简答题In the spring operating mechanism of circuit breaker, in general, the opening spring is stored by the closing spring. A、正确 B、错误简答题The function of metal bellows in vacuum arc extinguishing chamber is ( ). A、Seal B、 Arcing C、 Shielding D、 conductive简答题At present, less oil circuit breaker is widely used in power system. A、正确 B、错误简答题Which of the following is the parameter representing the mechanical properties of the circuit breaker ( ). A、Rated current B、 Synchronism C、Mechanical life D、 The rated voltage简答题The mechanical life of the high voltage circuit breaker is in commonly ( ) more than once. A、2 B、20 C、200 D、2000简答题At present,35kV and below circuit breakers mostly use manual operation mechanism. A、正确 B、错误简答题The start and stop of oil pump of hydraulic operation mechanism of circuit breaker is controlled by oil pressure switch. A、正确 B、错误简答题Switching arc generation has the following main ways () A、Circuit on and off B、 Contact closed C、Vacuum and gas gap breakdown D、 Conversion of spark discharge to arc discharge简答题Check the number of operations the circuit breaker can withstand, generally do ( ). A、Dc resistance measurement test B、Mechanical properties test C、Pressure test D、 Operating life test简答题The main ways of AC arc extinction are () A、Forced arc extinguishing B、Cut off C、Zero crossing arc extinguishing D、 Inverter arc简答题Which of the following is not the function of a circuit breaker ( ). A、Isolated power supply B、 Switching operation C、Fractional and small current D、Breaking short circuit current简答题SF6 gas chemical properties are () A、SF6 gas is insoluble in water and transformer oil B、At blazing temperatures it reacts with oxygen, argon, aluminum, and many other substances; C、Under the action of arc and corona, SF6 gas will decompose, producing low-fluorine compounds, which can cause damage to insulation materials D、The decomposition reaction of SF6 is closely related to moisture, so desiccation measures should be taken简答题The oil in the low oil circuit breaker acts as (). A、Cooling B、 Insulation C、Arcing D、To protect the简答题The following of SF6 gas purity is true ( ). A、Toxic B、 Colorless C、Smelly D、Can burn简答题The main uses of disconnecting switch are () A、Maintenance and segmental isolation B、 Change the way it operates C、Switching on and off small current circuits D、To turn off or off the charging current of a certain length of line简答题Electrical Equipment Representative (GW7-252DW/3150) A、Disconnecting switch B、 Indoor C、Rated voltage 7kV D、Rated current 3150A简答题According to the mode of movement, the disconnecting switch can be divided into () A、Horizontal rotation B、 Vertical rotation C、 Oscillating D、plug-in简答题At present, what kind of high-voltage circuit breaker is widely used in 110kV and above power grids.（ ） A、Vacuum circuit breaker B、High voltage circuit breaker C、SF6 circuit breaker D、 Air circuit breaker简答题High voltage circuit breaker mechanical life times than the number of electrical life.（ ） A、More B、Less C、 As much D、sometimes more, sometimes less简答题Which of the following is the parameter representing the electrical performance of a circuit breaker ( ). A、Closing time B、Synchronism C、Mechanical life D、 The rated voltage