3-9. The primary use of the marine barograph is to determine 1.   3-hour   pressure   tendencies 2.   sea-level   pressure 3.  altimeter  setting 4.   station   pressure 3-10. How often should recording charts be replaced on the barograph? 1. Once a quarter 2. Once a week 3. Every 4 days 4. Every  day 3-11. What type of purple ink should you use to reink a barograph pen? 1. Fountain-pen ink 2.    Recording  ink 3.      Stamp-pad   ink 4.    Ball-point-pen  ink 3-12. What is the maximum number of indicators that may be connected to each AN/UMQ-5 wind measuring system? 1. One 2. Two 3. Five 4. Six 3-13. Which of the following indicators/recorders is used primarily by air traffic control personnel? 1.      ID-2447/U 2.      RD-108/UMQ-5 3.    ID-300/UMQ-5 4.    ID-586/UMQ-5 3-14. 3-15. 3-16. 3-17. 3-18. While operating at the standard speed, the RD-108/UMQ-5 recorder can run for approximately how many days before the chart must be changed? 1. 30 2. 15 3. 10 4. 7 What kind of wind is measured by the Type B-3 wind indicator? 1.   True 2.  Total 3.  Relative 4.   Magnetic If the apparent winds are read on the wind indicator as 120° at 27 knots, and the ship is moving toward True North, which of the following computed true winds is most likely correct? 1. 140° at 33 knots 2. 090° at 23 knots 3. 230° at 40 knots 4. 330° at 25 knots What is the purpose for depressing the trigger on the AN/PMQ-3 hand-held anemometer? 1. To check calibration 2. To release the wind vane 3. To switch to the high scale 4. To switch to the low scale How often should the wind-speed transmitter unit of the AN/PMQ-3 be oiled? 1. After each use 2. Once per month 3. Twice per quarter 4. Twice per year 20