【判断题】
调速系统由感受机构、放大机构、执行机构、反馈机构组成
A. 对
B. 错
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A
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企业标准化是围绕实现企业生产目标,使企业的全体成员、各个环节和部门,从纵向到横向的有关生产技术活动达到规范化、程序化和科学化
A. 对
B. 错
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具体地说,企业标准化工作就是对企业生产活动中的各种技术标准的制定
A. 对
B. 错
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汽轮机负荷增加时,流量增加,各级的焓降均增加
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水蒸气的形成经过五种状态的变化,即未饱和水、饱和水、湿饱和蒸汽、干饱和蒸汽和过热蒸汽
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危急保安器常见的形式有偏心飞环式和偏心飞锤式
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汽轮机常用的联轴器有三种,即刚性联轴器、半挠性联轴器和挠性联轴器
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当流体流动时,在流体层间产生阻力的特性称为流体的黏滞性
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从辐射换热的角度上看,一个物体的吸收率小,则辐射能力强
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目前,火力发电厂防止大气污染的主要措施是安装脱硫装置
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火力发电厂的循环水泵一般采用大流量、高扬程的离心式水泵
A. 对
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由于受客观条件限制,在运行中暂时无法解决、必须在设备停运时才能解决的设备缺陷,称三类设备缺陷
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工作结束前,如必须改变检修与运行设备的隔离方式,必须重新签发工作票
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工作负责人应对工作许可人正确说明哪些设备有压力、高温和有爆炸危险
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A. 对
B. 错
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液体流动时影响能量损失的主要因素是流体的粘滞性
A. 对
B. 错
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离心泵的工作点在QH性能曲线的下降段才能保证水泵运行的稳定性
A. 对
B. 错
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汽轮机机组参与调峰运行,由于负荷变动和启停频繁,机组要经常承受剧烈的温度和压力变化,缩短了使用寿命
A. 对
B. 错
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汽轮机变工况时,级的焓降如果不变,级的反动度也不变
A. 对
B. 错
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汽轮机冷态启动冲转的开始阶段,蒸汽在金属表面凝结,但形不成水膜,这种形式的凝结称珠状凝结
A. 对
B. 错
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凝汽式汽轮机当蒸汽流量增加时,调节级焓降增加,中间级焓降基本不变,末几级焓降减少
A. 对
B. 错
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汽轮机内叶轮摩擦损失和叶高损失都是由于产生涡流而造成的损失
A. 对
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汽轮机供油系统的主要任务是保证调速系统用油,供给机组各轴承的润滑和冷却用油,及供给发电机密封用油
A. 对
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A. 对
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A. 对
B. 错
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降低排汽压力可以使汽轮机相对内效率提高
A. 对
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蒸汽与金属间的传热量越大,金属部件内部引起的温差就越小
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汽轮机金属部件承受的应力是工作应力和热应力的叠加
A. 对
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A. 对
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汽轮机在稳定工况下运行时,汽缸和转子的热应力趋近于零
A. 对
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汽轮机的节流调节法也称质量调节法。只有带上额定负荷,节流门才完全开启
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汽轮机冷态启动定速并网后加负荷阶段容易出现负胀差
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汽轮机空负荷试验是为了检查调速系统空载特性及危急保安器装置的可靠性
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