NBTC ONE STOP SERVICE

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

With most Inmarsat-C systems what should the indicator lamps do when powering up?

A. All lamps should illuminate in a particular sequence, as per the operator’s manual.

B. The power on lamp should illuminate. Other lights remain off until a message is received.

C. All lamps should light and stay illuminated.

D. All lamps should light except the RED light.

คำถามที่ 2/50

90:00 นาที

On an Inmarsat-C system an incoming EGC alarm sounds:

A. When first powered on and when receiving Distress traffic.

B. When receiving Distress traffic and all of the BALD MSI messages.

C. To draw the operator’s attention to an unscheduled Distress or Urgency message.

D. To indicate the loss of NCS CC sync -- preventing the reception of unscheduled EGC messages.

คำถามที่ 3/50

90:00 นาที

What action should be taken on changing from one ocean region to another?

A. Power the system down and turn the power back on again.

B. Manually realign the antenna.

C. Log out of the current satellite and log in to the correct satellite.

D. No action is required -- the unit will scan for another satellite and log in.

คำถามที่ 4/50

90:00 นาที

Which of the following is not an example of a failure to log-out properly?

A. Turning off the power prior to logging out with the NCS.

B. A message on the screen or printer from the NCS.

C. Sailing the vessel into a shadowing or local RF interference situation before logging out.

D. Sailing out of the footprint of a satellite before logging out.

คำถามที่ 5/50

90:00 นาที

How is maximum coverage provided by satellites in the maritime satellite service?

A. Four satellites in polar orbit.

B. Four satellites in geo-stationary orbit for each Inmarsat Service (B, C, F77 and M).

C. Four satellites in geo-stationary orbit approximately 22,184 miles above the equator.

D. Through coordinated use of COSPAS-SARSAT satellites.

คำถามที่ 6/50

90:00 นาที

What is meant by the characters GA+ on an Inmarsat terminal?

A. Go ahead for store & forward telex operations.

B. The instruction to "give address".

C. Go ahead for live telex operations.

D. General Address (to all stations).

คำถามที่ 7/50

90:00 นาที

What is the purpose of a CODEC?

A. Noise and echo-canceling used in TELEX operation.

B. To enable Distress communications.

C. To enable data communications.

D. To convert analog voice signals to digital transmissions.

คำถามที่ 8/50

90:00 นาที

The Inmarsat telephone and TELEX communications channel usage scheme is:

A. One ship per telephone channel and many ships per TELEX channel.

B. Many ships on the same TELEX analog channel and many ships on the same TDM telephone channel.

C. One ship per analog telephone channel and one ship per TELEX analog channel frequency.

D. One ship per channel whether telephone or TELEX.

คำถามที่ 9/50

90:00 นาที

What is the effect of having five periods (e.g. .....) in the text of a TELEX transmission on an Inmarsat-B SES?

A. The transmission will automatically terminate after those characters are transmitted.

B. Only the first period will be routed to the receiving party.

C. Only the first two periods will be routed to the receiving party.

D. This will automatically trigger the reversal of charges to the receiving party.

คำถามที่ 10/50

90:00 นาที

Which of the following modes of communications are available when using Inmarsat-C?

A. Fax reception

B. TELEX and e-mail

C. 14400 BPS Data

D. Voice transmissions

คำถามที่ 11/50

90:00 นาที

When Inmarsat-B and Inmarsat-C terminals are compared:

A. Inmarsat-B antennas are larger, but omni-directional, while Inmarsat-C antennas are smaller and parabolic, for aiming at the satellite.

B. Inmarsat-B antennas are parabolic and smaller for higher gain, while Inmarsat-C antennas are larger but omni-directional.

C. Inmarsat-C antennas are smaller, but omni-directional, while Inmarsat-B antennas are parabolic for lower gain.

D. Inmarsat-B antennas are larger, but directional for higher gain, while Inmarsat-C antennas are smaller and non-parabolic, and do not require aiming at the satellite.

คำถามที่ 12/50

90:00 นาที

Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?

A. Inmarsat-B terminals require AZ/EL setup and gyro input, in order to enable automatic satellite tracking.

B. Inmarsat-B terminals require gyro and GPS input, in order to enable automatic satellite tracking.

C. Inmarsat-C terminals require only GPS input, in order to enable automatic satellite tracking.

D. Inmarsat-C terminals require AZ/EL setup and GPS input, in order to enable automatic satellite tracking.

คำถามที่ 13/50

90:00 นาที

When Inmarsat-B and Inmarsat-C terminals are compared:

A. Inmarsat-C antennas are smaller, with active parabolic antennas but no rewind capability.

B. Inmarsat-C antennas are smaller, with passive non-parabolic antennas but no rewind capability.

C. Inmarsat-B antennas are larger, with passive non-parabolic antennas that require rewind capability.

D. Inmarsat-B antennas are larger, with stationary parabolic antennas but no rewind capability.

คำถามที่ 14/50

90:00 นาที

Which statement concerning Inmarsat-B and Inmarsat-C terminals is correct?

A. Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects due to their omni-directional antennas.

B. Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, but Inmarsat-B units have directional antennas.

C. Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, but Inmarsat-C units have directional antennas.

D. Both Inmarsat-B and Inmarsat-C units are subject to shadowing effects, due to their directional antennas.

คำถามที่ 15/50

90:00 นาที

Which Inmarsat Earth Stations could a vessel utilize for Inmarsat-B traffic if operating off the Pacific Coast of the United States and tracking the POR satellite?

A. Lakhdaria (Algeria), Yamaguchi (Japan) or Sentosa (Singapore).

B. Southbury (USA), Burum (Netherlands), EIK (Norway).

C. Kumsan (South Korea), Burum (Netherlands), or Nakhoda (Russia).

D. Santa Paula (USA), Auckland (New Zealand) or Yamaguchi (Japan).

คำถามที่ 16/50

90:00 นาที

Which of the following would be a valid sequence to request an automatically dialed ship-ship call to an F77 terminal on a vessel tracking the IOR satellite?

A. 00583430662888#

B. 00870430662888#

C. 00583763240864#

D. 00870763240864#

คำถามที่ 17/50

90:00 นาที

Which of the following is a correct dialing sequence for a vessel tracking the AOR-W satellite to send a FAX to a U.S. destination via Southbury LES -- using an Inmarsat-B terminal and charging it to a credit card?

A. 003# 1112125365110#

B. 001# 3615036943254#

C. 001+ 110243674932+

D. 001# 0015036684376#

คำถามที่ 18/50

90:00 นาที

What keyboard entry would you make on an Inmarsat-B terminal for an automatic TELEX connection to 882419 in Nebraska, USA (TELEX country code 230)?

A. 11230882419+

B. 00230882419#

C. 00230882419+

D. 230882419

คำถามที่ 19/50

90:00 นาที

Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a fax machine number 516-229-4339 in Long Beach, CA, U.S.?

A. 015162294339#

B. 15162294339

C. 015162294339

D. 1 516-229-4339

คำถามที่ 20/50

90:00 นาที

How would a notification of arrival be sent as a text to a mobile phone number using an Inmarsat-C unit?

A. Mobile phone numbers cannot be reached by Inmarsat-C terminals because they lack voice capability.

B. Use the Inmarsat-C voice handset to compose and transmit the text.

C. Compose a text file, use the SEND/REC or TRANSMIT menu & specify the recipient using the address book function (or by manual entry) for SMS destinations.

D. The mobile phone number is inserted as the first line of the text file and sent with the SEND/REC or TRANSMIT menu.

คำถามที่ 21/50

90:00 นาที

How may Inmarsat-C terminals be used for sending Urgency or Safety priority communications (such as synoptic weather reports)?

A. Urgency & Safety EGC messages can only be received by an Inmarsat-C terminal.

B. Enter PAN PAN or SECURITE into the heading of the message file so the message will be routed by priority.

C. Only Routine or Distress priority messages can be sent from an Inmarsat-C terminal.

D. Use the appropriate special 2-digit codes selected from the address book or manually enter the correct code into the SEND/REC or TRANSMIT menu.

คำถามที่ 22/50

90:00 นาที

In what way(s) may a Distress message be initiated through Inmarsat?

A. By transmitting the Distress message on the U.S. Coast Guard's dedicated monitoring channel.

B. By adding the word "Distress" in the first line of the message's preamble.

C. All Inmarsat units must use a dedicated key that can be pressed for immediate action.

D. By pressing dedicated key(s) for this purpose or using menu-driven features to produce a Distress priority message.

คำถามที่ 23/50

90:00 นาที

What actions should be taken to transmit a detailed satellite Distress message to a RCC handling your vessel’s initial “hot-key” Distress Alert?

A. Compose a detailed Distress message, attach it to the Distress Alert Setup menu and re-transmit the “hot-key” Distress Alert.

B. Call up and edit a pre-saved detailed Distress message, select the closest LES and press the “hot-key.”

C. Compose a detailed Distress message, use the Transmit or SEND/REC menu and send it to both the RCC and to your company emergency contact number.

D. Call up and edit a pre-saved detailed Distress message, use the Transmit or SEND/REC menu, select Distress priority and choose the best LES for the situation.

คำถามที่ 24/50

90:00 นาที

A vessel, before transiting the Panama Canal, on a voyage from San Diego to Miami, loses the ability to communicate via Inmarsat. The most likely cause is:

A. The vessel has sailed beyond the coverage area of the Pacific satellite.

B. The vessel has sailed beyond the coverage area of the Southbury Shore Station.

C. The vessel has sailed beyond the coverage area of the Western Atlantic satellite.

D. The satellite orbit is beyond the usable range of the SES.

คำถามที่ 25/50

90:00 นาที

Which functions may the holder of a GMDSS Radio Operator License NOT perform on the Inmarsat-C equipment?

A. Maintain the antenna clear of soot, paint, etc.

B. Log-on, traffic and log-off functions.

C. Entry of position data and selection of LES.

D. Optimize performance by adjusting the transmitter EIRP.

คำถามที่ 26/50

90:00 นาที

MF/HF Transceiver Power levels should be set:

A. To the highest possible level to ensure effective communications.

B. To the lowest possible level at all times regardless of whether communications are effective.

C. To the lowest level needed to achieve the necessary propagation radius and communications range.

D. To the highest level possible so as to ensure other stations cannot "break-in" on the channel during use.

คำถามที่ 27/50

90:00 นาที

An ITU duplex channel frequency is defined as:

A. Transmit and receive frequencies may be identical if communications are ship-shore.

B. Transmit and receive frequencies must be different.

C. Transmit and receive frequencies must be identical.

D. Transmit and receive frequencies may be different if communications are ship-ship.

คำถามที่ 28/50

90:00 นาที

ITU Duplex channels are:

A. Frequency assignments specific to U.S. vessels only.

B. VHF-FM frequencies.

C. International Traffic Utility frequencies.

D. Internationally standardized assignments of frequency pairs for common use.

คำถามที่ 29/50

90:00 นาที

Which statement regarding channel spacing and bandwidth is true?

A. Both TELEX bandwidth and channel spacing values are less than voice bandwidth and channel spacing values.

B. Voice bandwidth is greater than TELEX bandwidth and therefore voice channel spacing values are less than TELEX channel spacing values.

C. TELEX bandwidth is greater than voice bandwidth and therefore TELEX channel spacing values are less than voice channel spacing values.

D. Both TELEX bandwidth and channel spacing values are greater than voice bandwidth and channel spacing values.

คำถามที่ 30/50

90:00 นาที

Communications with an emission of F1B/J2B would typically have a channel spacing of:

A. 0.3 kHz

B. 0.5 kHz

C. 2.8 kHz

D. 3.0 kHz

คำถามที่ 31/50

90:00 นาที

For RF communications, "bandwidth" is best defined as:

A. The modulation technique required to insure proper ITU channel spacing.

B. The emission designation resulting from the desired modulation technique.

C. The portion of the radio spectrum consumed by a particular emission selection and modulation technique.

D. The portion of the radio spectrum reserved for frequency allocations by the ITU.

คำถามที่ 32/50

90:00 นาที

How are high seas (HF) radiotelephone communications initially established between a vessel and a public correspondence station?

A. The vessel listens for "free signals" and calls the public correspondence station on the SITOR (NBDP) calling channel with the strongest marker signal.

B. The vessel calls and establishes voice contact with the public correspondence station on a channel that the station is known to monitor, and the two stations then proceed with their business.

C. The vessel calls the public correspondence station on VHF Channel 16, and the two stations then switch to the working channel.

D. Public Correspondence Stations operate SITOR (NBDP) only.

คำถามที่ 33/50

90:00 นาที

What is the correct procedure for calling a coast radio station using HF radiotelephone?

A. On a properly selected ITU channel, give the name of the coast radio station being called three times, and the words "this is" followed by the name of the ship initiating the call three times, and ending with "over".

B. Contact the nearest U.S.C.G. station to add the desired ship's call sign to the station's traffic list.

C. Request the VTS operator place the call on channel 22A.

D. On a correct ITU channel, give the call sign of the coast radio station three times using phonetics, the words "this is", followed by the ship’s call sign three times using phonetics and ending with "over".

คำถามที่ 34/50

90:00 นาที

A Distress Priority DSC call may be formatted and transmitted specifying and requesting:

A. Nature of Distress, vessel position, follow-on frequency, only voice follow-on communications.

B. Nature of Distress or alternate frequency but not both in a single call, vessel position or alternate frequency/emission but not both in a single call, voice or TELEX follow-up communications.

C. Nature of Distress or alternate frequency but not both in a single call, vessel position or alternate frequency/emission but not both in a single call, only TELEX follow-up communications

D. Nature of Distress, vessel position, follow-on frequency, only TELEX follow-on communications.

คำถามที่ 35/50

90:00 นาที

To make a call to another vessel requesting TELEX communications regarding important company business, the GMDSS operator should:

A. Select Urgency priority, enter other vessel's MMSI, specify legal alternate frequency, F1B emission and transmit the properly formatted DSC call.

B. Select Routine priority, enter own vessel's MMSI, specify legal alternate frequency, F1B emission and transmit the properly formatted DSC call.

C. Select Routine priority, enter other vessel's SELCAL for TELEX specify legal alternate frequency, F1B emission and transmit the properly formatted DSC call.

D. Select Routine priority, enter other vessel's MMSI, specify legal alternate frequency, F1B emission and transmit the properly formatted DSC call.

คำถามที่ 36/50

90:00 นาที

A Coast Station that is described as ATOR typically provides what type of services?

A. NAVTEX BFEC weather broadcasts.

B. ARQ SITOR (NBDP) connections to shoreside terminals.

C. BFEC SITOR (NBDP) connections to shoreside terminals.

D. SITOR (NBDP) HF weather broadcasts.

คำถามที่ 37/50

90:00 นาที

What does the term "ARQ" mean in SITOR (NBDP) operations?

A. Automation Repeat Request

B. Automaton Repeat Request

C. Automatic Repeat Request

D. Automatic Request Repeat

คำถามที่ 38/50

90:00 นาที

"SITOR (NBDP)" communications are based on a digital code system:

A. Consisting of 7 bits, with four zeros and three ones.

B. Consisting of 7 bits, with four ones and three zeroes.

C. Consisting of 5 bits TELEX and 8 bits Fax.

D. Consisting of 5 bits for ship stations and 7 bits for shore stations.

คำถามที่ 39/50

90:00 นาที

For ARQ communications with a Public Correspondence Coast Station, which sequence of events best describes reaching the point in time where the text of TELEX communications should be sent.

A. Transceiver setup, SELCAL selection, Initiate Call, wait for exchange of answer-backs (WRU-AAB), OPR+, operator entry of the appropriate automatic TELEX code.

B. Transceiver setup, wait for exchange of answer-backs (WRU-AAB), OPR+, operator entry of the appropriate automatic TELEX code.

C. Transceiver setup, SELCAL selection, Initiate Call, wait for exchange of answer-backs (WRU-AAB), GA+?, enter DIRTLX xy+, MOM, MSG+? and exchange of terminal answerbacks.

D. Transceiver setup, wait for exchange of answer-backs (WRU-AAB), GA+? and then send message text.

คำถามที่ 40/50

90:00 นาที

During ARQ communications, which of these is least likely to cause a coast station to immediately break the phased radio connection:

A. If the automatic exchange of answerbacks is interrupted by keyboard entries.

B. If the error percentage of repeat requests becomes too high.

C. If the operator enters "KKKK" at the end of the message.

D. If the BRK+? Command is transmitted after time and charges are received.

คำถามที่ 41/50

90:00 นาที

What statement is true regarding the exchange between two parties engaged in SITOR (NBDP) communications?

A. In ARQ, each character is transmitted twice, with the second displaced in time from the first.

B. In ARQ, the "sending" station transmits a block of three characters and the "receiving" station responds with a one character Repeat Request. Following this the "transmitting" station will send a new block.

C. In ARQ, the ISS transmits a block of 3 characters and the IRS checks for parity. If the received block is correct a one-character control signal is sent notifying the ISS to proceed with the next block. If the parity check fails the block must be resent.

D. Broadcasts of Maritime Safety Information, traffic lists, etc. can be copied by the receiving station in ARQ mode.

คำถามที่ 42/50

90:00 นาที

When requesting a direct TELEX connection to a vessel's Inmarsat-B terminal, (i.e. making a SITOR (NBDP) call to an Inmarsat-B unit) the GMDSS operator must:

A. DIRTLX, 0, Ocean Area Code, TELEX number, +.

B. DIRTLX, 00, Ocean Area Code, TELEX number, +.

C. DIRTLX, 0, Country code, TELEX number, +.

D. DIRTLX, 00, Country code, TELEX number.

คำถามที่ 43/50

90:00 นาที

Which statement concerning frequency band selection and propagation most corresponds with standard practice.

A. Maximum Usable Frequency (MUF) and Optimum Usable Frequency (OUF) should be calculated prior to setting up the transceiver.

B. Propagation rules, Sunspot cycle status and seasonal variations (winter & summer) must always be employed to calculate the proper band selection.

C. Propagation "rules of thumb" should be combined with Solar flare alerts to determine band selection.

D. Propagation "rules of thumb" are usually sufficient for routine operations.

คำถามที่ 44/50

90:00 นาที

A ship at anchor has been communicating with a shore station approximately 200 miles distant on a frequency in the 4 MHz band through mid-morning. Toward the late afternoon and evening, what effect should be noticed?

A. Communications should be maintained with slight improvement in the signal received from the shore station.

B. Communications should gradually improve and peak at night and early morning.

C. Communications should slowly deteriorate but may be continued throughout the night.

D. Communications should gradually deteriorate and become impossible on this frequency by night.

คำถามที่ 45/50

90:00 นาที

How can a GMDSS operator determine the best frequency band to choose for a SITOR (NBDP) transmission to a shore station?

A. By consulting propagation tables.

B. Listen to shore station "free signals" and choose the band with the strongest signal.

C. If static interference is present, try lower bands first.

D. During nighttime, choose higher frequencies. Choose lower frequencies in the daytime.

คำถามที่ 46/50

90:00 นาที

A DSC Distress call is received by your vessel and your transceiver frequency display reads: Transmit = 4207.5 kHz and Receive = 4207.5 kHz with J3E emission -- what information can you infer from this?

A. The DSC call requested voice on 4207.5 kHz simplex but the requested alternate frequency is improper.

B. The DSC controller decoded the requested voice frequency as 4207.5 kHz simplex and your DSC controller has automatically set-up your transceiver and therefore the requested alternate frequency is correct.

C. The DSC call came in on 4 MHz DSC. You should set-up your transmitter and respond on the appropriate voice follow-on frequency of 4177.5 kHz.

D. The DSC call came in on 4 MHz DSC. You should set-up your transmitter and respond on the appropriate voice follow-on frequency of 4207.5 kHz.

คำถามที่ 47/50

90:00 นาที

What are potential dangers of automatic transceiver switching in response to a DSC call?

A. Incorrectly formatted DSC calls from other vessels result in a warning in the DSC alarm screen but the vessel still might be switched to an illegal or improper outcome.

B. The transceiver may be switched out of the marine bands or the frequency may not match the requested priority or emission.

C. The automatic transceiver switching software always detects improper priorities, emissions & frequencies to ensure there is no danger.

D. The automatic transceiver switching feature always interrupting safe navigation of your own vessel and placing the unit on the GMDSS Distress, Urgency or Safety follow-on frequencies.

คำถามที่ 48/50

90:00 นาที

What will cause an individual battery cell to reverse polarity.

A. High discharge rates without allowing for a cool down period.

B. When discharging the battery string if a cell becomes weaker than the remaining cells, the discharge current will effectively charge the weaker cell in reverse polarity.

C. Insufficient charging which does not bring all of the cells up to full charge.

D. The charging circuits are connected in the correct polarity but all of the cells are equally charged.

คำถามที่ 49/50

90:00 นาที

What is the effect of temperature on the specific gravity of lead acid batteries?

A. Higher temperature results in a higher specific gravity reading.

B. Higher temperature results in a lower specific gravity reading.

C. Temperature has no effect on the specific gravity reading.

D. Lower temperature results in a lower specific gravity reading.

คำถามที่ 50/50

90:00 นาที

What would be an indication of a malfunction on a GMDSS station with a 24 VDC battery system?

A. All of these symptoms would indicate a potential battery charger malfunction.

B. After testing the station on battery power, a voltmeter reading of 30 volts for a brief period followed by a steady 26 volt reading.

C. A constant 30 volt reading on the GMDSS console voltmeter.

D. After testing the station on battery power, the ammeter reading indicates a high rate of charge that then declines.

คุณยังตอบคำถามไม่ครบ : 50 ข้อ จาก 50 ข้อ

(คลิกที่หมายเลขข้อที่ต้องการ เพื่อตอบคำถาม)

เข้าสู่ระบบ

เฉลย