【判断题】
[258]设备打开检修前,必须要经过倒空置换,加盲板鼓风等安全措施
A. 对
B. 错
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【判断题】
[259]裂解气压缩机系统“五返五”只为防喘振而设计
A. 对
B. 错
【判断题】
[263]节流膨胀接近于等熵膨胀
A. 对
B. 错
【判断题】
[266]丙烯的爆炸极限为2.4~11%
A. 对
B. 错
【判断题】
[267]化工装置用火,根据用火部位的危险程度可分为两级
A. 对
B. 错
【判断题】
[268]机组润滑采用强制润滑,轴承为三油楔轴承,抗振性能较好,承受负荷较高
A. 对
B. 错
【判断题】
[270]活塞往复一次完成一个工作循环两个止点间活塞的行程称为冲程
A. 对
B. 错
【判断题】
[271]在精馏塔中段设置中段回流可以使塔内各部分汽液相负荷趋于均匀
A. 对
B. 错
【判断题】
[272]
A. 对
B. 错
【判断题】
[273]蒸汽压力越高,其
A. 对
B. 错
【判断题】
[274]将精馏塔与制冷系统联系起来,使热量从高温处取出再送至低温处而构成热泵系统
A. 对
B. 错
【判断题】
[275]流体湍动越激烈,损失的能量越大
A. 对
B. 错
【判断题】
[277]丙烯机四段排出正常温度为212℃,压力为1657MPa
A. 对
B. 错
【判断题】
[278]冷剂无相变时,塔顶冷凝器的负荷主要由冷剂量来调节
A. 对
B. 错
【判断题】
[279]管路中流体流动状态相同,粘度越大,阻力越大
A. 对
B. 错
【判断题】
[280]操作稳定时,乙烯塔总回流量等于塔顶气相物量减去乙烯产品量
A. 对
B. 错
【判断题】
[281]用于解冻的甲醇最低使用温度为-92℃
A. 对
B. 错
【判断题】
[282]用于解冻的甲醇含水量应小于015wt%
A. 对
B. 错
【判断题】
[283]离心泵在启动前必须先排气
A. 对
B. 错
【判断题】
[284]离心式压缩机是利用高速旋转的叶轮产生的离心力作用而使气体增压
A. 对
B. 错
【判断题】
[285]在不发生喘振的前提下减少段间循环量可减少压缩功损失
A. 对
B. 错
【判断题】
[287]碱液消耗量取决于进料中二氧化碳硫化氢的含量和废碱中NaOH的浓度
A. 对
B. 错
【判断题】
[289]当设备中的流体处于静止状态时,其阻力为零,因此,此时流体的粘度为零
A. 对
B. 错
【判断题】
[290]催化剂不影响化学平衡
A. 对
B. 错
【判断题】
[291]如果裂解气压缩机自身原因停车,要立即停乙烯机和丙烯机
A. 对
B. 错
【判断题】
[292]为使压缩机充分预热,开车前必须
A. 对
B. 错
【判断题】
[293]
A. 对
B. 错
【判断题】
[294]可燃物质在空气中的含量低于爆炸下限时,遇到明火,既不会燃烧,也不会爆炸
A. 对
B. 错
【判断题】
[295]皮肤上溅到碱液后应立即用大量水冲洗
A. 对
B. 错
【判断题】
[296]电气设备初起火灾可使用泡沫灭火器
A. 对
B. 错
【判断题】
[297]氢气的爆炸极限4-75%
A. 对
B. 错
【判断题】
[298]将裂解气进行压缩的目的是使后系统较易分离出氢气,CH4以利于后系统操作
A. 对
B. 错
【判断题】
[299]在其它条件不变的条件下,乙烯丙烯的总收率随原料特性因数K值的增加而增加
A. 对
B. 错
【判断题】
[302]甲醇吸入即会中毒但不被皮肤吸收
A. 对
B. 错
【判断题】
[305]裂解气中的硫化氢主要来自原料中的有机硫化物在裂解过程中与氢发生反应而来
A. 对
B. 错
【判断题】
[308]离心式压缩机适用于排气量大而排气压力不太高的领域
A. 对
B. 错
【判断题】
[309]降低吸入温度可降低压缩机功耗
A. 对
B. 错
【判断题】
[311]减少段间压降可降低压缩机功耗
A. 对
B. 错
【判断题】
[313]当压缩机排出压力一定时,若吸入压力增加,则说明气流量增加了
A. 对
B. 错
【判断题】
[314]物质从高温变低温度的过程,叫冷却(不包括相变)
A. 对
B. 错
【判断题】
[315]设备和容器内部动火时,其中的氧含量必在18%以上
A. 对
B. 错
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