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江苏省五年一贯制专转本晓庄电工考卷

江苏省五年一贯制专转本晓庄电工考卷
江苏省五年一贯制专转本晓庄电工考卷

2016年江苏省五年一贯制专转本晓庄电工

一、填空题

1.在物理学中,习惯上规定_________电荷定向移动的方向为电流的方向。 2.KVL 定律应用于_________,而KCL 定律应用于_________。 3.下图一中二源网络中的Is 为_________,R=_________。 图一

4.戴维南定理中,求等效电阻时,需要进行处理,方法是:电压源_________电流源_________。

5. 1.表征正弦交流电振荡幅度的量是它的_________;表征正弦交流电随时间变化快慢程度的量是_________;表征正弦交流电起始位置时的量称为_________。三者称为正弦量的_________。

6.在RLC 串联电路中,已知电流为5A,电阻为30Ω,感抗为40Ω,容抗为80Ω,那么求电阻抗为 ,该电容为 性电路。电路中吸收的有用功率为 ,吸收的无工功率又为 。

7. 一阶电路的全响应,等于其 和 之和; 一阶电路全响应三要素法:。

8.若一单相交流电路中I1=40A ,I2=30A ,并联的总电流I=70A ,则电路电流角度差为 。

9.电阻元件上任一瞬间的电压电流关系可表示为u = iR ;电感元件上任一瞬间的电压电流关系可以表示为( );电容元件上任一瞬间的电压电流关系可以表示为( )。

10.求图二中ab 间的等效电阻为 。 图二

电源

V 8

a

二、选择题

1.图三中I1=2A,I2=3A,I4=1A,则I3、I5分别等于多少?( )

A.-1,1

B.1,-1

C.-2,1

D.1,-2

2.图4直流电路中U( )

A. 5V

C. -5

图4

3.有四种不同规格的白炽灯,分别为220V100W;220V200W;220V30W;220V10W,这四种灯泡中电阻最小的是?( )

A. 220V100W

B. 220V200W

C. 220V30W

D. 220V10W

4.当在电路中使用支路电流法的时候,需要多少个KVL、KCL方程?( )

A. n+1,b-n+1

B. n-1,b-n-1

C. n-1,b-n+1

D. n+1,b-n-1

5.万用表测得电路的数值是什么值?( )

A. 最大值

B. 有效值

C. 额定值

D.最小值

6.若一串联电路中R=30Ω,XL=40Ω,Xc=80Ω,问阻抗等于______Ω?电阻呈______性?( )

A.50,容

B.55,容

C.50,感

D.55,感

7.提高供电线路的功率因数,下列说法正确的是?( )

A .减少了用电设备中无用的无功功率.

B .可以节省电能.

C .减少了用电设备的有功功率,提高了电源设备的容量.

D .可提高电源设备的利用率并减小输电线路中的功率损耗。

8.电路如图5所示,已知R=R 1=R 2=10Ω,L=31.8mH ,C=318μF ,f=50Hz ,U=10V ,试求并联支路电压U ab 。 ( ) A. 5V B. -5V C. 4.5V D. -4.5V

9.下图6

( ) A. C.吸收功率,发出功率 D. 发出功率,吸收功率 图6

10,在电路图7中的参考方向下,正确的KVL 表达式为? ( )

图7

11.根据图8,下列哪个表达式正确? ( )

≈-0.20 ≈-0.58 ≈-0.85 ≈0.44

三、解答题

1.根据图9,用戴维南定理求出I 电流的大小,且画出等效电路图?

R

b 1A

2.5Ω

b

图9 2.根据图10,用支路电流法求出各支路的电流?

图10

3.电路如图11所示,在换路前已处于稳态。当开关从位置1合到位置2后,试求i L 和i 。(真实题电容与电阻并联)

图11

4.在图12所示电路中,电源u AB =380sin314t+30o ,频率f=50Hz ,Z A 是一个220V/40W 的白炽灯,Z B 是两个并联的220V/40W 的白炽灯,Z C 阻抗为40Ω且功率因数cos α=0.5,(1)求每项电流u A 、u B 、u C 、N 分别为多少?(2)若N 断开,Z C 短路则每相电压是?元件是否能正常工作?

部分答案

一、填空题

5. 1.表征正弦交流电振荡幅度的量是它的___最大值______;表征正弦交流电随时间变化快慢程度的量是 角频率 ;表征正弦交流电起始位置时的量称为 初相 。三者称为正弦量的 三要素 。

6.在RLC 串联电路中,已知电流为5A,电阻为30Ω,感抗为40Ω,容抗为80Ω,那么求电阻抗为 50Ω ,该电容为 容 性电路。电路中吸收的有用功率为 750W ,吸收的无工功率又为 1000var 。

7. 一阶电路的全响应,等于其 稳态分量 和 暂态分量 之和; 一阶电路全响应三要素法:

8.若一单相交流电路中I1=40A ,I2=30A ,并联的总电流I=70A ,则电路电流角度差为 0

8Ω2V 3Ω

14V 2Ω

+-I1

I3

I2

9.电阻元件上任一瞬间的电压电流关系可表示为u = iR ;电感元件上任一瞬间的电压电流关系可以表示为();电容元件上任一瞬间的电压电流关系可以表示为

)。

10.求图二中ab 间的等效电阻为 。 图二

二、选择题

1.图三中I1=2A ,I2=3A ,I4=1A ,则I3、I5分别等于多少?( B ) A.-1,1 B.1,-1 C.-2,1 D.1,-2

图三

2.图4直流电路中U 的值为? ( A )

A. 5V

B. 6V

C. -5

D. -6 图4

3.有四种不同规格的白炽灯,分别为220V100W ;220V200W ;220V30W ;220V10W ,这四种灯泡中电阻最小的是? ( B ) A. 220V100W B. 220V200W C. 220V30W D. 220V10W

4.当在电路中使用支路电流法的时候,需要多少个KVL 、KCL 方程? ( C )

A. n+1,b-n+1

B. n-1,b-n-1

C. n-1,b-n+1

D. n+1,b-n-1

5.万用表测得电路的数值是什么值? ( B ) A. 最大值 B. 有效值 C. 额定值 D.最小值

a

b I5I3I4I2

6.若一串联电路中R=30Ω,XL=40Ω,Xc=80Ω,问阻抗等于______Ω?电阻呈______性? ( A ) A.50,容 B.55,容 C.50,感 D.55,感

7.提高供电线路的功率因数,下列说法正确的是? ( D) A .减少了用电设备中无用的无功功率. B .可以节省电能.

C .减少了用电设备的有功功率,提高了电源设备的容量.

D .可提高电源设备的利用率并减小输电线路中的功率损耗。

8.电路如图5所示,已知R=R 1=R 2=10Ω,L=31.8mH ,C=318μF ,f=50Hz ,U=10V ,试求并联支路电压U ab 。

A. 5V

B. -5V

C. 4.5V

D. -4.5V

9.下图6

( D ) A. C.吸收功率,发出功率 D. 发出功率,吸收功率 图6

10,在电路图7中的参考方向下,正确的KVL 表达式为? (D)

图7

11.根据图8,下列哪个表达式正确? (A )

≈-0.20 ≈-0.58

R

b 1A

2.5Ω

b

≈-0.85

≈0.44

图8

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2017 年春五年一贯制高一英语期 Name ________ Scores _______ 一、阅读理解共30 分,每2 分) Passage 1 Hawaii is a truly beautiful place. Most people know Hawaii for its lovely beaches. However, Hawaii is also a land full of legends( 传). One of the oldest legends tells of a special dance called the hula, which started here around 300years ago. One hula teacher tells the story of how the dance started. “The hula started, as far as the legend tells it, when Hi ’iaki and her good friend Hopoe went down to the beach. And t h h e e n n, w they were there, they noticed the waves ?i m a i t n a d t e t d h e t h y e waves. And then started to use their hands ?like showing the waves. That is how the hula started. ” However, not everyone has always liked the hula. In 1820,some religious people from Western countries came to Hawaii. The visitors were shocked by the hula because the dancers were not wearing many clothes. So they asked the local government to banthe dance. After that, most Hawaiians were not allowed to perform the hula in public for almost 60 years. But that did not mean the dancing stopping stopped. Many dances still performed the hula in secret. The dance was always there. Things have changed. At the moment, people of all ages want to study the old culture. They want to learn how to dance the hula. As a result, more and more people are attending halaus. Halaus are special schools that hula in the traditional way. Kumano is a hula teacher. For him, the dance is a way to bring the best of old Hawaii culture to people today. Kumano says that the dance is not really about the body. He feels that it is more about the mind. He explains this feeling , ”?the hula is more ?not so much a physical thing, but more of a mental thing. For new dances, the dancing means very little, because for Hawaiians today, many of th em don t speak the Hawaiian language. So, what I try to do is to mind the real thing they see today. ” 1. Which of the following has the closest meaning to the underlined word ”imitated in”t his passage? ” A. Absorbed B. Chased. C. Recorded. D. Copied. 2. Why was the hula banned for almost 60 years? A. Because the local government found the movements of the dance were rude. B. Because the religious visitors thought that the dances did not dress properly. C. Because the dances realized it was not suitable to perform the dance in public. D. Because the Hawaiian people believed the dance was not in fashion any more. 3. What can we learn from the passage? A. Hi iaki and her good friend Hopoe got the idea of the dance from nature. B. The hula had already had a history had a history of over 200 years when it was banned. C. Many people attend hulaus because they teach the hula in a modern way. D. Kumano thinks that the hula dance is good exercise for people of all ages. 4.How do we understand that Kumano tries to bring to mind the real thing they today? A. He tries to help young Hawaiian understand the old culture better. B. He tries to let new dances feel the beauty of the Hawaiian language.

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