过程参数检测及仪表(常太华编)部分习题参考答案第1章9.一般要求标准压力表的允许误差应小于被检压力表允许误差的(1/4~1/10),以此要求从标准压力表的系列中选取。不能。10.不合格。该表的允许误差为±0.04MPa,而其最大绝对误差为±0.05MPa,最大绝对误差大于允许误差。11.1.0级,1.5级12.300mv/mm13.(1)0.1,-0.05,0.2,0.1,-0.1,-0.1(MPa)(2)0.2MPa,合格(3)10.8°/MPa14.选用测量范围为-50~550℃,2.0级的测温仪表15.40格(因仪表刻度标尺的分格值不应小于其允许误差)第2章9.①为随机误差,②③⑤⑥为系统误差,④为粗大误差11.100.96±0.25(P=95%)12.存在系统误差13.28.40为含有粗大误差的测量值14.64.29±0.014℃(P=95%)15.平均值的A类标准不确定度为0.00716.6.24Ω,0.031Ω17.±1.9℃第3章19.557.1℃,538.4℃20.不对,因为热电偶的热电势与温度之间为非线性关系,428.4℃21.439.6℃,362.9℃,76.7℃22.(1)500℃;(2)481℃;(3)300℃;(4)302.6℃23.29.129mv24.-13.6℃25.769.8℃26.155.67Ω,155.64Ω27.679.3Ω,89%28.201.2℃,0.147m第4章8.1341℃,-8℃,+9℃9.768.5℃,1809.9℃,59.7℃,119.5℃10.1881℃第5章12.51.325kPa,401.325kPa,350kPa13.若测量的为正压,被测压力为10004.8mmH2014.0.658MPa15.10MPa,0.5级16.弹簧管压力表,2.5MPa,1.6级(新国标GB/T1226-2001中将一般工业用压力表分为4个精度等级,即1、1.6、2.5和4级)17.0.6级,0.25级(标准压力表的精度等级为0.06,0.1,0.16,0.25,0.4,0.6,参见GB/T1227-2002)18.1.3kPa19.该表的允许误差为0.15MPa,三只弹簧管压力表的基本误差均超过允许误差。1号压力表零点不对,需重装指针;2号压力表的r偏小,需增大r;3号压力表零点不对,r也偏小,需将调零和增大r结合起来。第6章12.(1)C(2)D(3)B(4)E(5)A13.5772kg/h14.4m3/h15.120m3,5m3/h16.8.7Hz~69.7Hz17.2598m-318.1143dm3/h,519dm3/h19.3.14×10-6s,0.552rad20.3.92m3/s第7章8.50t/h,70.7t/h,86.6t/h9.4968m3/h10.符合要求11.400t/h,114.2kPa第8章14.5488Pa,4791Pa,4091Pa,3392Pa,2692Pa15.5700Pa,4900Pa,4100Pa,3300Pa,2500Pa16.4064Pa17.有错误。“+”“-”接反了。-31484.8Pa~-13586.5Pa18.92.03pF,368.09pF,276.06pF第9章17.7.07%18.9.47%,9.7%19.0.1368,0.1297,0.1293,0.137120.(1)不能;要经过预处理,使温度、压力和流量等符合分析仪的要求,并除去对测量影响较大的SO2、H2和水蒸气(2)0.0304(3)0.02919(4)0.03041(5)0.0309521.1.10×10-3S/cm,1.2cm22.0.000287mol/L,16.77mg/L第10章11.(1)251.2m/s,3.155×107m/s2(2)0.3nm12.3.79×10-2cos628t,100Hz