NBTC ONE STOP SERVICE

แบบฝึกหัดพนักงานวิทยุคมนาคมประเภทจำกัดเขตเดินเรือทะเล(ROC)

แบบฝึกหัดพนักงานวิทยุสมัครเล่น

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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

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.

คำถามที่ 2/50

90:00 นาที

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.

คำถามที่ 3/50

90:00 นาที

Which of the following statements concerning COSPAS-SARSAT is false?

A. 406 MHz EPIRBs are units that are used as alerting devices.

B. Doppler frequency measurements provide more precise locations than GPIRB signals.

C. The Doppler frequency measurement concept is used to determine the EPIRB's location.

D. Satellites in a low-earth polar orbit detect EPIRB beacons on 406 MHz and relay the information to a Local User Terminal (LUT).

คำถามที่ 4/50

90:00 นาที

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.

คำถามที่ 5/50

90:00 นาที

What may be used as a homing signal by the search and rescue vessels in the immediate vicinity of the ship in Distress?

A. Flare gun

B. Strobe Light

C. 406 MHz signal from a satellite EPIRB.

D. A 121.5 MHz emergency transmitter in a satellite EPIRB.

คำถามที่ 6/50

90:00 นาที

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

คำถามที่ 7/50

90:00 นาที

Equipment for radiotelephony use in survival craft stations under GMDSS must have what capability?

A. Operation on 457.525 MHz.

B. Operation on Ch-16.

C. Operation on 121.5 MHz.

D. Operation on Ch-70.

คำถามที่ 8/50

90:00 นาที

Equipment for radiotelephony use in survival craft stations under GMDSS must have what characteristic(s)?

A. Permanently-affixed antenna, watertight, power 1W or 25W.

B. Watertight, power a minimum of 1W, operation on CH-16, Ch-13 & Ch-70.

C. Operation on Ch-16, watertight, permanently-affixed antenna.

D. Operation on Ch-16, Ch-13 & Ch-70, power 1W, permanently-affixed antenna.

คำถามที่ 9/50

90:00 นาที

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.

คำถามที่ 10/50

90:00 นาที

Which statement is NOT true regarding the requirements of survival craft portable two-way VHF radiotelephone equipment?

A. Watertight to a depth of 1 meter for 5 minutes.

B. Operates simplex on Ch-70 and at least one other channel.

C. Effective radiated power should be a minimum of 0.25 Watts.

D. The antenna is fixed and non-removable.

คำถามที่ 11/50

90:00 นาที

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

คำถามที่ 12/50

90:00 นาที

On Scene communications are usually initiated using what equipment?

A. EPIRB on 121.5 MHz

B. SART on 9 GHz

C. VHF on Ch-16

D. VHF on Ch-70

คำถามที่ 13/50

90:00 นาที

Which statement is NOT true regarding the COSPAS-SARSAT system?

A. The position of the EPRIB is always transmitted in the outgoing transmission (unless the unit is a GPIRB).

B. Signals received by low altitude, near-polar orbiting satellites are relayed to a ground receiving station (LUT).

C. Doppler shift is used to locate the position of the EPIRB.

D. EPIRBs are satellite beacons used as alerting & homing devices.

คำถามที่ 14/50

90:00 นาที

Which statement is NOT true regarding an Inmarsat Distress Alert?

A. USCG coast stations will receive the alert and immediately notify the correct RCC.

B. The operator selection of LES will determine which associated RCC will receive the alert.

C. If the operator selects an invalid or inoperative LES code the NCS for that service will intercept the call and reroute the alert.

D. If the LES choice is not updated properly the Distress Alert might be routed to a non-optimum RCC, introducing delays and confusion into the Distress situation.

คำถามที่ 15/50

90:00 นาที

Which statement is true regarding Inmarsat “hot-key” Distress Alerts?

A. The LES programmed by the watch officers into the Distress Alert Update menu determines which RCC will receive your initial Distress Alert.

B. The vessel’s position is checked against the SAR jurisdictions and the proper LES updated as the vessel changes NAVAREAS.

C. The GPS position updates the Distress Alert Update menu to the correct LES choice to ensure proper communications with an RCC.

D. The Distress Alert defaults are set correctly by the manufacturer and then automatically updated.

คำถามที่ 16/50

90:00 นาที

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).

คำถามที่ 17/50

90:00 นาที

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.

คำถามที่ 18/50

90:00 นาที

What statement is true regarding the control the operator can exercise over the NAVTEX receiver's operation?

A. The operator can set the unit to automatically reject any and all categories of messages if the ship desires to not receive them.

B. Upon entering a coastal area for the first time, the operator enters code KK to indicate "ready to receive NAVTEX".

C. The operator can set most units to reject all messages except navigation, meteorological warnings, and search and rescue messages. If the unit will reject such messages it may be unsafe to do so.

D. To reduce the number of messages, the operator can select code 00 to indicate "not in coastal passage".

คำถามที่ 19/50

90:00 นาที

Which messages are mandatory to be received and should not typically be rejected or disabled by the operator of a NAVTEX receiver?

A. Meteorological warnings, SAR information, Pilot Service Messages.

B. Meteorological warnings, meteorological forecasts, navigational warnings.

C. SAR information, navigational warnings, ice reports.

D. Navigational warnings, meteorological warnings, SAR information.

คำถามที่ 20/50

90:00 นาที

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.

คำถามที่ 21/50

90:00 นาที

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.

คำถามที่ 22/50

90:00 นาที

What system can provide an automated service in coastal waters where it may not be feasible to establish the NAVTEX service or where shipping density is too low to warrant its implementation?

A. AMVER

B. VHF DSC

C. ARQ SITOR (NBDP)

D. SafetyNETTM

คำถามที่ 23/50

90:00 นาที

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.

คำถามที่ 24/50

90:00 นาที

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

คำถามที่ 25/50

90:00 นาที

Maritime Safety Information is promulgated via satellite through which system?

A. SafetyNETTM

B. AMVER

C. NAVTEX

D. Inmarsat-M SES

คำถามที่ 26/50

90:00 นาที

What information is promulgated by the international SafetyNETTM?

A. Traffic Lists

B. Priority Messages

C. MARAD

D. MSI

คำถามที่ 27/50

90:00 นาที

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.

คำถามที่ 28/50

90:00 นาที

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

คำถามที่ 29/50

90:00 นาที

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

คำถามที่ 30/50

90:00 นาที

What services are available through Enhanced Group Calls?

A. Maritime Safety Information and vessel traffic lists.

B. Hourly NOAA weather broadcasts from the NWS.

C. Maritime Safety Information and messages to pre-defined groups of subscribers.

D. Coastal weather broadcasts.

คำถามที่ 31/50

90:00 นาที

Setting the squelch control to just beyond the point where the background noise disappears results in:

A. Maximum sensitivity without background noise.

B. Reduced sensitivity without background noise.

C. Minimum background noise with reduced sensitivity.

D. Greater bandwidth without background noise.

คำถามที่ 32/50

90:00 นาที

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.

คำถามที่ 33/50

90:00 นาที

Proper and legal VHF operations require all of these except?

A. The channel must be designated as valid for the nature or type of communications desired.

B. Simplex, duplex and alpha channel modes must be correctly selected.

C. The correct bandwidth must be selected by the operator.

D. The power level must be appropriately chosen by the operator.

คำถามที่ 34/50

90:00 นาที

Describing VHF transmissions as "line of sight" does not mean:

A. Vessel antenna height will not affect the radius of propagation.

B. The normal transmission range to a coast station is approximately is 10 NM.

C. Coast station antenna height has no effect on the radius of transmission.

D. VHF communications are effective only with nearby stations within visual range of the bridge.

คำถามที่ 35/50

90:00 นาที

Which channel is utilized for the required Bridge-to-Bridge watch?

A. DSC on Ch-70

B. VHF-FM on Ch-13 in most areas of the continental United States.

C. VHF-FM on Ch-16

D. The vessel's VHF working frequency.

คำถามที่ 36/50

90:00 นาที

What channel is always being continuously monitored?

A. Ch-70

B. Ch-28

C. Ch-80

D. Ch-16

คำถามที่ 37/50

90:00 นาที

Which of the following channels may be used for duplex communications?

A. Ch-70

B. Ch-26

C. Ch-5A

D. Ch-22A

คำถามที่ 38/50

90:00 นาที

Which of the following statements is true?

A. You should always use the “INT” setting for calling a Public Correspondence station.

B. Using the “USA” setting changes certain channels from duplex to simplex operation.

C. You should use Ch-22 when calling the U. S. Coast Guard.

D. Using the “INT” setting will prevent proper Ch-13 Bridge-to-Bridge operations.

คำถามที่ 39/50

90:00 นาที

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.

คำถามที่ 40/50

90:00 นาที

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.

คำถามที่ 41/50

90:00 นาที

What would be the appropriate menu choice when calling another ship station?

A. Ch-28

B. Duplex

C. Simplex

D. Ch-22

คำถามที่ 42/50

90:00 นาที

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

คำถามที่ 43/50

90:00 นาที

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.

คำถามที่ 44/50

90:00 นาที

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.

คำถามที่ 45/50

90:00 นาที

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.

คำถามที่ 46/50

90:00 นาที

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.

คำถามที่ 47/50

90:00 นาที

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.

คำถามที่ 48/50

90:00 นาที

Which of the following statements is not true concerning the DSC call data directory?

A. All DSC units typically store all of the Transmitted and Received DSC calls in a single directory.

B. Some DSC units have both a Transmit and Receive message directory or database.

C. Some DSC units have different directories for received calls and sort them by priority.

D. Calls in the directory should not be deleted – they are necessary for inspections & logkeeping.

คำถามที่ 49/50

90:00 นาที

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.

คำถามที่ 50/50

90:00 นาที

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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