trắc nghiệm GMDSS pin

Tổng quan hệ thống GMDSS phục vụ TKCN. Năm 1979,Tổ chức Hàng Hải quốc tế (International Maritime Organization IMO) đã tổ chức hội nghị về vấn đề tìm kiếm và cứu nạn trên biển. ... Hệ thống mới được tự động hóa và sử dụng sóng vô tuyến trái đất và vệ tinh cho báo động cấp cứu và các thông tin theo sa

Cau hoi A B C D Dap an Cau hoi A B C D Dap an Cau hoi A B C D Dap an Cau hoi A B C D Dap an Cau hoi A B C D Dap an Cau hoi A B C D Dap an Cau hoi A B C D Dap an Cau hoi The specific gravity of a lead acid battery is checked with an ammeter a multimeter a galvanometer a hydrometer A It is important to ventilate a ship’s battery locker to allow oxygen into the locker to assist charging prevent sulphation on the terminals reduce the risk of explosion keep the cell tops dry A When measuring the specific gravity, a fully charged lead acid battery in good condition is 1150 between 1100 and 1210 1080 between 1250 and 1280 A A lead acid battery may be considered fully discharged if the specific gravity reading is 1150 or lower between 1250 and 1280 between 1250 and 1150 1150 or higher A When maintaining lead acid batteries, protective clothing should be worn because there is risk of electric shock corrosive electrolyte is used the battery compartment may be in a dangerous location volatile gasses may be emitted A The electrolyte of a lead acid battery is dilute sulphuric acid concentrated sulphuric acid dilute hydrochloric acid concentrated hydrochloric acid A The state of charge of a lead-acid battery can be determined by measuring the specific gravity of the electrolyte measuring the temperature of the electrolyte measuring the voltage off load measuring maximum current under load A When carrying out battery maintenance petroleum jelly is recommended for A B C D Dap an Cau hoi A B C D Dap an protecting exposed terminals and connectors against acid leakage through cell top caps hands from acid splashes the battery casing from corrosion A Dirty battery terminals may cause excessive gassing a decrease in the discharge current when off load an increase in charging voltage a decrease in the voltage of the battery when on load A