FREE GMDSS Radio Operator Questions and Answers

Question 1

What radio circuit samples analog signals, records and processes them as numbers, and then converts them back to analog signals?

Accepted Answer

The digital signal processing circuit.

Answer

The pre-emphasis audio stage.

Answer

The squelch gate circuit.

Answer

The voltage-controlled oscillator circuit.

Question 2

Which of the following statements about SSB voice transmissions is correct?

Accepted Answer

They normally use J3E emissions, which consist of one sideband and a suppressed carrier.

Answer

They use A3E emissions which are produced by modulating the final amplifier.

Answer

They use F3E emission which is produced by phase shifting the carrier.

Answer

They may use A1A emission to suppress the carrier.

Question 3

How does the COSPAS-SARSAT satellite system determine the position of a ship in distress?

Accepted Answer

By measuring the Doppler shift of the 406 MHz signal taken at several different points in its orbit.

Answer

The EPIRB always transmits its position which is relayed by the satellite to the Local User Terminal.

Answer

It takes two different satellites to establish an accurate position.

Answer

None of the above.

Question 4

Which of the following contains a multirange AF voltmeter calibrated in dB and a sharp, internal 1000 Hz bandstop filter, both used in conjunction with each other to perform quieting tests?

Accepted Answer

SINAD meter

Answer

Reflectometer

Answer

Dip meter

Answer

Vector-impedance meter

Question 5

When sending a DSC call:

Accepted Answer

Vessel's position will automatically be sent if the vessel is sending a "Distress Hot Key" alert.

Answer

Vessel's position will automatically be sent.

Answer

Vessel's MMSI will indicate its ocean region.

Answer

None of the above

Question 6

You send a VHF-DSC Distress alert. What channel do you use for the follow-on voice transmission?

Accepted Answer

Ch-16

Answer

Ch-12

Answer

Ch-70

Answer

Ch-13

Question 7

The U.S. Country Code for voice transmission is:

Accepted Answer

1

Answer

011

Answer

001 for Southbury, 201 Santa Paula

Answer

581 for AOR-E, 582 for POR and 584 for AOR-W

Question 8

Which of the following two-way communications can be made through Inmarsat without charge?

Accepted Answer

Distress traffic

Answer

A service message that advises a vessel of other ship traffic in its vicinity.

Answer

SafetyNETTM

Answer

Vessel position information when the ship's GPS fails.

Question 9

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

Accepted Answer

Aligning the power output stage for maximum power.

Answer

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

Answer

Perform on-the-air verification checks.

Answer

Perform scheduled testing of the battery's charged condition.

Question 10

Which of the following message categories cannot be disabled by the GMDSS Radio Operator?

Accepted Answer

All of the above

Answer

Navigational warnings

Answer

Meteorological warnings

Answer

Search and Rescue information