【判断题】【消耗次数:1】
在易燃、易爆场所的照明灯具,应使用密闭形或防爆形灯具,在多尘、潮湿和有腐蚀性气体的场所的灯具,应使用防水防尘型。
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错误
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相关题目
【单选题】 在特别潮湿的场所,导电良好的地面使用手持照明灯具等,照明电源电压不应大于( )V。
①  12
②  24
③  36
④  42
【单选题】 室内灯具离地面低于2.4m,手持照明灯具,一般潮湿作业场所的照明,电源电压应不大于( )V。
①  36
②  42
③  12
④  6
【多选题】 使用手持照明灯具应符合一定的要求( )。
①  电源电压不超过36V
②  灯体与手柄应坚固,绝缘良好,并耐热防潮湿
③  灯头与灯体结合牢固
④  灯泡外部要有金属保护网
⑤  金属网、反光罩、悬吊挂钩应固定在灯具的任何部位上
【单选题】 照明灯具灯具的绝缘电阻值不小于( )。
①  2MΩ
②  5MΩ
③  1MΩ
④  10MΩ
【多选题】 下列工序属于成套电气照明灯具的施工工序有()
①  A灯具检查
②  B灯具安装
③  C灯具接线
④  D灯具送电
【判断题】 照明灯具的施工程序是:灯具开箱检查→灯具组装→灯具安装接线→送电前的检查→送电运行
①  正确
②  错误
【单选题】 照明灯具应优先选用配光合理,效率高,室内开敞式灯具的效率不宜低于( )。
①  75%
②  70%
③  55%
④  50%
【单选题】 照明灯具的螺口灯头接电时,( )。
①  相线应接在中心触点端上
②  零线应接在中心触点端上
③  可任意接
④  相线零线都接在螺纹端上
【判断题】 易燃材料施工配套使用照明灯应有防爆装置
①  正确
②  错误
【单选题】 安装室外照明灯时,对墙上灯具允许安装高度可低至( )。
①  2.5m
②  3.5m
③  4.5m
④  6.0m
随机题目
【单选题】 Modern ____ perhaps causes more problems than it solves.
①  technique
②  technology
③  tactics
④  tendency
【单选题】 Dreams are beautiful. However, to _____ them needs lots of time and work.
①  discover
②  find
③  achieve
④  stop
【单选题】 People____ very much in their ideas.
①  change
②  vary
③  alter
④  transform
【单选题】 — The old man wouldn’ t stay at home for a rest even if it rained. —_____. He would feel sick if he stayed home for one day.
①  So would my grandpa
②  So wouldn’ t my grandpa
③  Neither would my grandpa
④  Nor wouldn’ t my grandpa
【单选题】 The dispute is ____ to be settled for a long time to come.
①  uncertain
②  susceptible
③  impossible
④  unlikely
【单选题】 I cannot read your writing. It is ____.
①  legible
②  illegible
③  eligible
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【单选题】 I caught a____ of the car before it disappeared around the bend.
①  glance
②  glimpse
③  look
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【单选题】 Unless all the members agree to ____ to the plan there may be further development in the course of action.
①  tumble
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①  fraud
②  alarm
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【单选题】 It was dark in the cave so she ____ a match.
①  struck
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③  fired
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