Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG General Navigation (Set 31)
30:00
|Question 1 of 30
Question Navigator
Correct Incorrect Pending Starred
Question 1 of 30
If a sound signal is emitted from the oscillator of a fathometer, and two seconds elapse before the returning signal is picked up, what depth of water is indicated?
Browse Questions in Set 31
30 MCQs #1 If a sound signal is emitted from the oscillator of a fathometer, and two seconds elapse before the returning signal is picked up, what depth of water is indicated? #2 What is the first visible indication of the presence of a tropical cyclone or hurricane? #3 What does not contribute to the commercial GPS receiver position error? #4 Hurricanes may move in any direction. However, it is rare and generally of short duration when a hurricane in the Northern Hemisphere moves toward the __________. #5 When using a recording depth finder in the open ocean, what phenomena is most likely to produce a continuous trace that may not be from the actual ocean bottom? #6 A vessel entering the eye of a hurricane should expect __________. #7 What should you apply to a fathometer reading to determine the depth of water? #8 An electronic depth finder operates on the principle that __________. #9 The recording fathometer produces a graphic record of the __________. #10 Widely spaced isobars on a weather map indicate __________. #11 Where is the dangerous semicircle located on a hurricane in the Southern Hemisphere? #12 In the Northern Hemisphere, your vessel is believed to be in the direct path of a hurricane, and plenty of sea room is available. The best course of action is to bring the wind on the __________. #13 In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n) __________. #14 The speed at which an ocean wave system advances is called __________. #15 When navigating using GPS, what is an indicator of the geometry of the satellites that your receiver is locked onto? #16 Which feature, when set to zero, might allow a GPS unit to have an accuracy equivalent to Precise Positioning Service receiver capability? #17 The highest level of commercial navigational accuracy is provided by __________. #18 When a tornado moves over the water from land it is called a __________. #19 Which statement concerning GPS is TRUE? #20 Which type of GPS receiver has at least four channels to process information from several satellites simultaneously? #21 At what angle to the isobars do surface winds blow over the open sea? #22 You have been observing your radar screen and notice that a contact on the screen has remained in the same position, relative to you, for several minutes. Your vessel is making 10 knots through the water. Which statement is TRUE? #23 What do the numbers on isobars indicate? #24 Using the surface analysis in illustration D049NG below, what weather conditions would you expect to find at position A? #25 Illustration D011NG below represents the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE? #26 You are radar scanning for a buoy fitted with a racon. In illustration D017NG below, which radar screen represents the presentation you should expect on the PPI? #27 Illustration D011NG below represents the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE? #28 You are approaching a light fitted with a RACON. The light may be identified on the radar by __________. #29 You are anchored in the Aleutian Island chain and receive word that a tsunami is expected to strike the islands in six hours. What is the safest action? #30 The radar control used to reduce sea return at close ranges is the __________.
Question Discussion & Notes
0Have a doubt, memory trick, or exam update? Share your insights with fellow mariners.
Loading mariner discussions...