompression stops.
What are 2 ways a PDC may alert a diver that he/she is ascending too fast?
1. Visual Alarms 2. Audible Alarms
How do you determine the time limit for a repetitive dive from a PDC?
Use the Surface Interval Time feature
What are the 2 main modes of operation of a dive computer?
1. Surface Mode 2. Dive Mode
What are 2 types of weight systems?
1. Belts 2. Pouches on the BCD
What are the 2 types of dive flags commonly flown from a dive boat?
1. Diver Down Flag (red & white) 2. International Flag (blue & white)
Describe the function of a scuba regulator first stage and second stage.
1. First Stage- Attaches to tank and reduces the high pressure air to an intermediate pressure for breathing 2. Second Stage- Delivers air at ambient pressure directly to the diver
A cylindar should be visually inspected at least XXX a year and hydrostatically tested every XXX years in the United States.
1. once a year 2. every five years
What does the abbreviation BCD stand for?
Buoyancy Control Device
State the guages that a console might hold.
1. Submersible Pressure Gauge (SPG) 2. Depth Gauge 3. Compass
A weight belt should be put on with a XXX hand release.
Right
With a weight belt, the excess length should be XXX inches
4-6 inches
The scuba tank is normally filled with
(A) Oxygen
(B) Nitrox
(C) Air
(C) Air
A tank is considered out of air on a dive when
(A) The tank is empty
(B) 200 PSI
(C) 500 PSI
(D) 1,000 PSI
(C) 500 PSI
A snorkel is a required piece of equipment. What side of the mask does a snorkel belong on? Why?
The Left Side. Because your regulator goes on the right side and you don't want the snorkel to get in the way.
How much weight should you put on your weight belt when wearing a wetsuit?
(A) 10% of body weight
(B) 20% of body weight
(C) Enough to become neutral at the surface
(C) Enough to become neutral at the surface
You are wearing a 1/4" wetsuit, you have left the surface and descent has begun. You will need to do what? Explain your choice.
(A) Change the weights on the weight belt
(B) Let the air out of the BCD
(C) Add air to the BCD
(C) Add air to the BCD
The deeper you descend the more the cells in the wet suit compress thus displacing less water. When this happens you become less buoyant and will need to add air to the BCD to bring yourself back to neutral buoyancy.
After returning to the surface, before you take the regulator out of your mouth you should . . .
Add air to the BCD to achieve positive buoyancy
Anytime the regulator leaves your mouth underwater you should . . .
Exhale
After diving you should always do what with your mask, fins, and snorkel.
Rinse them well in fresh water to reduce degridation of the materials.
List 3 components of a compass
1. North Label 2. Lubber line 3. Housing w/360 degree marks 4. Needle 5. Magnetic or Digital Components