《春西交《电力拖动自动控制系统》在线作业 满分答案》由会员分享，可在线阅读，更多相关《春西交《电力拖动自动控制系统》在线作业 满分答案（23页珍藏版）》请在金锄头文库上搜索。
1、15春西交电力拖动自动控制系统在线作业 满分答案Austrian Peng 15 spring West to electric drive automatic control system online homeworkTotal score: 100 test time: -Radio examinationA multiple-choice questionJudgment questionRadio examination questions (30 questions, 60 points)1. V-M system in four quadrant operation, forwa
2、rd braking ().A. the polarity of the armature terminal is negativeB. armature current polarity is positiveC. mechanical characteristics are in the second quadrantFull marks: 22. the following statement is correct.A. if the given voltage is constant, the partial pressure ratio that regulates the spee
3、d feedback voltage can not change the speedB. if the given voltage is constant, the partial pressure ratio that regulates the speed feedback voltage does not necessarily change the speedC. if the given voltage is constant, the partial pressure ratio that regulates the speed feedback voltage can chan
4、ge the speedFull marks: 23. speed range means ().A. production machinery requires that the ratio of the maximum speed to the minimum speed provided by an electric motor is called the speed rangeB. production machinery requires that the ratio of the minimum speed to the maximum speed provided by an e
5、lectric motor is called the speed rangeC. production machinery requires that the ratio of the average speed to the minimum speed provided by an electric motor is called the speed rangeD. production machinery requires that the ratio of the maximum speed to the average speed provided by an electric mo
6、tor is called the speed rangeFull marks: 24. what are the basic characteristics of speed single closed loop speed regulation system?.A. uses only the proportional amplifier feedback control system, its modulation quantity still has no static difference.The function of B. feedback control system is t
7、o resist disturbance and obey the given. Disturbance performance is one of the most prominent characteristics of feedback control systemThe accuracy of the C. system depends only on the given accuracyThe accuracy of D. system depends only on the accuracy of feedback detectionFull marks: 25. when the
8、 constant voltage constant frequency sine wave power supply, the mechanical characteristic of the asynchronous motor is correct.A. when the S is very small, the torque is approximately proportional to the s, and the mechanical characteristics are a hyperbola that is symmetrical at the originB. when
9、the S is very small, the torque is approximately inversely proportional to s, and the mechanical characteristic is a straight lineC. when the S is close to 1, the torque is approximately inversely proportional to s. At this point, Te = f (s) is a hyperbola that is symmetrical at the originD. when th
10、e S is close to 1, the torque is approximately proportional to s. At this point, Te = f (s) is a hyperbola that is symmetrical at the originFull marks: 2In the four quadrant operation of the 6. V-M system, the forward run time ().A. the polarity of the armature terminal voltage is positiveB. the pol
11、arity of the armature current is negativeC. mechanical characteristics are in the second quadrantFull marks: 27. a range of speed closed-loop speed control system is 1500150r/min, static slip 2% system, static downhill open loop system is 100r/min, the closed loop systems open-loop amplification (wh
12、at).A. 30B. 31.7C. 33.2D. 28Full marks: 28. a range of speed closed-loop speed control system is 1500150r/min, requirement of static rate of 2% system, then the system is allowed (static downhill).A. 3.06r/minB. 2.8r/minC. 3.46r/minD. 4.00r/minFull marks: 29., the static frequency conversion device
13、can be divided into (two) types.A.Indirect frequency conversion and direct frequency conversionB. only direct frequency conversionC. only indirect frequency conversionD. or more is incorrectFull marks: 2The advantage of 10. synchronous motors is thatA. speed and voltage, frequency strictly synchrono
14、us, power factor is as high as 1B. difficult to startThere are oscillations in C. overloading and even risk of missing stepFull marks: 211. power factor of synchronous motor ()A. can be adjusted by excitation current, which can be delayed or advancedB. can not be delayed or advancedC. can only lag b
15、ehind, can not advanceFull marks: 212. when the speed and current double closed loop speed regulation system runs in a steady state, the input bias voltage and output voltage of the two regulators are wrong.A. when the two regulators are not saturated, their input bias voltage is zeroB. when the two regulators are not saturated, their input bias voltage is not zeroThe output limiting voltage of the C. speed regulator ASR determines the maximum value of the current given voltageThe output limiting
