【多选题】
简述长沙地铁2号空压机在未达到工作压力之前，空气压缩机停机的可能存在的故障原因及维修方法。___
A. 车辆主风缸压力控制器是否故障或设定错误；
B. 检查电动机断路器是否跳闸，确认电动机供电电源是否有线路或电气故障
C. 检查风源系统压力控制器是否故障或设定错误。
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相关试题
【多选题】
空调机组产生高压保护的原因。___
A. 冷凝器过脏
B. 制冷剂充注过多
C. 轴流风机反转或不转
D. 排气管段堵塞
E. 空气或不凝性气体混入系统中
F. 热力膨胀阀被堵塞
【多选题】
哪些情况会导致空调机组处于关机模式？___
A. 当模式选择开关处于“关闭”档位，系统忽略来自MVB的命令信号处于关机模式；
B. 当模式选择开关处于“自动”档位时，系统接受到来自MVB的关机信号。
【多选题】
哪些情况会导致空调机组处于紧急通风模式？___
A. MVB正常，且收到“紧急通风”命令；
B. MVB故障，空调控制系统检测不到380V电源信号时（仅故障车进入紧急通风模式，而非故障车仍继续运行）。
【多选题】
试分析空调机组冷量不足的原因：___
A. 混合风滤尘网堵塞
B. 蒸发器、冷凝器过脏
C. 蒸发器结冰
D. 控制柜设定温度过高
E. 少量制冷剂泄漏
F. 制冷剂充注过多
G. 风量不足
【多选题】
试分析列车高压故障时，空调紧急通风的响应过程。___
A. 当功能选择开关处于“测试1、测试2、自动、22℃、24℃、26℃、28℃”档位时，若控制盘检测到主回路电源故障，控制器断开所有吸合的接触器，机组停止运行；
B. 延时10S，控制盘向紧急通风逆变器发送紧急通风信号，接触器EMFK吸合，送风机由紧急通风逆变器供电工作；
C. 当主回路电源恢复，控制盘取消紧急通风信号，接触器EMFK断开；主电路电源恢复后--延时5s，机组进入正常运行状态；
D. 若主回路电源一直未恢复，则紧急通风逆变器工作90min后，控制盘取消紧急通风信号，接触器EMFK断开，机组处于待机状态，直到电源恢复正常后机组重新运行。
【多选题】
有电无气如何升弓？___
A. 当蓄电池电压104v，主风缸风压<4.5bar时
B. 合=72-S101，激活列车
C. 合主控钥匙，司机台激活；
D. 按压受电弓升弓按钮；
E. 到B车升弓柜，用方孔钥匙打开柜门，取出脚踏泵，将两位三通阀旋钮打至垂直位置；
F. 踩压脚踏泵至气压5.5bar受电弓应升起，电客车所有照明（受电弓未升起时只有紧急照明）为正常照明，高压设备工作，压缩机打风，另一端的受电弓自动升起；
G. 将两位三通阀旋钮打至横向位，锁闭好柜门。
【多选题】
无电有气如何升弓？___
A. 当蓄电池电压<104v, 主风缸风压4.5bar
B. 到B车升弓柜，用方孔钥匙打开柜门
C. 将两位三通阀旋钮打至垂直位置，该端受电弓升起；
D. 司机按压司机室继电器柜中的=31-S104（充电机应急启动）至蓄电池电压104V后，(期间可尝试激活蓄电池)合=72-S101，激活列车；
E. 司机按压受电弓“升弓”按钮，受电弓保持升起；
F. 将两位三通阀旋钮打至横向位，锁闭好柜门。
【多选题】
无电无气如何升弓？___
A. 当控制电压<104v,主风缸风压<4.5bar
B. 到B车升弓柜，用方孔钥匙打开柜门，取出脚踏泵；
C. 将两位三通阀旋钮打至垂直位置
D. 司机操作脚踏泵至气压5.5bar，受电弓应升起；
E. 司机按压A车继电器柜面板上充电机应急启动按钮=31-S104 ，A车辅助逆变器风机启动；
F. 辅助逆变器开始工作并对蓄电池进行快速充电，此时合=72-S101，观察司机室蓄电池电压上升超过104V 且电压稳定；
G. 激活列车及司机室，按升弓按钮=21-S102 ，确认升弓显示灯按钮和HMI 显示屏上受电弓状态正确、网压显示正常，等待空压机打气完毕（主风缸气压升至9bar）；
H. 将两位三通阀旋钮打至横向位，锁闭好柜门。
【多选题】
静调电源柜送电操作顺序。___
A. 静调电源柜电缆接头接到车间电源插座。
B. 合上车辆的列车激活开关。
C. 合上静调电源柜总控电源开关。
D. 打开电子锁使静调电源柜控制回路得电。
E. 按下合闸按钮，送电。
【多选题】
描述静调电源柜断电操作顺序。___
A. 按下静调电源柜分闸按钮。
B. 分断列车激活开关。
C. 断开电子锁使静调电源柜控制回路断电。
D. 断开静调电源柜总控电源开关。
E. 断开静调电源柜电缆接头与车间电源插座连接。
【多选题】
在年检作业中，如何检查高速断路器？___
A. 检查高速断路器无损坏、无污垢；
B. 底座螺栓防松线清晰无错位；
C. 高速断路器灭弧罩安装紧固螺栓防松线清晰无错位；
D. 辅助触点端盖内六角紧固螺栓防松线清晰无错位
E. 高速断路器进、出线排紧固螺栓齐全，防松线清晰无错位。
【多选题】
在年检作业中，如何检查接触器(KM1、KM2)状态？___
A. 拆下灭弧罩，灭弧罩应无机械损坏或金属粉尘，否则更换或清除；
B. 接触器主触头外观良好、动作灵活、安装紧固。
【多选题】
在年检作业中，如何检查牵引电机？___
A. 检查进气口和排气口，进、出风滤网紧固螺栓防松线清晰无错位；滤网无堵塞。
B. 检查牵引电机悬挂及电缆、电源盒状态，电机悬挂件防松线清晰无错位；电机机座无裂纹；电缆、电源盒外观无破损、放电烧痕，三相电缆固定螺栓无松动。
C. 检查温度传感器和速度传感器，速度传感器和温度传感器安装稳固，传感器线缆外观无破损、断裂现象。
D. 吹扫进气滤网和出气滤网，用压缩空气清洁进、出气滤网和联轴节。
E. 重新润滑轴承，用壳牌能得力（Shell RETINAX）LX2抗摩擦轴承润滑脂重新润滑深沟球轴承（约 19 g）、圆柱滚子轴承（约 16 g）。
【多选题】
试分析跳主断的原因？ ___
A. 差分电流大于50A、充电超时、充电接触器（KM2）卡合、短接接触器（KM1）卡合；
B. 元件故障、硬件判断网压过压、硬件判断直流过压、硬件判断直流过流、斩波1过流、斩波2过流、电源故障、板不在位；
C. 软件判断网压过压、软件判断中间电压过压、MCU生命信号中断、主断线圈减载故障。
【多选题】
简述牵引系统技术术语和中文名称 ___
A. VVVF（牵引逆变器）、
B. SIV（辅助电源箱）、
C. TCMS（列车控制与监控系统）、
D. DCU（传动控制单元）、
E. HV（高压电器箱）、
F. L（滤波电抗器）、
G. BR（制动电阻）
【多选题】
电气牵引设备主要包括哪些，数量各是多少？___
A. 能耗记录仪箱（B车，共2个）、
B. 高压电器箱（B、C车，共4个）、
C. 滤波电抗器箱（B、C车，共4个）、
D. 牵引逆变器箱（B、C车，共4个）、
E. 制动电阻（B、C车，共4个）、
F. 牵引电机（B、C车，共16个）、
G. 接地装置（A、B、C车，共20个）、
H. 齿轮传动装置（B、C车，共4个）、司机控制器（A车，共2个）。
【多选题】
简述辅助系统组成及相应功能___
A. 逆变部分：辅助用电设备大都需要三相50 Hz，380 V/220 V交流电源，因而首先要将波动的直流网压逆变为恒压恒频的三相交流电。
B. 变压器隔离部分：为了安全必须将电网上的高压与低压用电设备，尤其是常需人工操作的控制电源的设备，在电气电位上实现隔离。通常采用变压器进行电气隔离，同时也可通过设计不同的匝比以满足电压值的需要。
C. 直流电源（兼作蓄电池充电器）：车辆上各控制电器都由直流电源DC/DC供电。车辆上蓄电池为紧急用电所需，所以DC110 V控制电源同时也是蓄电池的充电器。
【多选题】
辅助系统的交流负载有哪些？___
A. 外接AC220V负载插座；
B. 空调压缩机；
C. 冷凝器风机（冷凝器风扇）；
D. 送风机（含空调通风机，蒸发器风扇）；
E. 电加热器；
F. 设备通风机（制动电阻通风）；
G. 空气压缩机
【单选题】
故障车门不能切除，列车区间限速（ ）,站台限速___。
A. 40km/h、5km/h
B. 40km/h、10km/h
C. 35km/h、10km/h
D. 35km/h、5km/h
【单选题】
司机室侧门无法关闭，报告OCC请求增派保安或副司机协助扶住故障门，限速___维持运行到终点站退出服务。
A. 50km/h
B. 45km/h
C. 55km/h
D. 60km/h
推荐试题
【单选题】
Q1: What does the man suggest that the woman do this weekend?___
A. Read J .K .Rowling's first book .
B. Go to buy a new Harry Potter book .
C. Watch BBC news about J .K .Rowling .
D. Take her cousin to see a new Harry Potter movie .
【单选题】
Q2: Where did J. K. Rowling come up with the idea for Harry Potter?___
A. At a cafe .
B. On a train .
C. At a cinema .
D. In a bookstore .
【单选题】
Q3: What are J. K. Rowling’s future plans?___
A. She won't write any more books .
B. She will write more magic stories .
C. She hasn't said anything about her future plans .
D. She said she would work on more serious subjects .
【单选题】
Q4: What are the two speakers mainly talking about?___
A. J.K. Rowling's secret .
B. J .K .Rowling's writing plan .
C. A new book by J .K.Rowling.
D. An interview with J .K .Rowling .
【单选题】
Q1: What happened when Stephen tried to remove a bottle of milk from the refrigerator?___
A. He broke the milk bottle .
B. He fell down on the floor .
C. He made a mess inside the refrigerator .
D. He spilled the milk over the kitchen floor .
【单选题】
Q2: What did Stephen’s mother do when she came into the kitchen？___
A. She gave him a long lecture .
B. She shouted at him in anger .
C. She enjoyed the wonderful mess .
D. She cleaned up the mess with him .
【单选题】
Q3: What did Stephen’s mother teach him later?___
A. How to do an experiment .
B. How to carry a milk bottle .
C. How to clean up spilled milk .
D. How to avoid making mistakes .
【单选题】
Q4: What did Stephen learn from this experience?___
A. Mistakes can become learning opportunities .
B. Mistakes are just like scientific experiments .
C. One should sometimes make mistakes .
D. One should try to avoid making mistakes .
【单选题】
Q1: Why is surfing the man’s favorite activity?___
A. Because he likes the sunny weather.
B. Because he wants to challenge himself .
C. Because it can help solve his sleeping problem .
D. Because it can help him forget all his troubles .
【单选题】
Q2: What is the woman going to do this weekend?___
A. To go sailing .
B. To go surfing .
C. To go to the beach .
D. To go to her nephew's .
【单选题】
Q3: What does the woman love doing?___
A. Going to visit relatives.
B. Enjoying the warm sun on the beach .
C. Building sand castles with her niece and nephew .
D. Playing in the sand and jumping in the waves .
【单选题】
Q4: What does the man remember doing with his brothers?___
A. Surfing in the sea .
B. Collecting seashells .
C. Building sand castles .
D. Jumping in the waves .
【单选题】
Q1: According to the survey, what percentage of British adults watched TV in theirfree time?___
A. 89 percent .
B. 84 percent .
C. 76 percent .
D. 71 percent .
【单选题】
Q2: Which age group would be the most likely to visit their friends and relatives?___
A. People aged 16 to 24
B. People aged 25 to 34 .
C. People aged 16 and over .
D. People aged 55 and over .
【单选题】
Q3: What does the speaker say about listening to music as a leisure activity for British people?___
A. People aged 16 to 24 preferred listening to music most .
B. It was getting more and more popular among the British people .
C. It was the third most popular activity among people aged 55 and over .
D. People aged 25 to 34 listened to music more often than those aged 16 to 24 .
【单选题】
Q4: According to the survey, how are leisure activities related to age?___
A. Older people go out to pubs more often . frequently .
B. Younger people go to the cinema less frequently.
C. Older people spend more time reading and gardening .
D. Younger people spend less time visiting friends and family .
【单选题】
Q1: Why was the girl excited?___
A. She is going to have a lot of vanilla ice cream .
B. She won the spelling competition at her school .
C. She is going to the state capital for a competition .
D. She "excellence"correctly,but others didn't .
【单选题】
Q2: What happened when the man was 13 years old?___
A. His family moved to Sacramento to settle down .
B. His family bought him a new suit and a new tie .
C. He went to Sacramento for a spelling competition .
D. He won the first prize in the state spelling competition .
【单选题】
Q3: Why did the man’s mom give him a big hug?___
A. To make him feel better after he lost the first prize .
B. To apologize for not buying him some ice cream .
C. To wish him good luck in the next competition .
D. To congratulate him on winning the first prize .
【单选题】
Q4: What color is the girl going to wear for her next competition?___
A. Red .
B. Blue .
C. Green .
D. Yellow .
【单选题】
Q1: What is this passage mainly about?___
A. Superstitions and science .
B. Tips on how to have good luck .
C. Superstitions in the United States .
D. Rational and superstitious societies .
【单选题】
Q2: According to the passage, what is considered as bad luck?___
A. Walking under a ladder .
B. Dreaming of a black cat .
C. Hanging a mirror in the house .
D. Stepping on one's own shadow .
【单选题】
Q3: Why is it considered bad luck to see a black cat crossing one’s path?___
A. Because black cats look like witches . e witches .
B. Because black cats were thought to be witches .
C. Because black cats bring seven years of bad luck .
D. Because black cats are hard to notice in darkness .
【单选题】
Q4: According to the passage, what will bring people good luck?___
A. Breaking a mirror on purpose .
B. Catching a falling leaf on one's birthday .
C. Finding a on the ground and picking it up .
D. Dreaming of blowing out the candles in one blow .
【单选题】
Q1: How long will the woman spend on her way to and from work by high-speed train?___
A. 4 hours .
B. 2 hours .
C. 1.5 hours .
D. 45 minutes .
【单选题】
Q2: When does the woman arrive back home by subway?___
A. At 8 .
B. At 7 .
C. At 6 .
D. At 5 .
【单选题】
Q3: According to the woman, in what way will the new high-speed train be a big help to her?___
A. She can either read or rest a little on the train .
B. She can read and respond to emails onthe train .
C. She can travel to many different parts of the city .
D. She can go shopping on her way home from work .
【单选题】
Q4: How will the new high-speed train affect the man?___
A. He can take the train to the old part of the city .
B. He can save a lot of money when he takes the train .
C. He can save 20 minutes to go to work with the train .
D. He can take the train to the airport instead of driving .
【单选题】
Q1: How much time on average do Americans spend on their way to work?___
A. About an hour .
B. More than an hour .
C. About half an hour .
D. More than one and a half hours .
【单选题】
Q2: What is the present situation about Americans’ commuting to work?___
A. More and more Americans spend over an hour getting to work .
B. Over 10 percent of Americans spend less than an hour getting to work .
C. Only New York people spend more than 90 minutes getting to work .
D. Over 10 percent of Americans spend more than 90 minutes getting to work .
【单选题】
Q3: Why does Steven choose to have an extreme commute?___
A. Because gas prices are not high .
B. Because the commute is not tiring .
C. Because he can attend a better school .
D. Because he can have his favorite lifestyle .
【单选题】
Q4: Which of the following is the disadvantage of long commutes?___
A. Traffic jams .
B. Expensive housing .
C. Poorer life quality .
D. A tiring and boring trip .
【单选题】
Q1: What did Katy like about Jason’s last Halloween party?___
A. She liked playing an interesting game .
B. She enjoyed seeing many of her old friends .
C. She enjoyed wearing her Halloween costume .
D. She liked the decorations in Jason's front yard .
【单选题】
Q2: What is the actual reason that Katy doesn’t want to attend Jason’s party?___
A. None of her friends likes Jason .
B. None of Jason's guests is young .
C. She wants to go to Linda's party ..
D. She went to Jason's party last year .
【单选题】
Q3: What is special about Linda’s party?___
A. The party will last four hours .
B. Six people will attend the party .
C. They will have huge bags of candy .
D. They will play a new game called "GuessWho ".
【单选题】
Q4: What will Katy do to solve her problem?___
A. Go to Jason's party .
B. Go to Linda's party .
C. Attend both Jason's and Linda's parties .
D. Celebrate Halloween with her parents .
【单选题】
Q1: What is special about this year’s Black Friday shopping?___
A. Some stores offered bigger holiday discounts .
B. Some stores provided more choices of nightlife.
C. Some stores made efforts to attract young people .
D. Some stores opened much earlier than they used to .
【单选题】
Q2: Why did some stores open at midnight on Thanksgiving night?___
A. To attract young customers .
B. To beat other stores for sale.
C. To let people sleep late the next day .
D. To keep people stay up for the night .
