[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fU3lXD3zk3w9btd5WT2BN3IUwwJbL6VIzcIyKsfwLArE":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":27,"type":28},[],"2025-12-21 11:09:47",277264862,[8,9,10,11],"much initial current","little initial current","constant current","direct current",{"courseId":13,"courseImg":14,"courseName":15},"1ee0524c41359babf33f794b5cc60b3f","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F25b30343053994e8940089572d36015b.jpg","船舶电子电气专业英语2","The disadvantages of the asynchronous motor are that it requires ________ and it produces a low starting torque",[18,29,38,47,56,59,68,77,86,95],{"answer":19,"createTime":5,"id":20,"options":21,"question":26,"source":27,"type":28},[],277264858,[22,23,24,25],"current","phase sequence","frequency","voltage","The direction of rotation of a three phase asynchronous motor is related to the ________ of the three phase AC power supply","v1",0,{"answer":30,"createTime":5,"id":31,"options":32,"question":37,"source":27,"type":28},[],277264859,[33,34,35,36],"Reduced voltage starting","Direct on line starting","Voltage transformer","Frequency inverter","______ is ultimately the best solution for continuous and stepless speed regulation of the 3-phase asynchronous motor",{"answer":39,"createTime":5,"id":40,"options":41,"question":46,"source":27,"type":28},[],277264860,[42,43,44,45],"starting with soft starter","starting with reactors and stator resistors","star-delta starting","starting with auto-transformer","The ______ is the best known system and perhaps the most common starting system at reduced voltage",{"answer":48,"createTime":5,"id":49,"options":50,"question":55,"source":27,"type":28},[],277264861,[51,52,53,54],"brushes","short-circuit rings","slip rings","three windings","For a squirrel-cage motor, the rotor is constituted by a system of bars and _______",{"answer":57,"createTime":5,"id":6,"options":58,"question":16,"source":27,"type":28},[],[8,9,10,11],{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":27,"type":28},[],277264863,[63,64,65,66],"Star-delta starting","soft starting","Rotor resistance starting","Direct-on-line starting","_______ is perhaps the most traditional system and carries out starting at full voltage",{"answer":69,"createTime":5,"id":70,"options":71,"question":76,"source":27,"type":28},[],277264864,[72,73,74,75],"long starting time","the impact on the power grid","the starting torque of the motor decreases","the required equipment is complex","The disadvantage of direct starting of the motor is ________",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":27,"type":28},[],277264865,[81,82,83,84],"equals","less than","much larger than","the same as","The starting current of an a.c. motor is _____ the rated current",{"answer":87,"createTime":5,"id":88,"options":89,"question":94,"source":27,"type":28},[],277264866,[90,91,92,93],"generate high voltages","develop torque","generate high electrical resistance","produce a magnetic field","The primary function of an electric motor is to______",{"answer":96,"createTime":5,"id":97,"options":98,"question":103,"source":27,"type":28},[],277264867,[99,100,101,102],"A diesel engine","A main switchboard","An alternator","An electric motor","______ is a machine by which electrical energy is transformed into mechanical energy"]