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block

What advantage does a vertical whip have over a long wire?

Pilih Jawapan yang Betul  

(0/0)

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It radiates more signal fore and aft.

It radiates equally well in all directions.

It radiates directionally for better propagation.

It radiates a strong signal vertically.

none

Which of the following systems is most likely to be subject to fading or static interference?

Pilih Jawapan yang Betul  

(0/0)

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Digital Selective Calling on channel 70.

Inmarsat

HF SITOR

VHF ARQ

none

Which of the following steps should be taken, if possible, when the vessel must be abandoned because of a distress situation?

Pilih Jawapan yang Betul  

(0/0)

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Jump immediately from the ship

Go to muster station

Place the SART and EPIRB in the “ON” position and secure them to the survival craft

Wear life jacket

none

Which of the following maintenance functions is not the responsibility of the GMDSS Radio Operator?

Pilih Jawapan yang Betul  

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Perform on-the-air verification checks.

Visual inspection of equipment, including the antenna and associated components.

Aligning the power output stage for maximum power.

Perform scheduled testing of the battery's charged condition.

none

Which of the following systems is least susceptible to atmospheric disturbances?

Pilih Jawapan yang Betul  

(0/0)

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Inmarsat

MF SITOR (NBDP)

HF SITOR (NBDP)

NAVTEX

none

In the event of failure of the main and emergency sources of electrical power – what is the term for the source required to supply the GMDSS console with power for conducting Distress and other radio-communications?

Pilih Jawapan yang Betul  

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Reserve source of energy

Ship's standby generator

Emergency power

Ship's emergency diesel generator

none

Which of the following statements is true?

Pilih Jawapan yang Betul  

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An RF carrier is always required to carry the information

There are two tones used in J2B mode.

There is only a single tone used in J2B mode.

There are a carrier and two sidebands in H3E mode.

none

As a preventive measures, the following rules to be obeyed during operation, control and emergency lighting service of the storage battery, except for...?

Pilih Jawapan yang Betul  

(0/0)

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The specific gravity of the electrolyte may be permanently increased due to ageing effects

After every complete discharge, the battery should be immediately charged before returning it to its regular floating service. Otherwise there may be a chance of deposition of sulphate film on the plates.

Do not allow the battery to stand idle for long time this may cause inactivation of the battery cells.

Do not charge the battery with very high rate of current because high rate of charging causes high temperature rise and excessive gassing resulting in heavy loss of water and sometime overflowing of electrolyte from the battery cells.

none

The best way to test the Inmarsat-C terminal is?

Pilih Jawapan yang Betul  

(0/0)

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Send a message to another ship terminal

Send a message to a shore terminal and wait for confirmation.

Compose and send a brief message to your own Inmarsat-C terminal.

If the “Send” light flashes, proper operation has been confirmed.

none

A vertical quarter wave antenna with a good ground connection will:

Pilih Jawapan yang Betul  

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Only be used in Satellite communications.

Radiate directionally due to being grounded

Not function due to being grounded.

Radiate omni-directionally.

none

Why is an antenna tuner required for MF-HF transmissions?

Pilih Jawapan yang Betul  

(0/0)

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To ensure transmissions are restricted to legal marine frequencies.

The antenna tuner indicates whether the ionosphere is ready to reflect a transmission properly

The antenna tuner calculates the proper spectrum band for the operator to use.

The length of the physically-fixed antenna must be electrically matched to the intended frequency of operation.

none

What advantage does a vertical whip have over a long wire?

Pilih Jawapan yang Betul  

(0/0)

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It radiates a weak signal from the bow

It radiates more signal fore and aft.

It radiates a strong signal vertically.

It radiates equally well in all directions.

none

Which system is least likely to be affected by atmospheric disturbances?

Pilih Jawapan yang Betul  

(0/0)

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MF NBDP

HF NBDP

Inmarsat

NAVTEX

none

What are the types of electromagnetic radiation with enough energy to ionize biological materials.

Pilih Jawapan yang Betul  

(0/0)

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Chemical reactive radiation

Thermal radiation

X-radiation and gamma radiation

Radioactive radiation

none

You look up a frequency table and all the listings end in either .0 or .5 kHz. What kind of emission is used with these frequencies?

Pilih Jawapan yang Betul  

(0/0)

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G3E FM Voice

J3E SSB Voice

F3E FM Voice

F1B/J2B SITOR (NBDP)