GMDSS. General. Test 21 – Online Maritime Tests

GMDSS: You have called a coast station by means of MF DSC to order a telephone call. There is no reply from the coast station. How long should you wait before you try to call again?

Not necessary to wait
5 minutes
1 minute
10 minutes

GMDSS: A quarter wave antenna is in resonance with the frequency 2346 kHz. What do we have to do with the antenna circuit to get the antenna in resonance with the frequency 3366 kHz?

Tune the antenna to make it electrically shorter.
It is not possible to make any changes to the antenna circuit.
Tune the antenna to make it electrically longer.
Do nothing, as 2346 and 3366 kHz are so called 'paired' frequencies.

GMDSS: You have received a 2 tone alarm signal on 2182 kHz. However, the signal ended with a 10 seconds prolonged tone. What station has transmitted the alarm signal?

A naval vessel in distress
Any vessel in distress
A coast station prior to transmitting Mayday Relay.
A coast guard vessel testing radio equipment.

GMDSS: You are going to sent a radio telex through Ostende Radio in Belgium. What publication would you use to find information about frequencies to utilize for the call?

List of Ship Stations
List of Coast Stations
Admiralty List of Radio Signals
List of Radio determination and Special Service Stations.

GMDSS: You want to transmit an Urgency call on MF DSC. On what frequency would you send the call, and on what frequency would you read the message?

Send call on 2177.0 kHz, read the message on 2182.0 kHz.
Send call on 2182.0 kHz, read the message on 2187.5 kHz.
Send call on 2187.5 kHz, read the message on e.g. 2057.0 kHz.
Send call on 2187.5 kHz, read the message on 2182 kHz.

GMDSS: Why does the SART (Search & Rescue Radar Transponder) scan from 9.2 to 9.5 GHz in the X band?

All 3 cm radars are unstable in such a way that they transmit on different frequencies.
All 3 cm radars are preprogrammed to transmit on a specially allotted frequency within the X band.
All 3 cm radars are equipped with a magnetron which, due to normal wear and tear, means that the radar transmits randomly in the X band.
Because 3 cm radars receive on 9.2 and 9.5 GHz only.

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