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Worksheets6 gmdss part1
Total questions: 24
Worksheet time: 12mins
What is the responsibility of compulsory GMDSS vessels?
A. Every vessel must be able to perform communications functions essential for its own safety and the safety of
other vessels.
B. Vessels must transmit a DSC distress relay upon receipt of a DSC distress alert.
C. Only the vessels closest to a Distress incident must render assistance.
D. Vessels must immediately acknowledge all DSC distress alerts.
GMDSS is required for which of the following?
A. All vessels capable of international voyages.
B. SOLAS Convention ships of 300 gross tonnage or more.
C. Vessels operating outside of the range of VHF coast radio stations.
D. Coastal vessels of less than 300 gross tons.
What equipment is programmed to initiate transmission of Distress alerts and calls to individual stations?
A. NAVTEX
B. GPS
C. DSC Controller
D. DSC Scanning Watch Receiver
What is defined as the area within the radiotelephone coverage area of at least one VHF coast station in
which continuous DSC alerting is available as defined by the IMO regulation for GMDSS?
A. Ocean Area Regions AOR-E, AOR-W, POR or IOR
B. Sea Area A2
C. Sea Area A1
D. Coastal and Inland Waters
Which of the following are required GMDSS functions for vessels?
A. Transmit and receive locating signals, general communications and SAR communications.
B. Transmit and receive general communications, transmit Distress Alerts by at least one means, MSI.
C. Transmit and receive locating signals, send MSI to other ships via EGC, Bridge-to-Bridge communications.
D. Transmit and receive SAR communications, transmit Distress Alerts by at least one means, Bridge-to-Bridge
communications.
What is the equipment carriage requirement for survival craft under GMDSS?
A. At least three SCT units and two SARTs on every cargo ship between 300-500 gross tons and the same on
all passenger ships regardless of tonnage.
B. At least three SCT units and two SARTs on every passenger ship and cargo ships of 500 gross tons and
upwards.
C. At least two radar transponders must be carried on every cargo ship of 300-500 gross tons and two radar
transponders (one for each side) of every passenger ship regardless of tonnage.
D. All cargo vessels above 300 gross tons and every passenger ship regardless of tonnage must carry three
SCT units and two SARTs.
A ship operating in sea area A-1 must have the following provisions for maintenance:
A. Shore maintenance.
B. Duplication of equipment.
C. At Sea Maintenance.
D. Any one of these is sufficient.
What is the primary frequency range for terrestrial communications using skywave propagation?
A. 300-3,000 kHz
B. 30-300 MHz
C. 3-30 MHz
D. 10-30 MHz
Which system has the least effective radius of operation?
A. VHF DSC
B. HF SITOR (NBDP)
C. MF SITOR (NBDP)
D. NAVTEX
What is the emission designation for VHF-FM?
A. F3C
B. F3E
C. J2B
D. H3E
Which of the following statements is true?
A. An RF carrier is always required to carry the information.
B. There is only a single tone used in J2B mode.
C. There are a carrier and two sidebands in H3E mode.
D. There are two tones used in J2B mode.
Which mode occupies the least bandwidth?
A. H3E
B. A3E
C. J2B
D. F3E
What advantage does a vertical whip have over a long wire?
A. It radiates equally well in all directions.
B. It radiates directionally for better propagation.
C. It radiates a strong signal vertically.
D. It radiates more signal fore and aft.
Which emission mode occupies the most bandwidth?
A. J2B
B. F3E
C. J3E
D. F1B
How many SITOR (NBDP) signals can occupy the space of one voice signal?
A. 10
B. 6
C. 4
D. 2
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?
A. F1B/J2B SITOR (NBDP)
B. J3E SSB Voice
C. F3E FM Voice
D. G3E FM Voice
What is the channel spacing for authorized F1B/J2B frequencies?
A. 170 Hz
B. 300 Hz
C. 3.0 kHz
D. 500 Hz
What is the channel spacing for MF-HF voice frequencies?
A. 500 Hz
B. 2.8 kHz
C. 3.0 kHz
D. 3.5 kHz
A vertical (whip) antenna has a radiation pattern best described by?
A. A figure eight
B. A circle
C. A cardioid
D. An ellipse
Why is an antenna tuner required for MF-HF transmissions?
A. The antenna tuner calculates the proper spectrum band for the operator to use.
B. To ensure transmissions are restricted to legal marine frequencies.
C. The length of the physically-fixed antenna must be electrically matched to the intended frequency of
operation.
D. The antenna tuner indicates whether the ionosphere is ready to reflect a transmission properly.
A vertical quarter wave antenna with a good ground connection will:
A. Radiate directionally due to being grounded.
B. Not function due to being grounded.
C. Only be used in Satellite communications.
D. Radiate omni-directionally.
What is the most common type of antenna for GMDSS MF-HF?
A. Vertically polarized whip antenna
B. Horizontally polarized long wire antenna.
C. Horizontally polarized vertical whip antenna.
D. Satellite radome with vertical polarization.
What is the purpose or function of the antenna coupler?
A. Electrically matching the antenna system to the transmit frequency.
B. Changing the overall wavelength of the antenna system (in addition to the fixed length whip.)
C. Enabling maximum transmitted signal on the band chosen by the operator.
D. All of these answers are functions of the antenna coupler.
What advantage does a vertical whip have over a long wire?
A. It radiates equally well in all directions.
B. It radiates directionally for better propagation.
C. It radiates a strong signal vertically.
D. It radiates more signal fore and aft.
