CCS+UT2级考试真题200705
CCS 超声波 II 级理论考题答案(2007.5旅顺)
一. 选择题(每选2分,共70分)
1. 超声波的波长: λ=C/f ,又f=1/T(周期).周期:完成一个全振动所需时间.
A ．与介质的声速和频率成正比；
B ．等于声速和频率的乘积；
C ．等于声速与周期的乘积； D.与声速和频率无关．
2.超声波入射到异质界面时,可能发生: A ．反射； B ．折射； C ．波型转换； D.以上都可能．
3.下列直探头，在钢中指向性最好的是
o D o C o B D 58.418
5/9.570;16.5204/70;8.9143/9.57070=======θθλ
θ A ．2.5P20Z ； B ．3P14Z ； C ．4P20Z ； D.5P18Z ．
4.超声波的扩散衰减主要取决于: A ．波阵面的几何形状；B ．材料的晶粒度； C ．材料的粘滞性； D.以上全部．
5.外径为D,内径为d 的空心圆柱体,以相同的灵敏度在内壁和外圆探测,如忽略耦合差异,则底
波高度比为: D
d x F P P d D x F p P D B D B λλ2:;2:00==外内外壁探内壁探 d
D d D D d
d D P P B B ===22外内 A ．1； B ．(D/d)1/2； C ．((D-d)/2)1/2； D. D/d ．
6.聚焦探头声透镜曲率增大时,透镜聚焦变化为: A ．增大； B ．不变； C ．减小； D.无规律．
见书P.193 F=2.2r 当声透镜曲率增大时,其曲率半径减小,从公式可知F 减小,即透镜聚焦减小.
7.超声波检测系统的盲区是指A ．主声束扫描不到的区域； B ．近场内距离；
C ．1.6N 区域； D.被始脉冲宽度覆盖区所代表的距离．
8.复合材料探伤,由于两介质声阻抗不同,在界面处有回波出现,为了检查复合层结合质量,下
列哪条叙述是正确的: A.两介质声阻抗接近,界面回波小,不易检查；
B.两介质声阻抗接近,界面回波大,容易检查;
C.两介质声阻抗差别大,界面回波大,不易检查;
D.两介质声阻抗差别大,界面回波小,容易检查
9.在超声波检测中一般不允许使用”抑制”旋钮,其原因是: A ．使仪器垂直线性变化； B ．动态范围变小；
C ．灵敏度降低； D.以上全部．
10.超声波检测系统的灵敏度取决于: A ．探头、高频脉冲发生器和放大器性能； B ．同步发生器性能；
C ．仪器的重复频率; D.仪器的阻塞特性.
11.在探测条件相同的情况下,直径比为2的两个实心圆柱体,其曲底面回波相差:
实心圆柱体曲底面回波与大平底回波规律相同
dB x D P x D P P P B B 62lg 202
14214lg 20lg 2022012021==??=λπλπ A ．12dB ； B ．9dB ； C ．6dB ； D. 3dB.
12.超声波检测系统的盲区大小受下列哪些因素影响:
A ．系统的发射强度；
B ．调节灵敏度；
C ．仪器阻塞特性； D.以上均是.
13.探头软保护膜和硬保护膜相比,突出的优点是:
A ．透声性好；
B ．材质衰减小；
C ．有利消除耦合差异；D.以上均是.
14.超声波检测系统组合性能的常用指标为:
A ．水平和垂直线性；
B ．灵敏度余量和动态范围；
C ．噪声电平和分辨力V 型槽; D.灵敏度和盲区; E 以上均非．
15.在厚板焊缝检测用试块中,人工反射体一般应选:
A ．短横孔；
B ．长横孔；
C ．横通孔； D.以上均可.
16.直探头纵波探伤时,工件上下表面不平行会使底波变化,结果是
: A ．底波降低甚至消失;B ．底波变宽； C ．底波变窄； D.以上均非.
17.超声波检测中下列哪种参考反射体与入射声束角度无关
: A ．平底孔； B ．平底槽； C ．V 型槽； D.横孔.
18.超声波检测常规方法中,可检测的缺陷尺寸一般认为不小于:
见书P.85倒一行
A ．波长的1/4；
B ．波长的1/3；
C ．波长的1/2； D.以上均非.
19.
在脉冲反射法探伤中,可根据什么判断缺陷的存在: A ．缺陷回波； B ．底波或参考回波的减弱或消失；
C ．接收探头接收到的能量的减弱; D.A 和B 都对．
20.板厚T=150mm 的钢板,
作周边超声波检测时,周边扫查范围一般为: A ．50mm ； B ．75mm ； C ．150mm ； D.按标准规定.
21.焊缝检验中,对一缺陷环绕扫查,
其动态波形包络线是方形的,则缺陷性质可估判为: 见书P.96动态波形图.
A ．条状夹渣；
B ．气孔或圆形夹渣；
C ．裂纹； D.以上A 和C.
22.
在焊缝斜探伤中,哪种看法是错的: A ．一般来说,根部未焊透,反射波高度比气孔高；
B ．用单斜探头直射法探伤时,内部未焊透的反射波高度往往很低；
C ．裂纹因为是平面状缺陷,所以反射波总是很高；
D. 未溶合缺陷，两侧探伤具有不对称性.
23.锻件接触法探伤中,如果探伤仪的”
重复频率”调得过高,可能发生A ．荧光屏”噪声”信号过高； B ．时间线倾斜；
C ．始脉冲消失； D.容易出现”幻想波”.
以下试题按照《CCS 无损检测人员资格认证规范》(2000)的有关要求进行选择
: 24.陆上各类各级无损检测人员资格证书的有效期为: A ．3年； B ．4年； C ．5年.
25.拟更新证书的持证人,
应向考试中心提出证书更新的书面申请,一般为:
A．证书有效期满前6个月；B．证书有效期期满之前；
C．证书有效期期满之后; D.随时．
26.某操作人员取得UT I级证书,现领导安排其按高级人员制定的工艺规程并在II级人员的指导下进行检测工作,同时独立负责对仪器定时检查水平线性、垂直线性等仪器检查工作.问
领导的工作安排是否合适?
A．合适；B．不合适.
以下试题按照CB/T3559-94的有关要求进行选择:
27.按CB/T3559标准要求,探伤仪与斜探头组合分辨力(Z值)在CSK-IA或STB-A2试块上的
φ1.5×4两孔测定,其Z值应: 标准4.4
A．>6dB; B．>15dB；C．≤6dB; D.≤15dB; E.无规定．
28.每格2分) 标准4.2 A．0.5%；B．1%；C．2%； D.3%; E.5%.
29.标准4.3
A．>1；B．>2；C．≤1； D. ≤2; E.无规定.
30.母材板厚25mm,标准7.1
A．1～4MHz；B．2～5MHz；C．3～6MHz； D.4～7MHz.
31.时基线调节时,最大检测距离至少调整到示波屏基线满刻度的标准8.2
A．50%；B．75%；C．80%； D.90%.
32.CB/T3559标准规定,初探伤灵敏度为: 标准12.1
A．不低于MRL线；B．不低于ARL线；C．不低于DRL线；D.不低于φ3线.
33.若缺陷回波位于DRL线和MRL线之间,有一个峰幅,测长应采用什么方?: 标准13.4.2 A．6dB相对灵敏度法； B. 端点峰值降低6dB相对灵敏度法；C．MRL线绝对灵敏度法； D. 端点峰值降低MRL线绝对灵敏度法. 34.根据缺陷的波高和指示长度及分布状态,焊缝质量可分为Ⅰ～Ⅴ级,当缺陷回波高于ARL
线时均应评为: 标准15.2
A.Ⅰ级;
B.Ⅱ级;
C.III级;
D.Ⅳ级;
E.Ⅴ级.
(注:选择题与2006.05旅顺考题同21题)
二.简答题(共10分)
1.何谓超声波检测灵敏度?通常调节超声波检测灵敏度的方法有哪几种?(5分)
答:超声波检测灵敏度是指在确定的探测范围的最大声程处发现规定大小缺陷的能力。而在具体操作中是要求：按标准或技术条件规定的检验灵敏度要求为依据,将与该要求对应的人工反射体（指定类型、大小和声程）最高回波调到基准波高（如80%），则检测灵敏度符合要求。
调节检测灵敏度的方法有：
⑴试块调整法：将与检测灵敏度要求对应的试块上人工反射体最高回波调至基准波高（如80%），则检测灵敏度就调好(当试块与试件的表面耦合和材质衰减有差异时,需在调节灵敏度时考虑此表面耦合和材衰差的dB值)；
⑵试件底波调整法：根据声压公式计算的试件底面回波与同深度人工反射体（如平底孔）回波的分贝差（ΔdB），将试件底面回波先调至准波高度（如80%），再增益ΔdB，则灵敏度调好；
⑶距离-波幅曲线调整法：根据标准规定在相应试块上作出距离-波幅曲线，再将标准规定的人工反射体（如船标规定为φ3-16dB ）的最高回波调至基准波高（如船标规定调至测长线），再加上试件与试块的表面耦合补偿dB 值，则检测灵敏度调好。
2.简述钢板探伤时引起底波消失的几种可能原因?(5分)
答：⑴探伤灵敏度调的太低；
⑵探头耦合不好（钢板表面有氧化皮和浮锈，钢板表面太粗糙等）； ⑶探头损坏；
⑷探头线断路；
⑸仪器接收电路有故障；
⑹钢板晶粒粗大；
⑺钢板中有严重的密集缺陷；
⑻钢板中存在大于声束截面的缺陷；
⑼钢板底面太粗糙或锈蚀严重。
三.计算题(共20分)
1.试计算5P14SJ 探头,在水中(C L =1500m/s)的指向角和近场长度?(5分) 解：mm f C 3.05
5.1===λ ?=?==5.114
3.070700D λ
θ mm D N 1633
.041442
2=?==λ 答：5P14SJ 探头在水中的指向角为1.5°, 近场区长度为163mm 。
2.对钛钢复合板,在复合层一侧作接触法检测.已知钛与钢的声阻抗差约为40%,试计算复合层界面回波与底波相差多少dB?(5分)
解:设钢的声阻抗为Z 2=1,则钛的声阻抗为Z 1=0.6.
25.06
.016.011212=+-=+-=Z Z Z Z r p dB r r p p p p s B 5.1125
.09375.0lg 20|1|lg 20lg 202==-==? 答:复合层界面回波与底波相差11.5dB 。
3.用2.5P20Z 直探头检测厚度为300mm 的钢锻件(C L =5900m/s),衰减
系数α=0.01dB.
(1) 如用试块(衰减可忽略)上的深200mm,φ=4mm 平底孔调节探伤灵敏度(φ=2mm),两者波高dB 差为多少?(5分)
(2) 如用厚度为200mm 的试块(锻件与试块衰减相同,但耦合差5dB)底波,如何调节探伤灵敏度?(5分)
解：A. 36.25
.29.5===f C λ mm D N 4.4236
.242042
2=?==λ 3N ＝127.2＜200 故可用声压公式计算:
dB X X X X X X dB f j f j f j j f 252000230001.02200
23004lg 4022200
23004lg 40)(2lg
40=??-??+??=-+??=-+=?试工αααφφ 答：两者的波高相差25dB 。
B. dB X X X X p p dB B f B f f B 4710001.02200
214.330036.22lg 20)(22lg 20lg 2022212=??+????=-+==?απφλ
ΔdB 2 = 5dB
ΔdB=ΔdB 2+ΔdB 1=52 dB
答：将试块底波调节至基准波高（如80%），再增益52 dB ，则灵敏度符合要求。
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C. I think I do. D. what else Dialogue Two Speaker A: I just recently moved into the neighborhood. Speaker B: __5__ How recently Speaker A: Just last week. Speaker B: What kinds of things have you been doing out there Speaker A: __6__ Speaker B: why not Speaker A: I don't know what to do. Speaker B: There're all sort of things to do. Speaker A: __7__ Speaker B: Shopping, or seeing a movie, or even going to the beach. Speaker A: That sounds great. A. I haven't been doing much. B. Really C. How are you doing D. Like what Dialogue Three
学位英语试题和答案
考试须知 1、本次考试试卷有试题册（试卷一）和答题纸（Answer Sheet)两种，答题时间 为120分钟。 2、请考生用钢笔在Answer Sheet上写上、学号、专业班级。 3、请考生在Answer Sheet上答题，写在试题册上的答案一律作废。 4、选择题每题只能选一个答案，多选作废。选定答案后，在Answer Sheet中找到相应题号，将答案对应字母（A\B\C\D）填写在题号后的括号里。注意保持字迹清晰工整，容易识别。由于字迹潦草、答案模棱两可甚至无法识别者，一律判为0分，责任由考生本人负责。 5、简答题、翻译和作文等主观题部分的答题请考生用钢笔书写在Answer Sheet 指定位置上。 6、考试结束，考生不得将试题册和答题纸带出考场。请把试题册和答题纸分别 上交监考老师。 Test 15 Part I. Situational Conversations (10%) Directions:In this part, there are ten short incomplete dialogues between two speakers, each followed by four choices marked A, B, C and D. Choose the one that most appropriately suits the conversational context and best completes the dialogue. Mark your answer on the ANSWER SHEET with a single line through the center of the corresponding letter． 1. Vivian: Christina! I haven’t seen you for ages. How are you? Christina: Fine. And you? Vivian: Pretty good. How’s Christopher? Christina: Oh, don’t you know? We got divorced two years ago. Vivian: __________ A. Hope you’ll be better. B. It is really a problem. C. What a pity! D.Oh, I’m sorry. 2. Richard: How much is it to rent an economy car? Tina: $15.00 a day or $95.00 a week, unlimited mileage. Richard: Could I have one for tomorrow morning? Tina: ___________________________ Richard: Sure. Here it is.
学位英语考试练习题(四)
学位英语考试练习题（四） Part I Reading Comprehension A teddy bear is delivered to No. 10 Downing Street after the birth of Prime Minister Tony Blair and wife Cherie’s fourth child. Britain’s baby alert is over-Cherie Blair gave birth to a boy. Mrs. Blair, 45, wife of Prime Minister Tony Blair, had the baby this morning. The baby will be named Leo after the prime minister’s father, his office announced, the baby weighed in at 6 pounds, 12 ounces. Mother, father and the baby boy returned to 10 Downing Street-the prime minister’s official residence-after the birth, a spokesman said. The baby is the couples’ fourth child. “Cherie and the baby are absolutely fine,” Blair said today outside his Downing Street residence. “He is a gorgeous little boy. They are resting right now.” Blair, dressed casually in an open shirt, appeared emotional about the birth, the first of his four children whose birth he has been at from beginning to end. “this is the first time I’ve seen the whole thing though,” he said. “it was quite a struggl e, really, for Cherie.” The switchboard was reportedly lit up with calls from world leaders wishing them well, including a call from Hillary Colliery Clinton. Former prime minister John Major was the first public figure to get through on the phone at 7 a.m. on Saturday. The baby came after a 12-year gap from the Blairs other three children-Euan, 16, Nicky, 14, and Kathryn. He is the first to be born to a serving Buitish prime minister in over 150 years. News of the pregnancy took Cherie and the rest of the nation by surprise when it was announced last year. After decades of much older occupants at No.10 Downing Street, the Blairs’ arrival at the prime minister’s residence with their children and assorted toys in tow was hailed as a breath of fresh air.
广东省学位英语历年真题及答案
I. 会话技能15道15分15分钟 II. 阅读理解20道40分40分钟 III. 词汇和语法40道20分25分钟 IV. 完形填空10道10分10分钟 V . 短文写作100～120个词15分30分钟 考试总时间：120分钟 2011年广东学位英语考试试题及答案 PartⅠVocabulary and Structure (25 points, 30 minutes) Directions: There are 50 incomplete sentences in this part. For each sentence there are four choices marked A), B), C) and D). Choose the ONE answer that best completes the sentence. Then mark the corresponding letter on the Answer Sheet with a single line through the center. 1. By 1929, Mickey Mouse was as popular ____ children as Coca Cola. A) for B) with C) to D) in 2. When you buy anything expensive, never forget to ask for the ____ from the shop. A) receipt B) trust C) render D) tale 3. The financial support is decided not only according to your GRE score, but also according to your ____ in college. A) intelligence B) policy C) performance D) statement 4. Professor Smith is also the ____ of the international program office. If you have any problem when you study here, you may go to him for help. A) detective B) president C) manager D) director 5. We do not have a ____ school in our institute. The highest degree we
学位英语考试练习题
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8. Hardly _____ I got home when it began to rain. A. had B. am C. did D. that 9. _____ ,none of us wanted to take a rest. A. Tired although we were B. Tired as we were C. As we were tired D. We as were tired 10. She opened the door quietly _____ wake up her sleeping baby. A. in order that B. so that C. in order to D. so as not to 11. It was my grandfather _____ helped mike mend his bike this morning. A. that B. whom C. which D. what 12. It was this morning _____ my grand father helped mike mend his bike this morning. A. that B. whom C. when D. which 13. It was because it rained heavily last night _____ he didn’t come to the evening school. A. that B. so that C. so D. when 14. Air, or _____ is called atmosphere, surrounds the whole earth. A. it B. that C. which D. what 15. In short, _____ he lives, a man belongs to some society. A. whatever B. whenever
2011年学位英语考试真题(附答案)
2011年学位英语考试试题 PartⅠ V ocabulary and Structure (25 points, 30 minutes) Directions: There are 50 incomplete sentences in this part. For each sentence there are four choices marked A), B), C) and D). Choose the ONE answer that best completes the sentence. Then mark the corresponding letter on the Answer Sheet with a single line through the center. 1．By 1929, Mickey Mouse was as popular ____ children as Coca Cola. A) for B) with C) to D) in 2．When you buy anything expensive, never forget to ask for the ____ from the shop. A) receipt B) trust C) render D) tale 3．The financial support is decided not only according to your GRE score, but also according to your ____ in college. A) intelligence B) policy C) performance D) statement 4．Professor Smith is also the ____ of the international program office. If you have any problem when you study here, you may go to him for help. A) detective B) president C) manager D) director 5．We do not have a ____ school in our institute. The highest degree we provide for the students is a B. A. and a B. S. . A) graduate B) high C) grade D) continue 6．Paper clips, drawing pins and safety-pins were ____ all over the floor. A) separated B) sprayed C) spilled D) scattered 7．I am writing ____ my mother to express her thanks for your gift. A) in memory of B) on behalf of C) with respect to D) on account of 8．In considering men for jobs in our firm, we give ____ to those with some experience. A) privilege B) advice C) prize D) preference 9．She is ____ a musician than her brother. A) much of B) much as C) more of D) more as 10．The assignments are too hard. I can't ____ the work. A) keep up with B) catch up with C) come up with D) put up with 11．Robert Spring, a 19th century forger, was so good at his profession that he was able to make his living for 15 years by selling ____ signatures of famous Americans. A) artificial B) genuine C) false D) natural 12．In 1890 there were many American cities and towns where part of a day's school instruction was conducted in language ____ English. A) more than B) other than C) except that D) except for 13．The problem will be discussed at length in the ____ Chapter. A) consequent B) latter C) late D) subsequent 14．They are members of the club by ____ of their great wealth. A) virtue B) way C) means D) word 15．The value of the industrial ____ dropped from about 70 billion dollars to slightly more than 31 billion. A) outcome B) outlook C) output D) outset 16．Scientists believe that color blindness is a(n) ____ defect, and there is no cure for it. A) retained B) inherited C) received D) infected 17．She was glad that her success would ____ for the women who would follow.
学位英语考试真题及答案解析
学位英语考试真题及答 案解析 Document number【SA80SAB-SAA9SYT-SAATC-SA6UT-SA18】
B. Duality C. Arbitrariness D. Displacement 2. ()distinguishes the linguistic competence of the speaker and the actual phenomena or data of linguistics as langue and parole. A. Chomsky B. Saussure C. Gilman D. Brown 3. ()is the study of the characteristics of language varieties, the characteristics of their functions and the characteristics of their speakers as these three constantly interact and change within a speech community. A. Psycholinguistics B. Sociolinguistics linguistics linguistics words such as "smog" and "brunch" are called (). A. abbreviation
B. acronym C. back-formation D. blending example, the word" bead" originally means "prayer", but later it refers to "the prayer bead", and finally "small, ball-shaped piece of glass, metal or wood" .It is called (). shift 6. ()there is fresh air, there is oxygen. A. Wherever C. Unless factory operated ()until the order was filled. times the minute by day the clock working for the firm for ten years, he finally ()the rank of deputy director. A. achieved B. approached
学位英语考试真题及答案
2014年学位英语考试真题及荅案+Q/(314521565) Part II Vocabulary and Structure (30%) Directions: In this part there are 30 incomplete sentences. For each sentence there are four choic es marked A, B, C and D. Choose the ONE answer that best completes the sentence. Then mark th e corresponding letter on the Answer Sheet with a single line through the center. 16. Today books are ___ to everyone because they are no longer expensive. A. available B. preferable C. reliable D. actual 17. We shall ask for samples ___ and then we can make our decision. A. to be sent B. being sent C. to sent D. to have been sent 18. The forest fire caused by the vo lcano is difficult to be ___. A. put off B. put away C. put out D. put up 19. It was not ___ midnight that they discovered the children were not in their beds. A. before B. at C. after D. until 20. The girl is not happy at the new school. She has ___ friends there. A. few B. a few C. little D. quite a few 21. Robots have already ___ human tasks in the industrial field. A. taken on B. taken out C. taken up D. taken over 22. I can‘t find the recorder in the room. It ___ by somebody. A. must have taken B. may have taken C. may have been taken D. should have been taken 23. He took the medicine, but it didn‘t hav e any ___. A. answer B. cause C. effect D. work 2014年学位英语考试真题及荅案+Q/(314521565) 24. It is ___ that over one million Americans now live below the poverty line. A. judged B. estimated C. calculated D. considered 25. He left ___ an important detail in his ac count. A. off B. over C. behind D. out 26. When there are small children around, it is necessary to put bottles of pills out of ___. A. hand B. hold C. place D. reach 27. I hadn‘t seen him for years, but I ___ his voice on the telephone. A. realized B. discovered C. recognized D. heard 28. This place, originally a small town, has b een ___ into a modern city. A. transported B. transferred C. transmitted D. transformed 29. There was nobody ___ when we came round the corner. A. out of sight B. at sight C. by sight D. in sight 30. We‘ll be only too glad to attend your party ___ we can get a baby-sitter. A. so far as B. provided that C. unless D. except that 31. They couldn‘t ___ him of his mistake. A. advise B. convince C. persuade D. believe 32. The old gentleman never fails to help ___ is in need of his help. A. whom B. who C. whoever D. whomever 33. ___ under a microscope, a fresh snowflake has a delicate six-pointed shape. A. Seeing B. Seen C. To see D. To be seen 16. By the end of last week 611 people from 49 countries _____ to attend the