Тест состоит из 80 случайных вопросов.
Всего вопросов по данной теме: 198
On board one can use the reflections in the ionosphere by the right choice of:
The length of the aerial.
The time of transmission.
The mode of transmission.
The Satellite orbit in the Cospas-Sarsat system is:
By FleetNET communication is understood:
An urgent message for all ships in a particular area.
A MSI-message destined for ships in specific geographical area.
A HF-NBDP-message destined for ships in a certain geographical area.
An EGC-message destined for ships with the same group call number.
The following information must be given on the SART:
The name of the operator.
Date of replacement of the batteries.
The date of replacement of the hydrostatic release unit.
In maritime communication two international treaties are primarily involved. They are:
SOLAS and the international treaty for messaging.
The IMO at London and the ITU at Geneva.
GMDSS hand book and MERSAR.
What is the first function of GMDSS?
Transmission and reception of on scene communication.
Transmission of ship to shore alerts.
Reception of shore to ship distress alerts.
Transmission and reception of signals for locating.
With an EPIRB:
You must check the working of the charger and check the loaded condition of the battery.
You must check the date the battery must be replaced.
You must check the manufacturer of the battery.
You must check if it is attached properly to a railing with the required line.
The display of the DSC-controller on board is showing the following lines: RX: 002442000; CH87; D Sellcall Routine. We’re asked to listen on:
Channel Delta of the coast station.
Radio telephony-channel 7 in the 8 MHz band.
What is the acronym FR 01?
The exact position of a 406 MHz COSPAS SARSAT EPIRB is eventually calculated by:
In the Inmarsat Maritime Communications Handbook one can find information about:
2 digit code telex services.
Numbers of fax subscribers.
What mode must be used on the MF/HF transmission when making a radiotelephone call?
What information has to be given to set up a radio telex-connection with a coast-station:
Telex number of the coast station.
FEC followed by the telex country-code of the coast-station.
ARQ followed by the call sign of the coast station.
ARQ followed by the coast-station’s ID-number.
The wavelength of a radio-signal reflected against the F-layer may be:
On area A1 the function “Reception of shore to ship distress alerts” is mainly based on:
The use of SART transponders.
The use of SARSAT COSPAS Epirbs.
Under GMDSS rules the trading area A1 can be considered to be:
Within range of VHF coast radio stations.
Within the coverage of Inmarsat.
Within range of MF coast radio stations.
What is the meaning of the abbreviation “RQ” at the end of a DSC sequence?
Acknowledgement broadcast.
DSC uses for automatic identification the MMSI. The identification 002442000 is assigned to:
A coast-station or coast guard-station.
Onboard the following message is received on the DSC controller: DOO: 245329000 CH16; S distress ack 244123000. What station sent the distress acknowledgement?
The frequency 121,5 MHz is used for:
A wire aerial for an MF/HF-transmitter must be suspended between isolators:
To prevent contact with earth.
To prevent burns when touching the aerial.
To make the way for aerial currents as long as possible.
According to the rules of GMDSS all vessels have to be equipped with:
A possibility to receive MSI.
At least three mariphones.
What are the NAVTEX messages categories which cannot be suppressed?
The impedance of a coax cable for the VHF-set depends on:
The structure dimensions and the material of the coax cable.
The length of the coax cable.
The temperature of the cable.
The way in which the feed line is controlled.
What do you understand by the initials EPIRB?
This means: Emergency Plotting Indicator Response Beacon.
This means: Emergency Position Indicating Radio Beacon.
This means: Emergency Personal Indicator Rescue Beacon.
This means: Emergency Plotting Indicator Rescue Beacon.
The ideal aerial length depends on:
The modulation form chosen.
The class of transmission.
Reflection of radio waves in the ionosphere depends on:
The propagation speed of propagation.
The chosen mode of transmission.
The authority to order the use of distress signal or distress alerts is:
The first person to discover the distress situation.
The person designated to maintain communication during distress situations.
The MF/HF-transceiver on board is tuned to the assigned frequency of a station. To make this connection the following mode is used:
Automatic amplifier regulation is used for the following reasons:
With strong incoming signals distortion is reduced.
With weak incoming signals distortion is reduced.
With bad weather the signal is amplified.
With absence of incoming signals noise is reduced.
The propagation of radio-signals in the VHF-band is:
Dependent on the hour of transmission (day or night).
Dependent on the power emmited and the temperature of the atmosphere.
The safety message announces that a station:
Is going to be under repairs.
Is in serious and imminent danger and needs immediate assistance.
Will relay a message concerning an important navigational or meteorological warning.
Has an very urgent message concerning the safety of a vessel, a plane or another means of conveyance.
For a DSC-connection (no “distress alert”) with another vessel the following frequencies are used:
TX: 2 187,5 kHz RX: 2 187,5 kHz.
TX: 2 177,0 kHz RX: 2 177,0 kHz.
TX: 2 189,5 kHz RX: 2 189,5 kHz.
TX: 2 187,5 kHz RX: 2 182,0 kHz.
On the MF/HF transmitter-receiver there is a sensitivity control. Another name for this is:
The normal mode of operation for each coast station shall be indicated in:
The ITU List of Radiotermination and Special Services.
The ITU List of Ship Stations.
The ITU List of Call signs and numerical identities of station used by the maritime mobile and maritime mobile-satellite services.
The ITU List of Coast Station.
In what HF-band is long distance transmission possible when both stations are located in Darkness?
What HF-band is generally suitable for long distance transmission if one of two stations is Located in twilight?
The type of Inmarsat station A, B, C, M is recognized by:
The first four digits of the identification.
Last digit of the identification.
The first two digits of the identification.
The first digit of the identification.
What is the purpose of the radiotelephony two tone alarm?
Alert COSPAS/SARSAT satellites.
Activate bridge watchkeeping receivers and attract the attention of the person on watch.
Attract the attention of the person on watch.
Activate bridge watchkeeping receivers.
The number of oscillations of a wave per seconds is called:
A vessel is equipped for all sea areas. In the middle of the Indian Ocean the EGC-receiver appears out of order. Is it still possible to receive MSI-messages?
Yes, with the MF/HF-radio telex.
Which type of call will be sent by a ship adrift and needing the assistance of a tug? The weather is not bad and the ship will be aground 24 hours later.
Of the AM-signal:
Amplitude and frequency of the carrier wave are constant.
Both amplitude and frequency of the carrier wave are variable.
Is not dependent on the frequency and amplitude.
Amplitude is variable and frequency of the carrier wave is constant.
The squelch on the control panel of a VHF-sat serves to:
Adjust the receivers volume.
Adjust the proportion of atmospheric noise in receiving the spoken word.
Adjust the threshold level for admitting signals and refusing noise.
Adjust the sound level of the signal received.
According to the rules of GMDSS vessels one must be able to receive MSI with the aid of:
Emergency portable radio.
A DSC distress alert is received. The message states that communication by radiotelex is prefered. One preferably uses:
Your vessel is not in distress and not taking part in a distress operation. How would you impose radio silence on vessels which are interfering the distress traffic?
At the entrance to the space where batteries are stored on board the following notice must be fitted:
No entry with naked light and/or flame.
By reduced transmitting power is meant in VHF a power between:
To receive distress alerting and MSI via an Inmarsat-C set vessels must have:
A radio officer on board.
MF/HF radio telex scanner with printer.
Suitable for 518 kHz NAVTEX receiver.
Which wave length applies to a frequency of 2 000 kHz?
Inmarsat is short for:
International Maritime Satellite System.
International Maritime Satellite Organisation.
International Maritime Safety Organisation.
Internal Marine Safety Organisation.
An area within the radiotelephone coverage of at least one VHF coast station in which continuous DSC alerting is available is called:
The number of oscillations of a wave per seconds is called:
The word NAVTEX is spelled conform the international phonetic alphabet:
November, Apple, Victoria, Tango, Echo, X-mas.
November, Able, Valencia, Tripoli, Echo, Xantippe.
November, Alfa, Victor, Tango, Echo, X-ray.
November, Anna, Victor, Tango, Eduard, X-ray.
Which of the following frequency bands would most likely provide reliable communication between two stations that are 15 miles apart?
The Very High Frequency (VHF) band.
The Medium Frequency (MF) band.
The High Frequency (HF) band.
The Low Frequency (LF) band.
What is the most important factor influencing the HF range?
The power of the transmitter.
The word SATCOM is spelled conform the international phonetic alphabet:
Sierra, Anna, Tango, Cornelies, Oslo, Mike.
Sierra, Able, Tango, Cornelies, Oslo, Man.
Sierra, Able, Tripoli, Charlie, Oscar, Mike.
Sierra, Alfa, Tango, Charlie, Oscar, Mike.
How often must inspection of proper working of the EPIRB’s and SART’s take place on board? Once per:
By frequency is meant:
Time lapse of vibrations.
Number of vibrations per unit of time.
Define the class of emission H3E:
Radiotelex and DSC – Frequency shift keying of carrier with error correction.
Radiotelex and DSC – Frequency shift keying of sub-carrier with error correction.
Radiotelephony – Single sideband full carrier.
Radiotelephony – Frequency modulation.
An area within the radiotelephone coverage of at least one VHF coast station in which continuous DSC alerting is available is called:
According to the rules of GMDSS vessels equipped for all sea areas have to be provided with:
406,0 MHz Cospas-Sarsat EPIRB.
1,6 GHz Inmarsat/DSC EPIRB.
121,5/243,0 MHz VHF EPIRB.
A SART must be visible on the ship’s radar from a distance of at least:
At the end of a radio telex-connection, when a “store and forward” message has been transmitted, the coast-station at least gives a:
Time (in UTC) whereupon the telex for the subscriber is delivered.
Approximate time when telex will be delivered.
Code in letters which will be repeated when the telex has been delivered to the subscriber.
The prescribed periodic tests of the radio set must be entered in:
Manual maritime radio communication.
The word CHANNEL is spelled conform the international phonetic alphabet:
Charlie, Hotel, Able, November, November, Echo, Liverpool.
Cornelies, Hotel, Alfa, November, November, Echo, Lima.
Charlie, Hotel, Alfa, November, November, Echo, Lima.
Cornelies, Hotel, Apple, November, November, Echo, Land.
The batteries must be placed in a well ventilated place, so that:
The person can work in the compartment.
The detonating gas can be discharged.
The production of detonating gas can be prevented.
There is sufficient oxygen available for optimum working of the batteries.
Long distance communication in the HF-bands depends on:
According to the rule of GMDSS, channel 70 is used for:
Distress and urgency traffic.
On which frequency a ship must maintain a continuous watch when sailing in area A2?
You want to send a DSC-call in connection with a shore telephone-call. You must choose:
A VHF transmission range is mainly determined by:
The height of the aerial.
The transmission power, propagation and the quality of the receiver.
Whether it is radio-telephony, radio-telex or DSC.
According to the rules of GMDSS vessels are equipped with certain radio-communication devices depending on:
MF communication is usually provided by:
In the traffic list a coast-station indicates that there is a radio telex-message for a vessel. To call for the message one should put in:
After ga + the radio telex-command msg + ?
After ga + ? the radio telex-command msg +.
After ga + the radio telex-command msg +.
After ga + the telex number of the ship.
Command of radio-traffic between vessels and coast stations lies:
Always with the coast station.
With the station that calls.
On the MF/HF transmitter-receiver there is a sensitivity control. Another name for this is:
When sending an OBS (weather report) with Inmarsat one should use Service Code “41”. With this address the weather report will always be transmitted to:
The meteorological office of the ship’s flag state.
MET office Washington, this office will take care of further dispatch of the weather reports.
The meteorological station connected with the CES used.