【判断题】
客车采用集中供电方式，其供电电压为线电压380V、相电压220V
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相关试题
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轴温监测与报警装置的作用是防止客车燃轴事故的发生
【判断题】
交直流供电装置中的发电机是交流的，而装置的输出是直流的
【判断题】
热继电器主要用于电动机的过载保护，也可作为其他设备发热状态的控制
【判断题】
空气开关相当于闸刀开关、熔断器、热继电器和欠压继电器的组合体
【判断题】
接触器与继电器的结构和工作原理基本相同，可以互换使用
【判断题】
功率表的电流线圈必须串联接入电路，电压线圈必须并联接入电路
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TKZW-1T轴报器主要由传感器,车体配线和报警仪组成
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运行途中，KP-2A型控制箱失控，摘下RD3，电机仍发电，说明SCR短路
【判断题】
旅客列车轴温报警器在运行途中的开机率应不小于90%
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冷凝风机和通风机运转不正常会影响制冷效果
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空调列车在运行途中处理故障时可带电作业
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空调客车的电气设备如电力输送连接器插座与插头，压缩机和通风机的电机等绝缘检查用500V级兆欧表
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软卧呼叫装置的显示与自锁由8个独立单元的非对称双稳态触发器来控制
【判断题】
空调系统的控制电路电压应选取较高值，交流200V或直流110V，以提高工作的可靠性
【判断题】
影响轴温报警器的温度显示误差较大的原因之一是传感器附加电阻值较大
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蓄电池充电末期或大电流充电时，会逸出大量氢气和氧气而形成“爆鸣气”，一旦遇到火花，将发生爆炸
【判断题】
温度变化只与电解液的相对密度有关,与蓄电池的容量无关
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工作在直流1200V及以下电路的电器均属低压电器
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KP-2A型控制箱过压保护回路作用是当发电机失控造成电压过高时，自动切断激磁回路，停止发电机供电，保护发电机及用电器
【判断题】
一般来说，保险丝的熔断电流大于其额定电流
【判断题】
由于保险丝的材质，散热条件和通过电流增长速度不同，故熔断电流值也不一致，一般熔断电流等于额定电流的1、3-2、1倍
【判断题】
钳形电流表可以在测量过程中直接切换量程
【判断题】
湿度对电气装置的影响，主要是使绝缘性能变劣
【判断题】
J5型发电机的激磁方式为自激，吊销与销孔间隙不得大于2毫米
【判断题】
运用客车加挂车每二辆中应配挂母车一辆（特殊情况除外）
【判断题】
在客车配线中，夹布胶管主要用在下部钢管引出线上和上部干线过梁处
【判断题】
只要在电气线路中安装了保险丝，就能起到保险作用
【判断题】
中间继电器只能作转换控制信号的中间元件使用，不能作来直接通断电路
【判断题】
电池接反时，对应急电源系统的损害是烧充电机充电保险丝
【判断题】
新造客车车下布线钢管内电线只允许有一个接头
【判断题】
42V和36V工频交流电在任何情况下都是安全的
【判断题】
交流和直流耐压试验都是利用高压电源进行试验，故都属于破坏性试验
【判断题】
使用500V兆欧表测量客车配线，易损坏车电装置中的半导体元件
【判断题】
兆欧表内设有游丝，不转动发电机手柄时，指针停留在标度尺的无穷大处
【判断题】
当电压显示低于44伏，单个蓄电池电压低于1、8伏时，应根据情况施行补充电或更换
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Nobody noticed the thief slip into the house because the lights happened to _____.___
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----- John， may I ask you a favour？ ----- _________
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The two thieves fled the town separately， _______ a bag.___
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Her heart _____ faster when she entered the exam hall.___
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The taxi driver was put in_____prison because his car had knocked down a child.His wife went to_____ prison to see him twice a month.___
A. /； /
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----- Where’s John， do you know？ ----- Oh， _____to hospital.___
A. he’s taken
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It was the wealth of the_____pioneer landowner John Harvard that made Harvard University possible.___
A. precious
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----- "Where is your college located, John?" ----- "It is ________."___
A. on the Fifth Avenue
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__________ is she in London than she rings up her old friend Mary.___
A. Scarcely
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A fireman discovered the __________ of the fire.___
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I didn't expect to receive a postcard from you！It's really _____my wildest imagination.___
A. behind
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John Smith is _____ honest young man.___
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She __________ in wearing that old – fashioned hat.___
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Some of the meat came from Canada. How about________？___
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I have brought you ___ flowers for your birthday. ___
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I have also experienced many adventures, but nothing that I have seen ___what you have described. ___
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That young man has made so much noise that he ___ not have been allowed attend the concert. ___
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“What is Mary doing at home?” “She is playing ____.”___
A. a piano
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I’m busy now ,ask him to see me ____ time.___
A. the other
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The child took a spoonful and tasted it carefully __________ it was hot.___
A. in case
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The French pianist who had been praised very highly __________ to be a great disappointment. ___
A. turned off
B. turned up
C. turned out
D. turned down
【单选题】
“Shall I turn on the television?” – “No, I’d rather not __________ television tonight.”___
A. have watched
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They said that they had made up their minds to ____the task in spite of the extremely difficult conditions.___
A. carry on
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The two girls are getting on very well and share with each other. ___
A. little
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The teacher said that the classroom was empty __________ a few chairs.___
A. but for
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______you choose， make sure that it is a good one. ___
A. What
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Vingo was released from prison_____the successful efforts of his friends to prove his innocence. ___
A. according to
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Entering the room， I found my father __ at the desk and ___ something .___
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Cake __________ of flour, sugar, egg and some other ingredients. ___
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Mr. Peter wanted Steve to take half the money, but Steve did not __________ it. ___
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I'd like to take my picture ________stands a high tower. ___
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__________ the English examination I would have gone to the concert last Saturday. ___
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