6-24. 6-25. 6-26. 6-27. 6-28. 6-29. 6-30. Learning Objective: Inspect and recharge CO₂ cylinders. What color, if any, is CO₂? 1. Pale gray 2. Dark gray 3. Pale blue 4. Colorless A standard supply cylinder will contain how many pounds of CO₂? 1. 10 2. 40 3. 50 4. 80 In its gaseous form, CO₂ is how many times heavier than air? 1. 1.50 2. 1 .53 3. 1.60 4. 1.63 At a temperature of 72°F, CO₂ gas can be converted into a liquid by applying a pressure of how many psi? 1. 400 2. 500 3. 600 4. 700 Depending on temperature and pressure, CO₂ can take on how many different forms? 1. One 2. Two 3. Three 4. Four In its dry ice form, CO₂ has what temperature? 1. -32°F 2. -40°F 3. -90°F 4. -110°F What effect does 3 percent of CO₂ in the atmosphere have on the human body? 1. It causes distorted vision 2. It causes panting 3. It causes unconsciousness 4. It doubles a person’s breathing effort 6-31. 6-32. 6-33. 6-34. 6-35. 6-36. If a person breathed air that had 10 percent CO₂   what would be the effect on the human body? 1. It would cause blurred vision 2. It would cause panting 3. It would cause unconsciousness 4. It would cause marked distress If a person has been overcome by CO₂, which of the following first aid techniques should be used? 1. Giving artificial resuscitation 2. Administering oxygen 3. Keeping them warm 4. All of the above A CO₂ recharge unit will pump CO₂ in which of the following forms? 1. Liquid or gas 2. Liquid only 3. Gas only 4. Liquid, gas, or solid A standard CO₂ supply cylinder will contain approximately how many pounds of liquid CO₂ at a temperature of 70°F? 1. 12 2. 28 3. 38 4. 50 The warmer the supply cylinder, the more efficient will be the transfer operation. 1. True 2. False Why is it a recommended procedure to invert the CO₂ supply cylinder when recharging? 1. It will prevent the hose fitting from freezing shut 2. The CO₂ will remain cooler, allowing it to transfer faster 3. It allows the syphon tube to accept the gas 4. It allows the syphon tube to accept the liquid 35