Pass Benchmark: 75% • Standard: USCG NMC / 46 CFR

USCG GMDSS Element 7 (Radio Operating Practices) (Set 20)

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Question 1 of 30

The "short rules" of propagation necessary to select the appropriate frequency band are:

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30 MCQs

#1 The "short rules" of propagation necessary to select the appropriate frequency band are: #2 GMDSS operators should learn which of the following propagation "rules of thumb"? #3 What would be the most appropriate HF bands for communicating from San Francisco to Taiwan or the Philippines? #4 GMDSS operators should routinely focus on the factors affecting propagation in what priority? #5 Which statement concerning frequency band selection and propagation most corresponds with standard practice. #6 To ensure effective communications, GMDSS operators should: #7 A ship has been communicating effectively on 16 MHz during daylight hours with a shore station at a distance of 3500 miles. Toward late afternoon and evening what effect would be noticed? #8 A ship at anchor has been communicating marginally with a shore station approximately 200 miles distant on a frequency in the 4 MHz band periodically throughout the day. Toward the late afternoon and evening, what effect should be noticed? #9 At mid-day in the summer, what would be the best choice in attempting to communicate, using NBDP with a shore station some 1800 miles distant? #10 At mid-night, what would be the best choice in attempting to communicate, using NBDP with a shore station some 800 miles distant? #11 At mid-day, what would be the best choice in attempting to communicate with a shore station some 75 miles distant? #12 How can a GMDSS operator determine the best frequency band to choose for a SITOR transmission to a shore station? #13 The Distress Alarm sounds and the screen readout no longer contains the particulars of the Distress: #14 You receive an Urgency DSC call to all vessels specifying an alternate TELEX frequency & emission. If your transceiver frequency display reads: 2174.5 kHz transmit & 4207.5 kHz receive: #15 You receive a Routine DSC call specifying an alternate working voice frequency & emission. Your transceiver frequency display reads: 4125.0 kHz transmit 4125.0 kHz receive: #16 You receive a Routine DSC call to your vessel, without specifying an alternate working voice frequency & emission. Your transceiver frequency display reads: 2177 kHz transmit 2177 kHz receive. What must you do? #17 An incoming DSC Distress Alert on 8414.5 kHz will have what result? #18 What is the normal voltage of a single lead acid battery cell? #19 What is the normal specific gravity of a fully charged lead acid battery cell? #20 What instrument is used for measuring the electrolyte of a lead acid battery? #21 What will cause an individual battery cell to reverse polarity. #22 What is the effect of temperature on the specific gravity of lead acid batteries? #23 What would be an indication of a malfunction on a GMDSS station with a 24 VDC battery system? #24 Which of the following conditions would be a symptom of malfunction in a 2182 kHz radiotelephone system which must be reported to an onboard or at-sea maintainer under GMDSS? #25 Which would indicate a malfunction in a 2182 kHz radiotelephone system? #26 Which would indicate proper operation of a SSB transmitter rated at 60 Watt PEP output in J3E mode? #27 Which would be an indication of proper operation of a SSB transmitter rated at 60 watt PEP output? #28 Your antenna tuner becomes totally inoperative. What would you do to obtain operation on 2 HF bands? #29 Your MF-HF whip antenna breaks off and is carried away in a storm. What would you do to regain operation on MF-HF frequencies? #30 A DSC Distress call is received by your vessel and your transceiver frequency display reads: Transmit = 4207.5 kHz and Receive = 4207.5 kHz -- what information can you infer from this?

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