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เลขที่บัตรประชาชน
ขอรหัสผ่าน
แบบฝึกหัดพนักงานวิทยุคมนาคมประเภทจำกัดเขตเดินเรือทะเล(ROC)
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
Which of the following would most likely not prevent a SART's signal from being detected?
A.
The rescue personnel were monitoring the 3-CM radar and the SART was mounted improperly in the lifeboat.
B.
The SART was mounted improperly in the survival craft and rescue personnel were monitoring the 10-CM radar.
C.
The rescue personnel were monitoring the 10-CM radar and the SART was properly mounted in the lifeboat.
D.
The SART was properly mounted in the lifeboat and rescue personnel were monitoring the 3-CM radar.
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คำถามที่ 2/50
90:00
นาที
2
How can a SART's detection and effective range be maximized?
A.
The SART should be held or mounted as high as possible and in a vertical position.
B.
The SART should be placed in water immediately so it will begin transmitting.
C.
Switch the SART into the "high" power position.
D.
If possible, the SART should be mounted horizontally so that its signal matches that of the searching radar signal.
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คำถามที่ 3/50
90:00
นาที
3
Which statement is NOT true regarding the SART?
A.
Responds to interrogations by a vessel's X-Band radar and transmits a signal.
B.
This is a 6 GHz transponder capable of being received by a vessel's X-band navigational radar system.
C.
This is a 9 GHz transponder capable of being received by a vessel's X-band navigational radar system.
D.
Transmits a distinctive 12-blip signal for easy recognition.
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คำถามที่ 4/50
90:00
นาที
4
Why is it important to limit the duration of testing a SART?
A.
Excessive testing causes "burn in" on the vessel's radar display.
B.
Testing in port or even at sea may cause interference to other radars or a test signal may be misinterpreted as a genuine Distress situation.
C.
To prevent overheating, a SART requires sufficient ventilation that is significantly reduced when the SART is being tested.
D.
If another SART is testing at the same time, the two signals will cause damage to the unit that transmitted them.
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คำถามที่ 5/50
90:00
นาที
5
Why should functional testing of a SART be minimized?
A.
Potential interference with safe navigation, notifying other vessels of an actual Distress and minimize power consumption.
B.
Minimize power consumption of the battery and only test at sea to reduce potential interference or confusion.
C.
Possibility of misinterpretation by other vessels as a Distress situation and only test in port to prevent potential interference with safe navigation or at-sea vessels.
D.
Potential interference with safe navigation, possible misinterpretation of an actual Distress, minimizes draining the battery.
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คำถามที่ 6/50
90:00
นาที
6
The SART is required to have sufficient battery capacity to operate in the stand-by mode for what period of time?
A.
Three days
B.
Four days
C.
Eight hours
D.
Forty-eight hours
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คำถามที่ 7/50
90:00
นาที
7
Which of the following statements concerning COSPAS-SARSAT is false?
A.
EPIRBs, ELTs, and PLBs use the system primarily for Distress alerting.
B.
These satellites monitor 406 MHz for EPIRB signals.
C.
After initiating a call request and selecting the LES, these satellites may be used for commercial messages.
D.
These satellites use Doppler shift measurement to determine the location of the beacons.
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คำถามที่ 8/50
90:00
นาที
8
Which of the following statements concerning EPIRBs is false?
A.
The COSPAS-SARSAT system may take a full hour or more to provide an alert.
B.
The Inmarsat system provides worldwide coverage for Distress alerts.
C.
The GOES weather satellites are in a geostationary orbit.
D.
406 MHz EPIRB units may be equipped with GPS receivers.
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คำถามที่ 9/50
90:00
นาที
9
Which piece of required GMDSS equipment is the primary source of transmitting locating signals?
A.
Radio Direction Finder (RDF).
B.
Survival Craft Transceiver.
C.
An EPIRB transmitting on 406 MHz.
D.
A SART transmitting on 406 MHz.
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คำถามที่ 10/50
90:00
นาที
10
What part of a satellite EPIRB may function as a visual aid to rescue vessels?
A.
Strobe light
B.
A 121.5 MHz emergency transmitter in a satellite EPIRB.
C.
406 MHz signal from a satellite EPIRB.
D.
Loud beeping tone emitted by the unit, once activated.
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คำถามที่ 11/50
90:00
นาที
11
What is an example of a locating signal?
A.
SSB phone traffic
B.
Ship to shore transmissions
C.
Loran C
D.
A float-free EPIRB
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คำถามที่ 12/50
90:00
นาที
12
Which statement is NOT true regarding the requirements of VHF Survival Craft Transceivers?
A.
Operation on Ch-13 is mandatory.
B.
Effective radiated power should be a minimum of 0.25 Watts.
C.
Simplex (single frequency) voice communications only.
D.
Operation on Ch-16 is mandatory.
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คำถามที่ 13/50
90:00
นาที
13
Which of the following channels is designated as the VHF follow-on communications channel and is required in all portable survival craft equipment?
A.
Ch-16
B.
Ch-6
C.
Ch-13
D.
Ch-70
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คำถามที่ 14/50
90:00
นาที
14
Which statement is NOT true regarding the COSPAS-SARSAT system?
A.
EPIRBs are satellite beacons used as alerting/locating devices.
B.
May be used to transmit public correspondence.
C.
Locates Distress beacons transmitting on 406 MHz.
D.
Doppler shift is used to locate the beacons.
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คำถามที่ 15/50
90:00
นาที
15
What information should be contained in a detailed Distress message that was not transmitted by an initial Distress “hot-key” alert?
A.
Vessel position, course & speed and the nature of Distress.
B.
The distress vessel’s IMN and position at the time of alert.
C.
Vessel name & call sign, POB and all potential means to communicate with the vessel.
D.
Vessel name & call sign, distress vessel’s IMN & vessel position.
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คำถามที่ 16/50
90:00
นาที
16
What should a GMDSS Radio Operator do if a NAVTEX warning message is received but it contains too many errors to be usable?
A.
Contact the NAVAREA coordinator and request a repeat broadcast.
B.
Initiate a request for Category A, B, L and D messages.
C.
Do nothing. Vital NAVTEX messages will be repeated on the next scheduled broadcast.
D.
Listen to appropriate VHF weather channel for repeat warnings.
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คำถามที่ 17/50
90:00
นาที
17
What is the transmitting range of most NAVTEX stations?
A.
Typically 50-100 nautical miles (90-180 km) from shore.
B.
Typically 200-400 nautical miles (360-720 km).
C.
Typically upwards of 1000 nautical miles (1800 km) during the daytime.
D.
It is limited to line-of-sight or about 30 nautical miles (54 km).
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คำถามที่ 18/50
90:00
นาที
18
Which of the following statements is true?
A.
No NAVTEX receiver can be programmed to reject category A, B, D and L messages since they are mandatory to be received via NAVTEX.
B.
A GMDSS Radio Operator may choose to program certain NAVTEX receivers to reject category A, B, D and L messages if they are being received by another MSI system.
C.
Upon entering a new NAVTEX station's broadcast range, the GMDSS Radio Operator enters the station's SELCAL number.
D.
The GMDSS Radio Operator can select the "None" option in the message category menu.
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คำถามที่ 19/50
90:00
นาที
19
What means are used to prevent the reception of unwanted broadcasts by vessels utilizing the NAVTEX system?
A.
Operating the receiver only during daytime hours.
B.
Coordinating reception with published broadcast schedules.
C.
Programming the receiver to reject certain stations and message categories.
D.
Automatic receiver de-sensitization during night hours.
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คำถามที่ 20/50
90:00
นาที
20
How are NAVTEX broadcasts transmitted?
A.
Using FEC techniques.
B.
NAVTEX is transmitted by commercial coast radio stations following their traffic lists.
C.
NAVTEX is transmitted only when an Urgency or Distress broadcast is warranted.
D.
No more often than every two hours and should immediately follow the radiotelephone silent periods.
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คำถามที่ 21/50
90:00
นาที
21
What determines whether a NAVTEX receiver prints a particular type of message content from a programmed NAVTEX station?
A.
The serial number and type of message have already been received but additional printouts are generated to ensure receipt aboard the vessel.
B.
The serial number and type of message has not been previously received or the subject indicator has not been programmed for rejection.
C.
The subject indicator has been programmed for rejection by the operator but the message contains a priority override print command.
D.
The transmitting station ID covering your area has been programmed for rejection by the operator or has not been previously received.
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คำถามที่ 22/50
90:00
นาที
22
Which information determines if a NAVTEX message is to be rejected?
A.
Transmitter identity (numerals from 1 to 26 identifying transmitting station within the NAVAREA).
B.
The second letter (from A to Z) in the header indicating the type of message.
C.
The Answerback of the receiving station has not been entered in the NAVTEX receiver.
D.
Only messages having a serial number 00 are rejected.
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คำถามที่ 23/50
90:00
นาที
23
NAVTEX broadcasts are sent:
A.
Immediately following traffic lists.
B.
On request of maritime mobile stations.
C.
In categories of messages indicated by a single letter or identifier.
D.
Regularly, after the radiotelephone silent periods.
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คำถามที่ 24/50
90:00
นาที
24
Aboard ship, SafetyNETTM. messages can be received by which equipment/methods?
A.
EGC receiver of the vessel's Inmarsat-C SES.
B.
VHF DSC on the weather channels.
C.
NAVTEX Receiver on 518 kHz or the Tropical Navtex frequency
D.
HF SITOR (NBDP) MSI frequencies.
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คำถามที่ 25/50
90:00
นาที
25
SafetyNETTM. messages can be received by which of the following shipboard equipment?
A.
NAVTEX
B.
MF and HF SITOR (NBDP)
C.
Inmarsat F77 EGC receiver
D.
Inmarsat-C EGC receiver
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คำถามที่ 26/50
90:00
นาที
26
What information is promulgated by the international SafetyNETTM?
A.
Traffic Lists
B.
Priority Messages
C.
MARAD
D.
MSI
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คำถามที่ 27/50
90:00
นาที
27
To receive all mandatory MSI using the SafetyNETTM. system the vessel must:
A.
Log-in and ensure the position is accurate to receive MSI for the NAVAREA the vessel is currently within.
B.
Notify the NAVAREA coordinator you are using SafetyNETTM for the receipt of MSI (Maritime Safety Information).
C.
Set the receiver to your destination Inmarsat Ocean Region.
D.
Notify the NAVAREA coordinator you are using SafetyNETTM for the receipt of MSI (Maritime Safety Information) and set the receiver to your destination Ocean Region.
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คำถามที่ 28/50
90:00
นาที
28
Which of the following provides a unique automated system capable of addressing messages to pre-determined groups of ships or all vessels in both fixed and variable geographic areas?
A.
NAVTEX
B.
EGC
C.
AFRTS
D.
NAVAREAs
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คำถามที่ 29/50
90:00
นาที
29
What system may be useful for messages, such as local storm warnings or a shore-to-ship Distress alert, for which it is inappropriate to alert all ships in the satellite coverage area?
A.
NAVTEX
B.
AMVER
C.
EGC
D.
DSC
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คำถามที่ 30/50
90:00
นาที
30
What messages originate from registered information providers anywhere in the world and are broadcast to the appropriate ocean region via a LES?
A.
AMVER broadcasts
B.
Urgency messages
C.
NAVTEX broadcasts
D.
SafetyNETTM messages
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คำถามที่ 31/50
90:00
นาที
31
The “Scan” function is used to:
A.
Monitor Ch-16 continuously and switching to either Ch-70 or Ch-13 every 5 seconds.
B.
Sequentially scan all or selected channels.
C.
Scan Ch-70 for Distress alerts.
D.
None of the above.
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คำถามที่ 32/50
90:00
นาที
32
Which of the following factors does not normally affect the range of VHF transmissions?
A.
Salt water ingress into the antenna coaxial cable.
B.
Power level setting.
C.
Vessel antenna height.
D.
Ionospheric refraction.
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คำถามที่ 33/50
90:00
นาที
33
Much longer than normal VHF transmissions are typically caused by:
A.
Atmospheric ducting or tropospheric propagation.
B.
Changing power from 1W to 25 W.
C.
Skywave reflections from the D layer.
D.
Ionospheric activity in layers F1/F2.
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คำถามที่ 34/50
90:00
นาที
34
The effectiveness of VHF communications is maximized by:
A.
Appropriate setting of the transmitter power, selecting an appropriate channel & adjustment of squelch for maximum receiver sensitivity.
B.
The adjustment of squelch for maximum receiver sensitivity, setting transmitter power to 1W & selecting an appropriate channel.
C.
Selecting an appropriate channel, adjustment of squelch for minimum receiver sensitivity & setting transmitter power to 1W.
D.
Selecting an appropriate channel, adjustment of squelch for minimum receiver sensitivity, setting transmitter power to 25W.
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คำถามที่ 35/50
90:00
นาที
35
What channel is always being continuously monitored?
A.
Ch-70
B.
Ch-28
C.
Ch-80
D.
Ch-16
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คำถามที่ 36/50
90:00
นาที
36
Which of the following channels may be used for duplex communications?
A.
Ch-70
B.
Ch-26
C.
Ch-5A
D.
Ch-22A
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คำถามที่ 37/50
90:00
นาที
37
The USA-INT control on VHF units:
A.
Selects duplex operations for U.S. coastal waters and simplex operations in non-U.S. waters, on the "alpha" channels.
B.
Ensures that the “alpha” channels are correctly set to duplex for use in U.S. waters & on VTS channels.
C.
Changes selected international duplex channels to simplex channels for use in U.S. waters, on the "alpha" channels.
D.
Changes selected international simplex channels to duplex channels for use in U.S. waters, on the "alpha" channels.
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คำถามที่ 38/50
90:00
นาที
38
A DSC Safety call might be used under the following conditions:
A.
Navigation Hazard
B.
Man overboard
C.
Distress situation
D.
Serious medical request
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คำถามที่ 39/50
90:00
นาที
39
To send a Distress alert use the following procedure:
A.
Initiate a menu call to select Ch-16 for voice communications.
B.
Use the “Distress Hot Key” in an appropriate manner.
C.
Always insert the nature of the Distress first.
D.
Make a voice Mayday call on Ch-16 before any other action.
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คำถามที่ 40/50
90:00
นาที
40
A DSC Safety priority call might be used under the following circumstances:
A.
A crew member is missing and presumed lost overboard.
B.
There is a fire in the engine room.
C.
A lifeboat has been lost over the side in heavy weather and is adrift.
D.
A medical situation that did not present an imminent danger of loss of life.
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คำถามที่ 41/50
90:00
นาที
41
What would be the appropriate channel selection for follow-on voice communications for a Routine priority call to another vessel?
A.
Ch-70
B.
Ch-16
C.
Ch-22
D.
Ch-08
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คำถามที่ 42/50
90:00
นาที
42
If the vessel you wish to call is not listed in your VHF address book, what action would not resolve the problem?
A.
Look in the DSC Distress call data directory for the MMSI number of the other vessel.
B.
The vessel’s MMSI number could be manually entered during the call setup.
C.
The vessel’s name and MMSI number may be entered in the address book for use.
D.
Look the number up in the ITU books and manually call the vessel.
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คำถามที่ 43/50
90:00
นาที
43
What conditions must exist for a completely automatic DSC acknowledgement of a Routine call and change to suggested working channel?
A.
Both stations must be monitoring Ch-16 or the sending station must be set up for automatic DSC response.
B.
The receiving station must be monitoring the suggested working frequency.
C.
All routine priority DSC calls must be manually acknowledged by the watch officer.
D.
The receiving station must be set up for automatic DSC response.
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คำถามที่ 44/50
90:00
นาที
44
What precautions should be taken when reviewing previously transmitted messages?
A.
Press the “Call” key when finished.
B.
Always save the message.
C.
Take steps not to accidentally send the message again.
D.
No precautions are necessary.
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คำถามที่ 45/50
90:00
นาที
45
How many times is it possible to change your own MMSI number in a VHF unit?
A.
It is not possible.
B.
It may be changed by the operator up to 4 times.
C.
MMSI numbers can only be changed by the manufacturer.
D.
On some units it can be changed at will if the password is known.
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คำถามที่ 46/50
90:00
นาที
46
What precautions should be taken when reviewing received Distress messages?
A.
Take steps not to accidentally send a DSC acknowledgement or relay.
B.
Press the “Call” key when finished.
C.
Always save the message.
D.
No precautions are necessary.
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คำถามที่ 47/50
90:00
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47
Which of the following is not true regarding vessel position information?
A.
The position is normally provided from GPS input.
B.
The time of the updated position should be UTC or the correct local zone time.
C.
If the position is not automatically updated it must be manually updated every 4 hours.
D.
The position information must be periodically checked to ensure that it remains current and accurate.
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คำถามที่ 48/50
90:00
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48
The VHF-DSC self-test function (if available) usually performs the following:
A.
Transmits a very weak DSC signal which is picked up by the Ch-70 receiver.
B.
Transmits a weak voice signal which is picked up on Ch-16.
C.
Makes a diagnostic test of the system without actually transmitting a signal.
D.
Does a check sum of the memory chips.
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คำถามที่ 49/50
90:00
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49
What can the operator do to adjust the audible alarm?
A.
The operator can choose to disable the audible alarm.
B.
VHF DSC units only have visual alarms.
C.
The alarm cannot be disabled for Distress and Urgency messages.
D.
The audible alarm control has the same indication for all four message priorities.
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90:00
นาที
50
When initiating a DSC call through the menu system what is the most likely information that will be displayed after making the first correct keystroke?
A.
The Telecom-1 menu.
B.
The particulars of the previous call.
C.
The priority menu.
D.
The call setup menu.
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