《电工技术基础与技能》(第2版,陈雅萍主编)习题答案教程文件

《电工技术基础与技能》(第2版,陈雅萍主编)习题答案

《电工技术基础与技能》第二版参考答案

第1章课程导入

1.1 认识电工实验实训室

思考与练习

1．直流交流

2．有电切断

1.2 安全用电常识

思考与练习

1．50mA 36V

2．正确安装用电设备安装漏电保护装置电气设备的保护接地电气设备的保护接零

3．用水和泡沫

复习与考工模拟

一、是非题

1．× 2．√ 3．√ 4．× 5．× 6．√ 7．× 8．√ 9．√ 10．×

二、选择题

1．B 2．A 3．A 4．C 5．C

三、简答题

1．电工实验实训室通常的电源配置有：①两组可调直流稳压电压；②3～24V 多挡低压交流输出；③单相交流电源；④TTL电源；⑤三相交流电压输出。

2．常用电工仪器仪表有：电流表、电压表、万用表、示波器、毫伏表、频率计、兆欧表、钳形电流表、信号发生器、单相调压器等。常用电工工具有：老虎钳、尖嘴钳、斜口钳、剥线钳、螺丝刀、镊子、电工刀、试电笔等。

3．实验实训室的安全操作规程：

（1）实验实训前必须做好准备工作，按规定的时间进入实验实训室，到达指定的工位，未经同意，不得私自调换。

（2）不得穿拖鞋进入实验实训室，不得携带食物进入实验实训室，不得让无关人员进入实验实训室，不得在室内喧哗、打闹、随意走动，不得乱摸乱动有关电气设备。

（3）任何电气设备内部未经验明无电时，一律视为有电，不准用手触及，任何接、拆线都必须切断电源后方可进行。

（4）实训前必须检查工具、测量仪表和防护用具是否完好，如发现不安全情况，应立即报告老师，以便及时采取措施；电器设备安装检修后，须经检验后方可使用。

（5）实践操作时，思想要高度集中，操作内容必须符合教学内容，不准做任何与实验实训无关的事，

（6）要爱护实验实训工具、仪器仪表、电气设备和公共财物。

（7）凡因违反操作规程或擅自动用其他仪器设备造成损坏者，由事故人作出书面检查，视情节轻重进行赔偿，并给予批评或处分。

（8）保持实验实训室整洁，每次实验实训后要清理工作场所，做好设备清洁和日常维护工作。经老师同意后方可离开。

4．常见的触电类型：单相触电、两相触电和跨步电压触电。

四、实践与应用题

略

第2章电路的基础知识与基本测量

2.1 电路与电路图

思考与练习

1．电流电源负载传输环节

2．通路断路（或开路）短路电源短路

2.2 电流及其测量

思考与练习

1．正电荷电子流动

2．24A

3．直流电流表直流电流

2.3 电压及其测量

思考与练习

1．1.5V

2．直流电压表直流电压

2.4 电阻及其测量

思考与练习

R×100 电阻调零 1

2.5 部分电路欧姆定律

思考与练习

1．正比反比 R

U I =

2．5Ω 3.6A

2.6 电能与电功率

思考与练习

1．单位时间

2．1210Ω 10W

复习与考工模拟

一、是非题

1．× 2．× 3．√ 4．× 5．√ 6．× 7．× 8．× 9．× 10．√

二、选择题

1．B 2．C 3．B 4．A 5．D 6．B 7．C 8．D

三、问答与计算

1．23.3Ω

2．4.5A 0.25KW

3．595.2度 357.12元

四、实践与应用题

1．（1）一般新电池两端的电压大于1.5V ，而旧电池两端电压小于1.5V 。

（2）万用表测电池两端电压的操作步骤：①选择万用表的挡位与量程。把挡位与量程选择开关打在直流2.5V 挡。②万用表并接在电池两端。万用表的红表笔接电池的正极，黑表笔接电池的负极。③正确读数。

2．略

第3章直流电路

3.1 闭合电路欧姆定律

思考与练习

1A 4V 0.5V

3.2 负载获得最大功率的条件

思考与练习

负载电阻R 等于电源的内阻r r

E P 42max = 阻抗匹配 50% ?? 3.3 电阻串联电路

思考与练习

15 0.2 1 0.4

3.4 电阻并联电路

思考与练习

1. 相等通过各电阻的分电流之和反比反比

2．1：1 1：3 1：3

3.5 电阻混联电路

思考与练习

1. 5Ω

2. 4

3.6 基尔霍夫定律

思考与练习

1. 实际参考实际方向与参考方向相反

2．241I I I =+ 435I I I += 033244111=+---R I E R I E R I

复习与考工模拟

一、是非题

1．× 2．× 3．× 4．√ 5．√ 6．√ 7．√ 8．× 9．√ 10．√

二、选择题

1．B 2．A 3．C 4．C 5． A 6．A 7．B 8．B 9．B 10．B

三、分析与计算

1．1.5A 2.85V

2．1.5Ω

3．串电阻 5Ω

4．66.7Ω 0.6A

5．（1）11=I A 6.02=I A 4.03=I A

（2）8.51=U V 2.132==U U V 1=r U V

（3）8.51=P W 72.02=P W 48.03=P W 1=r P W 8=总P W

6．（1）321I I I =+

（2）0E -R I R I 13311=+ 0R I -E R I -22233=+

7．S 打开时：Ω=6R AB S 闭合时：Ω=3R AB

8．

2.4

9．

四、实践与应用题

略

第4章电容器

4.1 电容器的基本概念

思考与练习

1．能够储存电荷电容器

2． 4103.24-? C

4.2 电容器的参数和种类

思考与练习

1．最大

2．4102? 0.02

4.3 电容器的连接

思考与练习

1．电荷量电压

2．80V 40V 410.63-? C 410.27-? C

4.4 电容器的充电和放电

思考与练习

1．最大逐渐减小等于0 0 最大电源

2．1K

?或Ω电容器内部可能断路电容器内部已经短路R?

100

复习与考工模拟

一、是非题

1．× 2．× 3．× 4．√ 5．× 6．× 7．× 8．√ 9．× 10．√

二、选择题

1．C 2．B 3．C 4．C 5．B 6．A 7．B 8．C 9．D 10．B 三、分析与计算

1．3

? C

2．共需4只电容器，两两串联后再两两并联。

3．（1）0.75μF 250V

（2）电容器要被击穿

四、实践与应用题

略

第5章磁与电磁感应

5.1 磁的基本概念

思考与练习

1．电流的磁效应

2．右手螺旋定则

3．线圈中电流和方向如下图所示。

5.2 磁场的基本物理量

思考与练习

1．磁通密度 B 特斯拉 A B φ=（T ）

2．2．磁感应强度物质的磁导率 μB H =

5.5 磁场对电流的作用

各载流导体的受力方向如下图所示。

5.6 电磁感应

运动导体中感应电流的方向如下图所示。

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A :c B 1-5 baccd 6-8 cdd D.1-5 daaba 6-10 dadca Fast Reading:1 dbcca 2 cbbcd 3 dcdcd Home Reading:abcccbac Unit 2 A:c B 1-5 cdada 6-10 bdacb D 1-5 dcbad 6-10 cbbad 11-15 cabdc Fast Reading:1 bbcad 2 bbbdd 3 cddda Home Reading: abadcadbcd Unit 3 A :c B 1-5 dccad 6-10 ddcaa D 1-5 badcd 6-12 bbcdacb Fast Reading:1 dbacc 2 abdcbd 3 dabc Home Reading:abdccccbab Unit 4 A :c B bdcaab D 1-5 dbacb 6-12 ccdcdcb Fast Reading:1 cdabd 2 cdcdd 3 dccbb Home Reading:bcddcdccdd Unit 5 A: c B 1-5 cacbd 6-10 bdabc D 1-5 abacd 6-10 ababa Fast Reading:1 ddbdb 2 dbddc 3 cdbcd Home Reading:cbdcbaacbd Uint 6 A:a B 1-5 bbbad 6-10 bdddc D 1-5 ccbaa 6-12 dabada Fast Reading:1 cabdd 2 addaa 3 bccdb Home Reading:bcacbbbb Unit 7 A:b B 1-5 cadbd 6-11 abcbad D 1-5 badca 6-14 bcbbadcab Fast Reading:1 cabdb 2 dbbdd 3 dccbd Home Reading:dcdbaccadb Unit 8 A:b B 1-5 badda 6-8 bac D:dacdcabbdab Fast Reading:1 cdbbd 2 dcacb 3 adcab Home Reading:accbdbacdb Unit 9 A:c B 1-5 bdcac 6-8 bcd D:aaabccdacbb Fast Reading:1 bcdda 2 adccd 3 dcbdc Home Reading:bcbadcab Unit 10 A:a B 1-5 acdcb 6-10 dadcc D:aaadbbcdabb Fast Reading: 1 ddccc 2 bbbca 3 cdacc Home Reading:bddcddcba Unit 11 A:c B 1-5 bdbba 6-7 bc D:aabbadab Fast Reading:1 bcbcb 2 ccbdd 3 abccd Home Reading:cdddddbcba

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汪晓寒 location 场所位置 dumb 愚蠢的（foolish）,哑的（toneless） assure 向某人保证（promise）,使确信（guarantee） glorious 极好的（wonderful），辉煌的（splendid），光荣的（completely） exhaust 筋疲力尽，用完 community 社区 committee 交流 fade 渐渐消失，褪色 comtast 持续的，不变的 humiliate 羞辱，使丢脸 simultaneous 同事的 interference 干涉，干扰 keep （sb）in suspense 使产生悬念 talented /gift/ genius 天赋 typical 典型的 consist of / be made up of 由……组成 reversal 颠倒 critical 至关重要的 principal 主要的 initial 最初的 investigate 调查 elementary 基本的 vigorous 用力地，精力充沛的 colleague 同事 creative 独创的 creativity 创造力 originality 独创性 independence 独立 enormous 巨大的，极大的 breakthrough 突破 (一到五单元单词) 1)背离传统需要极大的勇气。(departure，enormous)' It takes an enormous amount of courage to make a departure from the tradition. 3) 很多教育家认为从小培养孩子的创新精神是很可取的。(creative，desirable) Many educators think it desirable to foster the creative spirit in the child at an early age. 5)如果这些数据在统计上是站得住脚的，那它将会帮助我们认识正在调查的问题。 (throw lighton, investigate, valid) If the data is statistically valid, it will throw light on the problem we are investigating.

新标准大学英语综合教程2单元答案

Unit 2Food, Glorious Food Active Reading 1 Reading and understanding 2. Choose the best way to complete the sentences 1. b 2. B. 3. a 4. a. 5. C Dealing with unfamiliar words 3. Match the words in the box with their definition 1. frank 2. resort 3. yummy 4. juicy 5. gloomy 6. innocence 7. perception8. Nonsense 4. Replace the underlined words with the correct form of thewords in the box1 The waves were very large in size as they fell onto the beach. (enormous)2There was so much seafood that it was holding tightly onto the plate. (clinging)3 In the area of land where they were visiting, it wasn ' t usual to eat fish and chips.(region) 4 When he had eaten the shellfish, he got rid of the shells. (discarded) 5 To eat shellfish you need special tools to break open the shells and dig out thefood.(implements; crack; scrape) 6 The boy was especially fond of his mother ' s bread and cakes from theoven.(baking) 7 Because they ' re smooth, wet and quite difficult to hold, it ' s qu challengeto tryyour first oysters. (slippery) 5. Answer the questions about the words in the box. 1 Which word means feeling? (emotion) 2 Which word means a feeling that a situation is so bad that there youcando to change it? (despair)

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Unit1 Listening skills BBDCA Listening in Task1 FTFTF & Listening in Task2 BBDAC Listening in Task3 " classical peaceful relaxing Jazz sadness 】 heavy metal energy sporting events

physical labor road accidents / Let's talk > Task 1 Good Morning to All success musical talents without % second part replaced legal action real owners · Further listening and speaking > Further listening > Task 1 special joke talent proud loud < joy

dancer talk wondered [ capture fan Further listening and speaking > Further listening > Task2 BAADC Further listening and speaking > Further listening > Task 3 TFTTT ！ Unit 1 test . Golden oldies . She is not familiar with the music they are listening to . Fast music can give people energy according to the man . They both think the tickets are expensive . The woman probably moved in not long ago band anymore - longer

英语泛读教程2-王守仁-答案

4That takes me back to the time I climbed to the top of Mount Fuji. 5The members of the party took it in turns to steer the boat. 6They took it for granted that someone would pick up their signals and come to their aid. Stems 7proclaim: to announce officially and publicly; to declare 8percentage: a proportion or share in relation to a whole; a part 9confirm: to support or establish the certainty or validity of; to verify 10affirm: to declare positively or firmly; to maintain to be true 11centigram: a metric unit of mass equal to one hundredth of a gram 12exclaim: to express or utter(something) suddenly or vehemently Synonyms