问题 问答题 简答题

风力机过速保护是直接关系机组安全的一个保护信号,常见的硬件过速有哪几种?

答案

参考答案:

离心式继电器:由于转速上升,继电器机械触点动作,打开电气或液压回路,使机组紧急停机。

爆破阀或安全阀:转速上升,使叶尖液压油缸内部压力升高,最终使爆破阀或安全阀动作,液压系统泻压,叶尖甩出,保证转速不继续上升。

独立的过速保护系统:独立于控制系统的过速保护系统,对转速进行检测,转速超过限定时中断机组安全系统,强制停机。

填空题
阅读理解

Most of us know little about the mental processes that lie behind our decisions. Luckily, what psychologists are finding may help us all make better choices. Here are some of their amazing discoveries to help you make up your mind.

Consider your emotions. You might think that emotions are the enemy of decision making, but in fact they’re a part of it. Whenever you make up your mind, your brain’s emotional center is active. University of Southern California scientist, Antonio Damasio, has studied people with damage to only the emotional parts of their brains, and found that they were unable to make basic choices about what to wear or eat. Damasio thinks this may be because our brains store emotional memories of past choices, which we use to help the present decision making.

However, making choices under the influence of an emotion can greatly affect the result. Take anger, for example. A study by Nitika Garg of the University of Mississippi and other scientists found the angry shoppers were more likely to choose the first thing they were offered rather than considering other choices. It seems anger can lead us to make quick decisions without much thinking.

All emotions affect our thinking and motivation, so it may be best to avoid making important decisions under their influence. Yet strangely there’s one emotion that seems to help us make good choices. The American researchers found that sad people took time to consider the various choices on offer, and ended up making the best choices. In fact many studies show that people who feel unhappy have the most reasonable view of the world.

小题1:According to the text, what may help us make better decisions?

A.To think about happy times.

B.To make many decisions at a time.

C.To stop feeling regretful about the past.

D.To learn about the process of decision-making.小题2:Damasio’s study suggests that ______.

A.emotions are the enemy of decision making

B.our brain has nothing to do with decision making

C.people with physical damage find it hard to make up their minds

D.our emotional memories of past choices can affect present decisions小题3:Why are angry shoppers more likely to choose the first thing they are offered?

A.They often forget their past choices.

B.They make decisions without much thinking.

C.They tend to save time when shopping.

D.They are too angry to bargain.小题4:What do we learn from the text?

A.Emotions are a part of decision making.

B.Sad people always make the worst choices.

C.No emotion seems to help us make good choices.

D.Only sad feelings affect our thinking and motivation.