20春学期《低压保护电器可靠性理论及其应用》在线平时作业2

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低压断路器<span>成功率验证试验供抽样的产品数量可以小于试品数<span>n的10倍。（&nbsp;）</span></span>
A:错误
B:正确

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-bidi-font-weight: bold; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">产品的工作可靠性只与产品固有可靠性有关。（&nbsp;&nbsp;&nbsp; ）</span>
A:错误
B:正确

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">当f(t)为威布尔分布函数时，在v=1,t0=0不变情况下，当形状函数<span lang="EN-US"><span style="POSITION: relative; TOP: 3pt; mso-text-raise: -3.0pt"></span></span>m&lt;1时，f(t)曲线随时间单调下降。(&nbsp;&nbsp;&nbsp; )</span>
A:错误
B:正确

破坏性<span>检查是为了重现故障，判断故障部位，有助于最终判断失效模式及分析失效机理。(&nbsp;&nbsp; )</span>
A:错误
B:正确

针对操作故障，漏电保护器采用保护成功率的高低作为可靠性指标<span>(<span>&nbsp;&nbsp; )</span></span>
A:错误
B:正确

实验室试验能更好地控制受试品性能的监测和失效显示。<span>(<span>&nbsp;&nbsp; )</span></span>
A:错误
B:正确

成功率是品在规定的条件下完成规定功能的概率或产品在规定的条件下试验成成功率功的概率。<span>（</span><span>&nbsp;&nbsp;&nbsp; </span>）
A:错误
B:正确

质量管理图的上下控制限间距离为<span>6</span>&sigma;(&sigma;为统计量<span>Y的标准离差)。(&nbsp;)</span>
A:错误
B:正确

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'">中位寿命是产品可靠度等于中间时的可靠寿命（</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 宋体">&nbsp;&nbsp;&nbsp; </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'">）</span>
A:错误
B:正确

7.2倍额定电流下热过载保护继电器的可靠性试验是从冷态开始的。（<span>&nbsp;）</span>
A:错误
B:正确

<div>假设一个产品是10个部件串联组成，寿命服从指数分布，若每个部件工作10000小时的可靠度为0.9，求产品工作到10000小时的可靠度<span>(<span>&nbsp;&nbsp; &nbsp;)</span>。</span></div>
A:<div>0.349</div>
B:&nbsp;0.528&nbsp;
C:0.439&nbsp;
D:<span>0.934</span>

<div>以下不属于故障树分析工作内容的是（<span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>）</span></div><div><span></span></div>
A:<div>构建故障树<span><span>&nbsp;</span></span></div>
B:分析故障模式的严酷度<span>&nbsp;&nbsp;&nbsp;</span>
C:<div>计算顶端事件的发生概率<span><span>&nbsp;</span></span></div>
D:编写故障树分析报告

<div>统计质量管理的缺点是（<span>&nbsp; ）</span></div><div><span></span></div>
A:<div>不能进行大规模的质量检验<span>&nbsp;</span></div>
B:不能应用电子计算机软件辅助设计
C:<div>不能进行废品的先兆分析<span><span>&nbsp;&nbsp; </span></span></div>
D:过分地强调了质量控制的统计方法

<div>一直标准正态分布的下侧分位数为<span>0.5，则它对应的正态分布N（2，2）的下侧分位数为（&nbsp; ）。</span></div>
A:0.5
B:1
C:2
D:3

.<img height="126" width="555" alt="" src="http://file.open.com.cn/ItemDB/106719/f7d28d3c-eea5-4a32-8fd0-26851e7005a9/201232102854324.JPG" />
A:<div>&nbsp;e^-1<span>&nbsp;&nbsp;</span></div>
B:e^-10&nbsp;&nbsp;&nbsp;&nbsp;
C:e^-2
D:e^-20

<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold"><font size="3">以下不属于可靠性度量指标是（<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span><span style="mso-spacerun: yes">&nbsp; </span></span>）</font></span></p>
A:<span style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold"><font size="3">平均故障间隔时间</font></span>
B:<font face="宋体" size="3">故障率</font>
C:<font face="宋体" size="3">风险顺序数</font>
D:<font face="宋体" size="3">贮存寿命</font>

<div>（<span>&nbsp; ）叫质量管理</span></div><span><span><div></div></span></span>
A:<span><span>&nbsp; 在质量方面策划和控制组织的协调的活动<div></div></span></span>
B:<div>在质量方面指挥和控制组织的协调的活动</div>
C:<div>在质量方面指挥和控制组织的活动</div>
D:<div>在质量方面策划和控制组织的活动</div>

已知某产品寿命服从双参数指数分布<span>0.5 e^-0.5(t-2)，则它的平均寿命是(&nbsp;&nbsp; &nbsp;)</span>
A:1
B:2
C:3
D:4

<div>针对（<span>&nbsp; ）故障，小型断路器采用故障率</span>&lambda;的大小作为可靠性指标。</div><div><span></span></div>
A:<div>误动<span> </span></div>
B:拒动&nbsp;
C:操作
D:&nbsp;复位

<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-weight: bold; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-style: italic">已知一批产品的失效率</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: &quot;Times New Roman&quot;; mso-bidi-font-weight: bold; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 宋体; mso-bidi-font-style: italic"><span style="POSITION: relative; TOP: 3pt; mso-text-raise: -3.0pt"><v:shapetype id="_x0000_t75" stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"><span lang="EN-US" style="FONT-FAMILY: Symbol; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-char-type: symbol; mso-symbol-font-family: Symbol"><span style="mso-char-type: symbol; mso-symbol-font-family: Symbol">l=2,</span></span></v:shapetype></span></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-weight: bold; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-style: italic">求这批产品的可靠度</span><em><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: &quot;Times New Roman&quot;; mso-bidi-font-weight: bold; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 宋体">R</span></em><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: &quot;Times New Roman&quot;; mso-bidi-font-weight: bold; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 宋体; mso-bidi-font-style: italic">=( <span style="mso-spacerun: yes">&nbsp;</span><span style="mso-spacerun: yes">&nbsp;</span>)</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-weight: bold; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-style: italic">。</span>
A:<span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-weight: bold; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 宋体; mso-bidi-font-style: italic">e^-2t</span>
B:<span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-weight: bold; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 宋体; mso-bidi-font-style: italic">e^t</span>
C:<span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-weight: bold; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 宋体; mso-bidi-font-style: italic">e^-0.5t</span>
D:<span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-weight: bold; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 宋体; mso-bidi-font-style: italic">e^2t</span>