記憶度
6問
17問
0問
0問
0問
アカウント登録して、解答結果を保存しよう
問題一覧
1
What speed is known when the rotating shaft frequency and the natural vibrating frequency become synchronized at a particular speed?
Critical speed
2
On board an accident happened. Urgent radio-medical advice is needed. Which category you choose?
safety
3
Can you name of the AM-signal ?
both amplitude and frequency of the carrier wave are variable
4
Regulations require that any tankship making a voyage of over a 48 hour duration must have certain tests conducted not more than 12 hours prior to leaving port. Meeting this requirement includes the testing of the ?
means of communication between the bridge and engine room
5
A radiotelegraph station shall be provided with .
direct access to the navigating bridge
6
You are making ship-to-shore telephone calls on VHF. You should use the ?
VHF-FM service
7
Underway on watch in the fireroom, the bridge reports white smoke coming from the stack. This would indicate ?
excessive excess air
8
The button or switch "dimmer" of a mariphone serves?
to regulate the transmitting power
9
What item is considered the equivalent of aircraft's black box?
VDR
10
Vessel with an EPIRB, you must check?
the working of the charger and check the loaded condition of the battery
11
Which of the following requirements regarding radio telephone stations do not correspond to present regulations?
While at sea the installation shall be maintained in a satisfactory condition
12
Which distress signal is required for a liferaft in ocean service and could be effectively used to attract the attention of aircraft at night?
Red flares
13
You are proceeding to a distress site where the survivors are in liferafts. Which action will assist in making your vessel more visible to the survivors?
Making smoke in daylight
14
How would you determined the wave length of a radio signal?
frequency
15
The wavelength of a radio-signal reflected against the F-layer may be ?
1.5 cm
16
The call sign of a vessel is meant to?
be able to identify oneself
17
What is the used of Automatic amplifier regulation ?
reduce distortion of weak incoming signals
18
The maritime radio system consisting of a series of coast stations transmitting coastal warnings is called?
NAVTEX
19
Pledge of secrecy applies?
only for those who want to send and/or receive a message
20
At what speed a radio-wave travels in the air ?
300.000 per kilometers per hour
21
The VHF-band is in the frequency range of ?
30 - 300 GHz
22
The transmitting power of the mariphone is adjusted by setting?
squelch
23
channel has been designated for on-scene communications in GMDSS?
16 and 2174.5
24
Where does a radio signals in the HF channels propagate mainly ?
through hops between the ionized layers and the earth
25
Which statement concerning locating signals in the GMDSS is false?
Locating signals are transmitted by survival craft VHF transceivers.
26
101. On which frequency are navigational and meteorological messages normally sent on the NAVTEX system?
518KHZ
27
With the use of INMARSAT and digital selective calling, distress alerts can be received ?
With the NAVTEX
28
What is the primary purpose for Digital Selective Calling (DSC)?
DSC is to be used for transmitting and receiving distress alerts to and from other ships or coast radio stations via radio.
29
What is the maximum range of a VHF radio-set from ship to ship at sea ?
200 Nautical Miles
30
The HF-band is in the frequency range of ?
3 - 30 GHz
31
The typical "daylight-frequencies" for long distance transmission are located in the ? Masters
8 or 12 MHz-band
32
Which visual distress signal is acceptable for daylight use only?
Hand-held orange smoke distress flare
33
The type-indication of the radio set is mentioned in ?
the equipment appendix
34
When the vessels steering wheel on the navigation bridge is turned, the difference existing between the position of the wheel and that of the rudder is known as ?
the error signal
35
Which one of the listed entries in the radio log for radiotelephone station do not correspond to present regulations? Entries in the radio log shall include.
the condition and results of tests of the main radiotelegraph installation
36
One wishes to have a telephone conversation with a person whose name is known. What type of call it is ?
a personal call
37
You receive via the 8 MHz a DCS distress alert. The received DCS message is however distorted. The MMSI as well as the position are illegible. After listening at the 8 MHz telephone distress frequency, nothing is heard. This is because ?
First an acknowledgement of a coastguard station must be received via the 8MHz
38
Which statement concerning satellite EPIRBs is true?
Once activated, these EPIRBs continuously send up a signal for use in identifying the vessel and for determining the position of the beacon
39
Which one of the listed requirements regarding radiotelephone auto alarm do not correspond to present regulations?
in presence of atmospheric or interfering signals automatically adjust itself
40
The VHF radiotelephone frequency for Channel 14 is ?
156.7 MHz
41
What is the content of table #1 of radiotelephony procedures?
Phonetic alphabets and figure spelling
42
Which of the following VHF marine frequencies have been set aside by the ITU for The international distress, safety and calling frequency?
16
43
Which EPIRB transmits a distress alert that is received and relayed by an INMARSAT satellite?
L-Band EPIRBs
44
The VHF radiotelephone frequency for Channel 13 is ?
156.65 MHz