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单选题 The primary function of an electric motor is to______
学科：船舶电子电气专业英语2
时间：2025-12-21 03:09:47
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题目1单选题
The direction of rotation of a three phase asynchronous motor is related to the ________ of the three phase AC power supplyA. currentB. phase sequenceC. frequencyD. voltage
题目2单选题
______ is ultimately the best solution for continuous and stepless speed regulation of the 3-phase asynchronous motorA. Reduced voltage startingB. Direct on line startingC. Voltage transformerD. Frequency inverter
题目3单选题
The ______ is the best known system and perhaps the most common starting system at reduced voltageA. starting with soft starterB. starting with reactors and stator resistorsC. star-delta startingD. starting with auto-transformer
题目4单选题
For a squirrel-cage motor, the rotor is constituted by a system of bars and _______A. brushesB. short-circuit ringsC. slip ringsD. three windings
题目5单选题
The disadvantages of the asynchronous motor are that it requires ________ and it produces a low starting torqueA. much initial currentB. little initial currentC. constant currentD. direct current
题目6单选题
_______ is perhaps the most traditional system and carries out starting at full voltageA. Star-delta startingB. soft startingC. Rotor resistance startingD. Direct-on-line starting
题目7单选题
The disadvantage of direct starting of the motor is ________A. long starting timeB. the impact on the power gridC. the starting torque of the motor decreasesD. the required equipment is complex
题目8单选题
The starting current of an a.c. motor is _____ the rated currentA. equalsB. less thanC. much larger thanD. the same as
题目9单选题
The primary function of an electric motor is to______A. generate high voltagesB. develop torqueC. generate high electrical resistanceD. produce a magnetic field
题目10单选题
______ is a machine by which electrical energy is transformed into mechanical energyA. A diesel engineB. A main switchboardC. An alternatorD. An electric motor
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