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单选题
When navigating in thick fog with the radar on，you should（）.
A
station the look-out in the wheelhouse to keep a continuous watch on the radar
B
secure the sounding of fog signals until a vessel closes within five miles
C
station a look-out as low down and far forward as possible
D
keep the radar on the shortest available range for early detection of approaching vessels
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In fog you observe your radar and determine that risk of collision exists with a vessel which is 2 miles off your port bow. You should ______.A.stop your enginesB.sound the danger signal at two-minute intervalsC.hold course and speed until the other vessel is sightedD.take avoiding action as soon as possible
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B:belittled
C:banned
D:collapsed
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单选题You are in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.A
stop your enginesB
sound two prolonged blasts of the whistleC
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slow to bare steerageway
考题
单选题The SART should provide a（）indication of its correct operation and should also inform survivors when it is interrogated by radar.A
sight or soundB
seeing or soundingC
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考题
单选题You hear the fog signal of another vessel forward of your beam.Risk of collision may exist.You MUST（）.A
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考题
单选题When vessel enters thick fog, she should sound（）every two minutes in accordance with the rules.A
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考题
单选题When your vessel enters thick fog，she should sound（）every two minutes in accordance with these Rules.A
one short blastB
one prolonged blastC
two short blastsD
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考题
单选题You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.A
Your speed must be reduced to bare steeragewayB
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Fog signals are only required when a vessel is detected by radarD
The radar should always be kept on a short-range scale
考题
单选题The ship should reduce speed in the thick fog because of（）.A
the poor visibilityB
the fog signalsC
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考题
单选题When using the ARPA in heavy rain，which action should you take? （）A
Increase the radar gain to pick up weak echoes through the rainB
Increase the STC setting to reduce close-in spurious signalsC
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考题
单选题The term restricted visibility，when used in the Rules，refers to（）.A
situations when you can see vessels on radar that you cannot see visuallyB
visibility of less than half a mileC
any condition where visibility is restrictedD
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单选题You are underway in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.A
stop your enginesB
sound two prolonged blasts of the whistleC
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congestingB
congestedC
congestionD
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考题
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You should maneuver in ample time if a close-quarters situation is developingC
You should determine the course and speed of all radar contacts at six minutes intervalsD
Long-range scanning will provide early warning of all other vessels within the radar’s range
考题
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考题
单选题In dense fog a vessel without operational radar may not be justified（）at all but should anchor if it is safe and practicable for her to do so.A
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考题
单选题Small floes of rough，hummocky sea ice capable of damaging a vessel（）.A
can usually be detected by radar in a smooth sea at a range of 4 to 6 kilometersB
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单选题In fog you observe your radar and determine that risk of collision exists with a vessel which is 2 miles off your port bow. You should（）.A
stop your enginesB
sound the danger signal at two-minute intervalsC
hold course and speed until the other vessel is sightedD
take avoiding action as soon as possible
考题
单选题You are underway in thick fog.You have not determined if risk of collision exists.Which statement is true?（）A
Your speed must be reduced to bare steerage waysB
A look-out is not required if the radar is onC
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Fog signals are only required when a vessel is detected by radar
考题
单选题In order to ensure that a RACON signal is displayed on the radar，you should（）.A
increase the brilliance of the PPI scopeB
turn off the interference controls on the radarC
use the maximum available range settingD
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考题
单选题A vessel is “in sight” of another vessel when（）.A
she can be observed by radarB
she can be observed visually from the other vesselC
she can be plotted on radar well enough to determine her headingD
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考题
单选题When using the radar for navigating（）.A
the best fix is obtained by using a tangent bearing and a rangeB
and using two radar ranges for a fix，the objects of the ranges should be close to reciprocal bearingsC
and using ranges，the most rapidly changing range should be measured lastD
and crossing a radar range of one object with the visual bearing of a second object，the two objects should be 80°to 110°apart
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