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block

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

Select the correct answer(s).  

(0/0)

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NAVTEX

HF NBDP

Inmarsat

MF NBDP

none

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

Select the correct answer(s).  

(0/0)

---

Perform scheduled testing of the battery's charged condition.

Perform on-the-air verification checks.

Aligning the power output stage for maximum power.

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

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?

Select the correct answer(s).  

(0/0)

---

F1B/J2B SITOR (NBDP)

F3E FM Voice

G3E FM Voice

J3E SSB Voice

none

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

Select the correct answer(s).  

(0/0)

---

NAVTEX

HF SITOR (NBDP)

MF SITOR (NBDP)

Inmarsat

none

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

Select the correct answer(s).  

(0/0)

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Radiate omni-directionally.

Not function due to being grounded.

Radiate directionally due to being grounded

Only be used in Satellite communications.

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?

Select the correct answer(s).  

(0/0)

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Reserve source of energy

Ship's emergency diesel generator

Emergency power

Ship's standby generator

none

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

Select the correct answer(s).  

(0/0)

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

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

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

To ensure transmissions are restricted to legal marine frequencies.

none

Which of the following statements is true?

Select the correct answer(s).  

(0/0)

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There is only a single tone used in J2B mode.

There are two tones used in J2B mode.

An RF carrier is always required to carry the information

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...?

Select the correct answer(s).  

(0/0)

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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.

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

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

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.

none

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

Select the correct answer(s).  

(0/0)

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

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

Send a message to another ship terminal

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

none

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

Select the correct answer(s).  

(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

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

Select the correct answer(s).  

(0/0)

---

Thermal radiation

Chemical reactive radiation

X-radiation and gamma radiation

Radioactive radiation

none

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

Select the correct answer(s).  

(0/0)

---

Digital Selective Calling on channel 70.

VHF ARQ

Inmarsat

HF SITOR

none

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

Select the correct answer(s).  

(0/0)

---

It radiates more signal fore and aft.

It radiates a weak signal from the bow

It radiates equally well in all directions.

It radiates a strong signal vertically.

none

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

Select the correct answer(s).  

(0/0)

---

Go to muster station

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

Jump immediately from the ship

Wear life jacket