Aerated water can affect a Doppler log. Which one of the options is the most likely to produce aerated water?
Ваш ответ правильный:
The wake caused by the other ships propellers.
2
Select the option, which correctly completes the following statement: “If undisturbed reverberation measurement in shallow water is not possible, the system automatically switches to…”:
Ваш ответ правильный:
Bottom track.
3
Select from the options given six factors, that are likely to affect a Doppler log system:
Ваш ответ правильный:
Density differences in water.; Loss of signal or weak signal.; Aerated water.; Loss of bottom track.; Loss of water track.; Orientation of the transducer.
4
Which mode is the most suitable to use if the primary function of the connected ARPA is traffic surveillance?
Ваш ответ правильный:
Water track.
5
Which one of the following statement depends on the “Janus configuration”?
Ваш ответ правильный:
Small errors due to trim, roll and pitch.
6
Which one of the modes given in the options should be used when the Doppler log is connected to an ARPA-radar, which is primarily used for traffic surveillance (according to IMO-rules)?
Ваш ответ правильный:
Water track.
7
Which one of the modes given in the options should be used, when the Doppler log is connected to an autopilot with track keeping functions?
Ваш ответ правильный:
Bottom track.
8
Which one of the options identifies when the Doppler log would normally be switched off?
Ваш ответ правильный:
During dry-docking.
9
Which one of the options is the most likely reason, that a Doppler log’s operation might be disturbed during docking operations?
Ваш ответ правильный:
Due to aerated water from the backwash from own propeller.
10
Which one of the options is the type of measurement used by the Doppler log?