Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG General Navigation (Set 23)
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Question 1 of 30
How can you estimate the position of a tropical storm's center?
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30 MCQs #1 How can you estimate the position of a tropical storm's center? #2 Which theoretical minimum number of measurements from satellites does a GPS receiver need in order to provide an exact three-dimensional position? #3 According to Buys Ballot's law, when an observer in the Northern Hemisphere experiences a northwest wind, the center of low pressure is located to the __________. #4 What classification of tropical cyclone would have closed isobars, counter clockwise rotary circulation, and sustained winds between 34 and 63 knots? #5 When cold air displaces warm air you have a(n) __________. #6 Which condition exists in the eye of a hurricane? #7 Your present weather is sunny with a steady barometer. A low swell approaches your vessel from the south with crests passing at relatively long periods of about four per minute. This usually indicates __________. #8 The barometer is an instrument for measuring the __________. #9 A decrease in barometric pressure is associated with all of the following except __________. #10 Weather conditions in the middle latitudes generally move __________. #11 As a Merchant Marine Officer you are expected to be able to do which of the following? #12 Which cloud commonly produces a halo about the Sun or Moon? #13 A easterly wave is located 200 miles due west of your position, which is north of the equator. Where will the wave be in 24 hours? #14 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. The dry bulb thermometer reads 30°F (-1°C) and the wet bulb thermometer reads 28°F (-2°C). How would you encode the air temperature groups in the report? #15 Which weather element cannot be measured accurately while on board a moving vessel? #16 Which instrument is used to predict the approach of a low pressure system? #17 You have replaced the chart paper in the course recorder. What is NOT required to ensure that a correct trace is recorded? #18 A marine chronometer should be rewound once every __________. #19 The flow of air around an anticyclone in the Southern Hemisphere is __________. #20 Cumulus clouds that have undergone vertical development and have become cumulonimbus in form, indicate __________. #21 Which of the following causes a frontal thunderstorm? #22 With regard to GPS, a civilian receiver may be capable of achieving the same accuracy as a military receiver if __________. #23 An instrument that maintains a continuous record of humidity changes is called a __________. #24 Time signals broadcast by WWV and WWVH are transmitted __________. #25 The pressure-sensitive element of an aneroid barometer is called a __________. #26 An instrument useful in predicting fog is the __________. #27 In mid-ocean, the characteristics of a wave are determined by three factors. What is NOT one of these factors? #28 Which data must ECDIS be able to record at one-minute intervals? #29 When a low pressure area is approaching, the weather generally __________. #30 With respect to failure warnings and status indications, GPS receivers should provide, at a minimum, __________.
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