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仪表工试题你能不能答满分

仪表工试题你能不能答满分

一、填空题(每空1分,共计25分)

1.差压变送器的膜盒内充有(    ),它除了传递压力之外,还有(  )作用,所以仪表输出平稳。

2.变送器进行小信号切除的原因是  (                         )  ,通常有 (          ) 、(         ) 两种切除模式。

3.用热偶测量温度时,其连接导线应该使用(         );补偿导线是热偶的延长,但必须考虑热偶冷端的(     )。

4.数字电路中三种最基本的逻辑关系为(  )、(    )、(   )。

5.差压式流量计包括(        )、(       )、(      )三部分。

6.气动调节阀中阀门定位器包括(      )阀门定位器和(     )阀门定位器。

7.自动调节系统按调节器具有的调节规律来分,通常有(    )、(      )、(        )、(                   )等调节系统。

8.安全栅一般分为(       )安全栅和(       )安全栅。

9.本安型仪表又叫(          )仪表,它用 (         ) 把危险场所和非危险场所电路分开。

10.热电偶产生热电势的条件是(             )、(               )。

二、选择题(每题1分,共15分)

1.流量是指(     )内流过管道某一截面积的流体数量。

A.单位体积    B.单位时间     C.单位面积

2.相同差压下,压力损失最大的节流装置的名称是(    )。

A.喷嘴    B.孔板    C.文丘利管

3.扭力管浮筒液面计的浮筒破裂,则仪表指示为(   )。

A.最大  B.最小    C.不定

4.扭力管浮筒液面计的浮筒脱落,则仪表指示为(   )。

A.最大  B.最小    C.不变

5.转子流量计中转子上下的压差由(  )决定。

A.流体的流速    B.流体的压力     C.转子的重量

6.在管道上安装孔板时如果将方向装反将会造成?(   )。

A、差压计倒指示          B、差压计指示变小

C、差压计指示变大        D、对差压计指示无影响

7.一台安装在设备内最低液位下方的压力式液位变送器,为了测量准确,压力变送器必须采用(    )。

A.正迁移           B.负迁移  

C.γ射线           D.X射线

8.在DCS中SV,代表的含义是(   )。

A、实际值               B、设定值  

C、输出信号             D、中间变量

9.现场启动差压变送器的顺序是(    )。

A、关闭平衡门,打开正压室,打开负压室

B、打开负压门,关闭平衡门,打开正压门

C、同时打开正,负压门,关闭平衡门

10.液位测量双法兰变送器表体安装位置最好安装在(   )。

A、正负压法兰之间         

B、负压法兰上方    

C、正压法兰下方 

11.关于电磁流量计,下列叙述错误的是(   )。

A、电磁流量计不能测量气体介质流量

B、电磁流量计的输出电流与介质流量有线性关系

C、电磁流量变送器和化工管道紧固在一起,可以不必再接地

D、电磁流量计无压力损失,直管段要求低

12.热电偶的延长用(   )。

A、导线     B、三芯电缆    C、补偿导线   D、控制电缆

13.1.5级压力表其在0.1MPa测量点的基本误差为(    )。

A、±0.001            B、±0.0015       

C、±0.0025           D、±0.004

14.P=0时, 压力变送器输出I=(  )。

A、 2mA    B、 4mA  

 C、 8mA    D、 10 mA

15.一台测量变送器,量成为8MPa,当变送器显示50%时,测量压力为(  )。

A、4MPa   B、5MPa    C、12mA    D、20 mA

三、判断题(每题3分,共计15分)

1.探头安装一般要在机组静止状态下进行(   )

2.在信号报警联锁系统中,为了减少联锁电路出现误动作的机会,提高联锁动作的可靠性,可以采用三选二表决电路(  )

3.串级调节系统副调节器一般选用调节器规律是比例调节,主调节器用比例积分调节(   )

4.比例调节中,比例度δ越小,调节作用越弱,不会引起振荡(   )

5.逻辑或的关系是当决定一种事情的各个条件都具备,这种事情才发生(  )

四、简答题(共45分)

1.联锁系统中用的电磁阀一般应工作在什么状态下?为什么?(10分)

答:

2.阀门定位器的作用有哪些? (10分)

答:

3.法兰变送器安装时,为什么一定要选择周围环境温度比较恒定的地方?

。(10分)

答:

3.采用热电偶测量温度时,为什么要进行冷端温度补偿?一般有哪些冷端温度补偿方法?(6分)

答:

5.电气火灾扑救时应注意哪些问题?(至少答出三条)(4分)

答:

6.压力变送器常见故障及处理方法。(5分)

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  1. CONNECT:[ UseTime:0.000685s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000777s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000358s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000286s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000481s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000580s ]
  8. SELECT * FROM `article` WHERE `id` = 812897 LIMIT 1 [ RunTime:0.003738s ]
  9. UPDATE `article` SET `lasttime` = 1782655191 WHERE `id` = 812897 [ RunTime:0.011241s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000270s ]
  11. SELECT * FROM `article` WHERE `id` < 812897 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000449s ]
  12. SELECT * FROM `article` WHERE `id` > 812897 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000466s ]
  13. SELECT * FROM `article` WHERE `id` < 812897 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000687s ]
  14. SELECT * FROM `article` WHERE `id` < 812897 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001490s ]
  15. SELECT * FROM `article` WHERE `id` < 812897 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010526s ]
0.109180s