IN ANSWERING QUESTIONS 12-33 THROUGH 12-44. What is the relative humidity when 12-39, SELECT THE DESCRIPTION FROM COLUMN the amount of water vapor in the B THAT MATCHES THE CHARACTERISTIC IN air has reached the saturation COLUMN A. RESPONSES MAY BE USED MORE THAN point? ONCE. 12-33. 12-34. 12-35. 12-36. 12-37. 12-38. 12-39. A. CHARACTERISTIC 34-40  kn 64 + kn 48-55  kn Sea Heaps Up Moderate high waves Very  high  waves Air  filled  with foam and spray B.  DESCRIPTION 1. Gale 2. Near gale 3.  Storm 4.  Hurricane 12-40. In  Celsius,  what  is  the  freezing 12-41. 12-42. 12-43. point  of  water? 1. -15° 2. -10° 3. 0° 4. 5° In  Celsius,  what  is  the  boiling point  of  water? 1. 90° 2. 95° 3. 100° 4. 110° A temperature of 72°F is equivalent  to  what  Celsius temperature? 1. 161.6° 2. 62.3° 3. 57.7° 4. 22.2° A temperature of 54.8C is equivalent to what Fahrenheit temperature? 1. 134.6° 2. 132.6° 3. 130.6° 4. 128.6° 1. 100% 2. 50% 3. 0% 4. Impossible  to  determine without knowing the air temperature 12-45. What instrument is used to determine relative humidity and dewpoint? 1. Psychrometer 2. Anemometer 3. Aneroid barometer 4. Synchro  repeater 12-46. The difference between the wet-bulb and the dry-bulb thermometer  readings  is  used  to determine which of the following data? 1. Relative humidity 2. Maximum temperature 3. Diurnal variation 4. Minimum temperature 12-47. When you are using a sling psychrometer, in which of the following  positions  should  you  be standing? 1. In  direct  sunlight  facing  the wind 2. In a shaded area facing the wind 3. In  direct  sunlight  away  from the  wind 4. In a shaded area away from the wind 12-48. At which of the following circulating  air  temperatures should  you  energize  the ventilation fan of the electric psychrometer? 1. 49°F 2. 59°F 3. 62°F 4. 70°F 12-49. If the air temperature is 50°F and the  relative  humidity  is  100 percent,  what  is  the  dewpoint? 1. 100°F 2. 80°F 3. 60°F 4. 50°F 81