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แบบฝึกหัดพนักงานวิทยุคมนาคมประเภททั่วไปประจำเรือ(GOC)
แบบฝึกหัดพนักงานวิทยุสมัครเล่น
ขั้นต้น
ขั้นกลาง
ขั้นสูง
แบบฝึกหัดพนักงานวิทยุคมนาคมประเภททั่วไปประจำเรือ (GOC)
หมวดที่ 1. General Information and System Overview และ Principles of Communications
หมวดที่ 2. F.C.C. Rules & Regulations และ DSC & Alpha-Numeric ID
หมวดที่ 3. Distress, Urgency & Safety Communications และ Section-F: Survival Craft Equip & S.A.R
หมวดที่ 4. VHF-DSC Equipment & Communications และ Maritime Safety Information (M.S.I.)
หมวดที่ 5. Inmarsat Equip. & Communications และ MF-HF Equip. and Communications
แบบฝึกหัดพนักงานวิทยุคมนาคมประเภทจำกัดเขตเดินเรือทะเล (ROC)
หมวดที่ 1. General Information and System Overview และ F.C.C. Rules & Regulations
หมวดที่ 2. DSC & Alpha-Numeric ID Systems และ Distress, Urgency & Safety Communication
หมวดที่ 3. Survival Craft Equip & S.A.R, Maritime Safety Information (M.S.I.) และ VHF-DSC Equipment & Communication
เฉลย
ทดสอบอีกครั้ง
คำถามที่ 1/50
90:00
นาที
1
What is the importance of a successful log in indication, after power-up, on an Inmarsat-C terminal?
A.
The antenna Azimuth and Elevation controls are correctly adjusted.
B.
The terminal is enabled for routine incoming and outbound traffic.
C.
The receiver gain is properly adjusted for maximum signal.
D.
Unscheduled EGC MSI messages can no longer be received.
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คำถามที่ 2/50
90:00
นาที
2
Which longitude corresponds to the POR's satellite location for Inmarsat-B/C communications?
A.
64E
B.
15.5W
C.
54W
D.
178E
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คำถามที่ 3/50
90:00
นาที
3
What is the primary danger of improperly logging out?
A.
The vessel will be barred in the future from sending traffic through an LES.
B.
The NCS ensures that improper log-out procedures do not occur.
C.
Scheduled MSI may not be available through the Inmarsat-C terminal.
D.
Your company or another ship may accrue significant charges when their traffic is repetitively sent to your unavailable terminal.
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คำถามที่ 4/50
90:00
นาที
4
What is the primary function of a LES?
A.
To provide direct communications between the Inmarsat station placing a call and the station receiving the call.
B.
To monitor and control communications through the Inmarsat satellite for which it is responsible.
C.
To provide multi-mode communications between the Inmarsat station placing a call and the coast radio station that will deliver it.
D.
To determine which satellite is best suited to provide communications between the Inmarsat station placing a call and the station receiving the call.
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คำถามที่ 5/50
90:00
นาที
5
To keep the Inmarsat-B or F77 antenna pointing at the desired satellite, regardless of the ship's position and course, it has an input from the vessel's:
A.
Operational radar
B.
Automated Radar Plotting Aid (ARPA equipped radar)
C.
Steering control system
D.
Gyrocompass
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คำถามที่ 6/50
90:00
นาที
6
What is the primary purpose of an Inmarsat LES?
A.
The LES is required for ship-ship Inmarsat communications, ship-shore communications are handled by terrestrial Coast Radio Stations.
B.
The LES monitors all operations of the satellite and assigns channels and frequencies to the vessel.
C.
The LES makes the satellite connection between the vessel and the requested destination for all types of services.
D.
The LES is dedicated only to processing all vessel Distress priority calls.
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คำถามที่ 7/50
90:00
นาที
7
Which mode of Inmarsat-B communications may be possible with a lower received signal strength?
A.
Fax
B.
Voice Communications
C.
TELEX
D.
Binary computer file transfers
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คำถามที่ 8/50
90:00
นาที
8
What is the purpose of the second I.D. in an Inmarsat-B or F77 SES?
A.
To provide an alternate number which may be called if a busy signal is received by the calling party.
B.
To provide an additional speech path, which may be used to communicate while the first channel is engaged in active communications.
C.
To provide for an emergency working frequency.
D.
To provide an additional number which may be dedicated to computers, fax, etc.
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คำถามที่ 9/50
90:00
นาที
9
What are the directional characteristics of the Inmarsat-C SES antenna?
A.
Highly directional parabolic antenna requiring stabilization.
B.
Omni-directional.
C.
Wide beam width in a cardioid pattern off the front of the antenna.
D.
Very narrow beam width straight-up from the top of the antenna.
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คำถามที่ 10/50
90:00
นาที
10
Which mode of communication is possible through an Inmarsat-C SES?
A.
SITOR (NBDP)
B.
Radiotelephone
C.
TELEX and e-mail
D.
DSC
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คำถามที่ 11/50
90:00
นาที
11
Which LES should a GMDSS Radio Operator select to update a Distress alert message if the vessel is in the southern Pacific Ocean near the Dateline?
A.
Santa Paula (USA) or Beijing (PRC) would be the best choice depending on SAR jurisdiction.
B.
Kumsan (South Korea) or Sentosa (Singapore) would be the best choice depending on SAR jurisdiction.
C.
Yamaguchi (Japan) or Nakhoda (Russia) would be the best choice depending on SAR jurisdiction.
D.
Auckland (New Zealand) or Santa Paula (USA) would be the best choice depending on SAR jurisdiction.
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คำถามที่ 12/50
90:00
นาที
12
If you are tracking the POR satellite and wish to communicate by voice using LES Santa Paula with another ship tracking the AOR-E satellite what is the proper procedure?
A.
Select LES: 001# then dial 00870323972310#
B.
Select LES: 004# then dial 11582430315036#
C.
Select LES: 001# then dial 00851636824323#
D.
Select LES: 003+ then dial 00581430326430+
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คำถามที่ 13/50
90:00
นาที
13
Which number, if typed at an Inmarsat-B SES by a vessel in the Western Atlantic, would result in placing an automatic TELEX call to a subscriber number of 123456?
A.
00230123456+
B.
00230123456#
C.
0012131234567#
D.
00 1 213 1234567+
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คำถามที่ 14/50
90:00
นาที
14
Which of the following is a correctly formatted Inmarsat-C address book entry for sending TELEX communications to an Inmarsat-B terminal in the AOR-W?
A.
584765044177
B.
584331014013
C.
870331014013
D.
584331014013+
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คำถามที่ 15/50
90:00
นาที
15
Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a shoreside TELEX terminal number 440122 in the United Kingdom (TELEX country code 51)?
A.
51440122+
B.
(51)440122
C.
51440122
D.
51440122#
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คำถามที่ 16/50
90:00
นาที
16
If your vessel is in the POR, which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a shoreside TELEX terminal number 42267 in Ecuador (TELEX country code 308)?
A.
58230842267
B.
30842267+
C.
(582)30842267
D.
30842267
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คำถามที่ 17/50
90:00
นาที
17
Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a shoreside terminal number 276992 in New Jersey via TRT (TELEX country code 238)?
A.
238276992
B.
(238)276992
C.
238276992#
D.
238276992+
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คำถามที่ 18/50
90:00
นาที
18
Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a fax machine on a vessel’s F77 terminal in the IOR?
A.
870763240864
B.
583442519372
C.
1870442519372
D.
870323500121
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คำถามที่ 19/50
90:00
นาที
19
What menu function in Inmarsat-C terminals would typically be used to specify an Internet address destination?
A.
The System Setup menu to store all required e-mail destinations.
B.
The Address book function (or manual entry) in the SEND/REC or TRANSMIT menu.
C.
The Data Report menu to initiate the SEND/REC or TRANSMIT process.
D.
The menus for File Operations are used for adding the Internet address to the file.
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คำถามที่ 20/50
90:00
นาที
20
If an Inmarsat Distress Alert Setup menu contains an incorrect or unavailable LES code what happens to the Distress Alert transmission?
A.
The NCS updates the LES codes in the Distress Alert Setup menu as the vessel moves from ocean region to ocean region to ensure this does not happen.
B.
The NCS will send a Distress Alert Setup incorrect LES code alarm so the alert can be corrected and re-transmitted.
C.
The NCS will step in and route the Distress Alert transmission to an RCC.
D.
If the LES code is incorrect then the Distress Alert transmission is not detected by any RCC.
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คำถามที่ 21/50
90:00
นาที
21
Detailed Distress situation report message formats can best be found in?
A.
IAMSAR manual Volume III.
B.
ITU list of RCC and Coast stations.
C.
AMVER chapter of NGA PUB 117.
D.
FCC Title 47, Part 80.
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คำถามที่ 22/50
90:00
นาที
22
What can be defined as the service that allows terrestrial information providers to send general information messages to pre-defined groups of subscribers?
A.
SafetyNETTM
B.
FleetNETTM
C.
COSPAS-SARSAT
D.
InfoNET
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คำถามที่ 23/50
90:00
นาที
23
Which of the following is utilized to transmit Enhanced Group Calls?
A.
COSPAS satellite
B.
HF SITOR (NBDP) shore stations
C.
NAVTEX shore stations
D.
Inmarsat satellite
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คำถามที่ 24/50
90:00
นาที
24
What is the equipment arrangement that provides the maximum availability for reception of MSI broadcasts when using Inmarsat-C for TELEX communications?
A.
Separate EGC receiver.
B.
Integrating EGC receiver with the existing Inmarsat-C equipment.
C.
Redundancy using HF SSB to receive voice broadcasts.
D.
Automatic switching between Inmarsat-C and EGC functions.
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คำถามที่ 25/50
90:00
นาที
25
What maintenance function may the holder of a GMDSS Radio Operator license perform, or supervise the performance of, on an Inmarsat-C SES?
A.
Painting the antenna dome.
B.
Adjust the station's EIRP.
C.
Adjust any front panel controls.
D.
Adjust a reference oscillator or synthesizer.
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คำถามที่ 26/50
90:00
นาที
26
Which statement regarding GMDSS MF/HF Transceiver frequency set-up is true:
A.
Manual keypad entries are quicker and more certain than using the database.
B.
All consoles ensure that manual keypad entries are checked for legal outcomes.
C.
All consoles ensure that ITU channel recall from a database produces accurate and legal outcomes.
D.
Using the manufacturer’s database typically produces a more swift and certain result.
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คำถามที่ 27/50
90:00
นาที
27
Which statement regarding GMDSS MF/HF Transceiver frequency set-up is true:
A.
Some consoles allow both manual keypad entry and ITU channel recall from a database or memory.
B.
Transmit and receive frequencies must always be manually entered from the keypad.
C.
Transmit and receive frequencies must always be recalled from a database or memory.
D.
Frequencies in the manufacturer’s databases are always accurate and legal for use.
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คำถามที่ 28/50
90:00
นาที
28
How are paired SSB frequencies normally used?
A.
These are normally used for FEC communications with coast radio stations.
B.
These are normally used for J3E communications with coast radio stations.
C.
These are normally used for ARQ communications with coast radio stations.
D.
These are normally used for DSC communications with coast radio stations.
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คำถามที่ 29/50
90:00
นาที
29
What is meant by the term duplex "ITU channel"?
A.
This refers to a vessel's SELCAL number.
B.
A standardized series of frequency pairings for common use.
C.
This refers to VHF channels 1-28 and 60-88.
D.
A series of frequency pairings used for ship-ship communications.
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คำถามที่ 30/50
90:00
นาที
30
The purpose of ITU channel spacing is:
A.
To minimize the number of voice & TELEX channels available.
B.
To make most efficient use of the radio spectrum, by using voice channels rather than TELEX channels.
C.
To make most efficient use of the radio spectrum, by using TELEX channels rather than voice channels.
D.
To minimize the possibility of interference from adjacent channels.
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คำถามที่ 31/50
90:00
นาที
31
Communications with an emission of J3E would typically have a channel spacing of:
A.
0.5 kHz
B.
0.3 kHz
C.
3.0 kHz
D.
2.8 kHz
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คำถามที่ 32/50
90:00
นาที
32
The proper sequence of emissions corresponding to the sequence SSB-Voice without carrier, USB-Voice with carrier, FM-Voice and SITOR (NBDP) TELEX is:
A.
J3E, H3E, F3E, F1B.
B.
H3E, J3E, F3E, F1B.
C.
J3E, H3E, F1B, F3E.
D.
H3E, J3E, F1B, F3E.
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คำถามที่ 33/50
90:00
นาที
33
Through which coast radio station(s) may a U.S.-flag merchant vessel communicate?
A.
Any coast radio station in the world that is licensed to provide such communications.
B.
Any coast radio station in the world that is licensed to provide such communications, but prior authorization must be obtained for a U.S.-flag merchant vessel to communicate through a non-U.S. station.
C.
The U.S. Coast Guard coordinates the communications and assigns the working channel.
D.
U.S. flag ships are licensed to communicate only with U.S. coast radio stations.
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คำถามที่ 34/50
90:00
นาที
34
A "Distress Hot Key" MF/HF DSC Distress alert:
A.
Will be transmitted on 2187.5 kHz or another DSC frequency, depending on the manufacturer.
B.
Will always be transmitted on 2187.5 kHz and 8414.5 kHz to trip DSC alarms on the mandatory MF/HF DSC watch frequencies.
C.
Will always be transmitted on 2187.5 kHz first to alert the nearest vessels and coast stations.
D.
Will always be sent first on 16804.5 kHz to reach coast stations far away from the vessel.
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คำถามที่ 35/50
90:00
นาที
35
Which statement best defines the SITOR (NBDP) acronym "ARQ"?
A.
Error Correction when 2 stations are in direct & phased telephone communications with each other.
B.
Error correction for one-way TELEX transmissions to a single other station.
C.
Error correction for one-way TELEX broadcasts of weather or navigation information.
D.
Error Correction with 2 stations are in direct & phased TELEX communications with each other.
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คำถามที่ 36/50
90:00
นาที
36
The purpose of "parity" in SITOR (NBDP) communications is?
A.
Error correction in HF BFEC MSI broadcasts, SFEC NAVTEX broadcasts and two way ARQ exchanges.
B.
Error correction in SFEC NAVTEX broadcasts, HF SFEC MSI broadcasts and two-way ARQ exchanges.
C.
Error correction in BFEC NAVTEX broadcasts, HF BFEC MSI broadcasts and one-way ARQ broadcasts.
D.
Error correction in HF BFEC MSI broadcasts, NAVTEX broadcasts and two-way ARQ exchanges.
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คำถามที่ 37/50
90:00
นาที
37
During ARQ communications, which of these is least likely to cause a coast station to break the phased radio connection:
A.
If the error percentage of repeat requests becomes too high.
B.
If the operator enters "BRK+".
C.
If the automatic exchange of answerbacks is interrupted by keyboard entries.
D.
If the operator enters "NNNN" at the end of the message.
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คำถามที่ 38/50
90:00
นาที
38
What sequence of ARQ codes matches the following: Send synoptic weather, switch control from a station currently transmitting over to the receiving station, terminate phasing with coast station.
A.
OBS+, +?, BRK+
B.
OBS+, WRU then Here is, BRK+
C.
OBS+, GA+?, KKKK
D.
AMV+, +?, KKKK
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คำถามที่ 39/50
90:00
นาที
39
What sequence of ARQ codes matches the following: shore station indicates it is awaiting instructions from the vessel, vessel requests a live connection to a land telex number, vessel indicates it is done with the coast station?
A.
WRU-AAB, DIRTLX, NNNN
B.
GA+?, DIRTLX, BRK+
C.
GA+?, DIRTLX, KKKK
D.
WRU-AAB, DIRTLX, .....
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คำถามที่ 40/50
90:00
นาที
40
Which of the following is true of SITOR (NBDP) ARQ mode?
A.
This is an interactive mode.
B.
Each character is repeated three times.
C.
Each character is transmitted twice.
D.
This mode is generally used to broadcast messages.
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คำถามที่ 41/50
90:00
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41
In ARQ, when the information sending station (ISS) receives a signal that the parity check failed what happens?
A.
The next block will be sent.
B.
The data link will break.
C.
The acknowledge light should illuminate.
D.
The last block will be resent.
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คำถามที่ 42/50
90:00
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42
Which of the following is true of SITOR (NBDP) ARQ mode:
A.
The ship station sends a group of 3 characters, the shore station checks for proper parity. If parity is OK, the shore station indicates readiness for transmission of the next 3 characters.
B.
The ship station sends a group of 3 characters twice and then waits for an "RQ" signal to indicate proper receipt before continuing transmission.
C.
The Ship station sends each character twice, using a time diversity system to ensure proper parity.
D.
The ship station sends a group of 3 characters, the shore station checks for proper parity and then requests the same group be resent to enable error correction.
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คำถามที่ 43/50
90:00
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43
To correctly address a SITOR (NBDP) message and transmit it "live" to a shore-based office the GMDSS operator would dial which sequence:
A.
DIRTLX0051440344+
B.
DIRTLX051440344+
C.
DIRTLX581440344+
D.
DIRTLX05811500260+
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คำถามที่ 44/50
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44
Which of the following is true of SITOR (NBDP) Mode B (FEC), in the presence of static crashes.
A.
FEC reduces the error rate by transmitting each character twice.
B.
Data flow rate depends on signal propagation.
C.
Idle characters are sent upon request.
D.
Transmitter and receiver cannot synchronize.
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คำถามที่ 45/50
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45
Which of the following statements concerning SITOR (NBDP) communications is true?
A.
FEC requests are first acknowledged by the vessel's transmitter before broadcasts can be received.
B.
FEC mode broadcasts can be passively received without the transmitter being active.
C.
Weather broadcasts are always made in ARQ mode to ensure reception.
D.
ARQ mode communications can be passively received without the transmitter being active.
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คำถามที่ 46/50
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46
GMDSS operators should learn which of the following propagation "rules of thumb"?
A.
Longer distance = lower frequency, Shorter distance = higher frequency; Daytime = higher frequency, nighttime = lower frequency.
B.
Longer distance = lower frequency, Shorter distance = lower frequency, Daytime = lower frequency, nighttime = higher frequency.
C.
Longer distance = higher frequency, Shorter distance = lower frequency, Daytime = higher frequency, nighttime = lower frequency.
D.
Longer distance = higher frequency, Shorter distance = higher frequency, Daytime = lower frequency, nighttime = higher frequency.
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คำถามที่ 47/50
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47
GMDSS operators should routinely focus on the factors affecting propagation in what priority?
A.
Distance & time of day, seasonal variations, sunspot cycle, solar flare alerts.
B.
Sunspot cycle, distance & time of day, seasonal variations, solar flare alerts.
C.
Solar flare alerts, distance & time of day, sunspot cycle, seasonal variations.
D.
Solar flare alerts, sunspot cycle, seasonal variations, distance & time of day.
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48
At mid-night, what would be the best choice in attempting to communicate, using SITOR (NBDP) with a shore station some 800 miles distant?
A.
VHF-FM
B.
Higher UHF bands
C.
Communications are impossible at this distance.
D.
HF bands
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49
What is a gel cell battery and how is it maintained & cared for?
A.
Gel cell batteries are typically sealed; special charging rates and voltages may be required.
B.
Gel cell batteries are lead acid with a solid electrolyte; each cell is checked with a voltmeter.
C.
Gel cell batteries are NICAD with a solid electrolyte; each cell is checked with a voltmeter.
D.
Gel cell batteries are have special liquid electrolytes; they are charged with the NICAD charging rates and voltages.
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50
Your MF-HF whip antenna breaks off and is carried away in a storm. What would you do to regain operation on MF-HF frequencies?
A.
Rig a wire antenna approximately 35-40 ft long per the equipment instruction manual.
B.
Rig a wire antenna 10-15 ft long from the antenna tuner to the highest vertical support.
C.
Rig a horizontal, center-fed dipole antenna 40 ft long.
D.
Rig a long wire antenna at least 200 ft long.
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