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Subel. F
A
60 questions
B
72 questions
C
60 questions
D
24 questions
E
24 questions
F
36 questions
G
24 questions
6 questions
41
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43
44
45
46
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Subelement F
Other Equipment and Networks:
Section 45
Depth Finders, Gyro Compass, SSAS, AIS:
45F1
What is a common range of frequencies used for depth finding equipment?
Correct Answer
A.
200-400 kHz
B.
1000-2600 kHz
C.
200-800 Hz
D.
4,000-6,000 kHz
45F1
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45F2
What is a common range of pulse widths used for depth finding equipment?
A.
10 to 30 microseconds
Correct Answer
B.
25
to
600
microseconds
C.
2 to 20 milliseconds
D.
50 to 200 milliseconds
45F2
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45F3
What is the purpose of the "carbon pile" on an older gyro compass?
A.
Ballast regulation
B.
Precession control
Correct Answer
C.
Voltage
regulation
D.
Prevent pendulum effect errors
45F3
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45F4
What are the principles of operation of a fiber-optic gyro compass?
A.
A fiber-optic coil and three accelerometers determine the speed of rotation of the earth.
B.
Two fiber-optic coils with one accelerometer and a level sensor determine the direction of true north.
C.
Three fiber-optic coils with a dual accelerometer and a yaw detector determines the direction of true north.
Correct Answer
D.
Three fiber-optic coils and a dual-axis
electronic
level sensor determine the direction of true north.
45F4
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45F5
How does the Ship Security Alert System operate?
Correct Answer
A.
It sends an alert to
specific
addresses
via the Inmarsat-C terminal.
B.
It sends an all ships alert via the VHF-DSC unit.
C.
It sends an alert to the RCC via the Inmarsat-C terminal.
D.
It sends an all ships alert via MF-HF.
45F5
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45F6
AIS units use the following:
A.
VHF channels 65B ( 160.875 MHz) and 66B ( 160.925 MHz) and 9.6 kbs GMSK modulation.
Correct Answer
B.
VHF channels
87B
(161.975 MHz) and
88B
(162.025 MHz) and 9.6 kbs GMSK modulation.
C.
VHF channels 16 ( 158.800 MHz) and 70 ( 156.525 MHz) and 4.8 kbs GMSK modulation.
D.
VHF channels 18B ( 161.500 MHz) and 19B ( 161.550 MHz) and 4.8 kbs GMSK modulation.
45F6
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