D. The range of the message extend and the quality of reception is improved 14. The DSC frequency for distress alerting in Area A2 is A. 2182KHZ B.2174.5KHZ C. 2192KHZ D 2187.5KHZ D A any appropriate channel except public communication B any appropriate channel except for public communication C any appropriate channel besides public communication D any appropriate channel beside public communication 16. why do some stations keep siler A. Because they are not engaged in the distress traffic B. they will affect the transmission of the distress traffic D. They are not in charge of search and rescue 17. General radio communications in the global system are those between concerning the management and operation of the ships and may have impact on their safety A. SAR party and the ship in distress B. SAR authorities and the ship in distress and survival craft C. A ship station and any coast station D Ship stations and shore-based communication network 18. It is required that ships proceeding at sea should keep continuous watch on B. Appropriate DSC distress and safety frequencies C INMARSAT TDM message channel D. VhF channel 70 and channel 8 19. The arQ mode should be applied A. when two stations communicate with each other B. in any radio system and at any time C. when one ship sends a message to another station D. for communication among some stations 20. What information will a distress alert contain A. nature of d C course and speed and time at which the information was recorded D.A.B. C are all right 21. A radio determination system based on the comparison of reference signals with radio signals reflected, or retransmitted from the position to be determined, is A DE B. Radar System C DSC Syste D COSPAS-SARSAT 22. With the help of modern technology, ships are able to receive automated broadcast of safety A. by day or at night B. almost round the clock D. from sunrise and sunset B 23. The WwNwS is a coordinated global service for the broadcast by radio of vital information to marine navigation A ship,s movement B. safety C. ship's management D 24. distress alerts will be relayed on the when the RCC considers it necessary A dedicated system B MSi broadcasts C. 518KHZ D channel 16 B 25. The frequency 518KHZ will be used to transmit warnings in NaVteX2 D. The range of the message extend and the quality of reception is improved D 14. The DSC frequency for distress alerting in Area A2 is ______ . A. 2182KHZ B. 2174.5KHZ C. 2192KHZ D. 2187.5KHZ D 15. What channel is general communication used ? A. any appropriate channel except public communication B. any appropriate channel except for public communications C. any appropriate channel besides public communication D. any appropriate channel beside public communication C 16. why do some stations keep silence ? A. Because they are not engaged in the distress traffic B. they will affect the transmission of the distress traffic C. The powers of these stations are very weak D. They are not in charge of search and rescue B 17. General radio communications in the global system are those between ______ concerning the management and operation of the ships and may have impact on their safety . A. SAR party and the ship in distress B. SAR authorities and the ship in distress and survival craft C. A ship station and any coast station D. Ship stations and shore-based communication network D 18. It is required that ships proceeding at sea should keep continuous watch on ______ . A. VHF channels 16 and 13 B. Appropriate DSC distress and safety frequencies C. INMARSAT TDM message channel D. VHF channel 70 and channel 8 B 19. The ARQ mode should be applied ______ . A. when two stations communicate with each other B. in any radio system and at any time C. when one ship sends a message to another station D. for communication among some stations A 20. What information will a distress alert contain ? A. nature of distress B. type of assistance required C. course and speed and time at which the information was recorded D. A, B, C are all right D 21. A radio determination system based on the comparison of reference signals with radio signals reflected , or retransmitted from the position to be determined, is ______ . A. DF B. Radar System C. DSC System D. COSPAS-SARSAT B 22. With the help of modern technology, ships are able to receive automated broadcast of safety messages ______. A. by day or at night B. almost round the clock C. somewhat and sometime D. from sunrise and sunset B 23. The WWNWS is a coordinated global service for the broadcast by radio of vital information on ______ to marine navigation. A. ship’s movement B. safety C. ship’s management D. hazards D 24. distress alerts will be relayed on the ______ when the RCC considers it necessary . A. dedicated system B. MSI broadcasts C. 518KHZ D. channel 16 B 25. The frequency 518KHZ will be used to transmit ______ and ______ warnings in NAVTEX