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2016年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考卷
2016年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

电源

V

8

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?( ) 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. 5V B. 6V C. -5 D. -6

图4

a

b

I5I3

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

图5

9.下图6电路中哪个是电压源、电流源分别是吸收功率,还是发出功率? ( ) A.吸收功率,吸收功率 B.发出功率,发出功率 C.吸收功率,发出功率 D. 发出功率,吸收功率

10,在电路图7中的参考方向下,正确的KVL 表达式为? (

)

图7

R

b R

L

+Uc -

U a

b

11.根据图8,下列哪个表达式正确? ( )

A.0.9Ua-0.4Ub ≈-0.20 A.0.7Ua-0.5Ub ≈-0.58 A.0.3Ua-0.6Ub ≈-0.85 A.0.7Ua-0.3Ub ≈0.44

图8

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?

图9 2.根据图10,用支路电流法求出各支路的电流?

图10

18V +-3Ω6Ω

2V Ω

I1I3

1A

2.5Ω

b

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?

i L

U A

A

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

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

a

b

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

I5I3

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

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

图5

9.下图6电路中哪个是电压源、电流源分别是吸收功率,还是发出功率? ( D ) A.吸收功率,吸收功率 B.发出功率,发出功率 C.吸收功率,发出功率 D. 发出功率,吸收功率

R

b

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 )

A.0.9Ua-0.4Ub ≈-0.20 A.0.7Ua-0.5Ub ≈-0.58 A.0.3Ua-0.6Ub ≈-0.85 A.0.7Ua-0.3Ub ≈0.44

图8

R

L

+Uc -

U a

b

1A

2.5Ω

b

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2013年江苏省普通高校“专转本”英语统一考试试卷 Part I Reading Comprehension (共20小题,每小题2分,共40分) Directions: There are 4 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are 4 choices marked A, B, C and D. You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the center. Passage One Questions 1 to 5 are based on the following passage. When Mrs. Joseph Groeger died recently in Vienna, Austria, people asked the obvious question. “W hy did she live to be 107?” Answers were provided by a survey conducted among 148 Viennese men and women who had reached the age of 100. What was surprising was that the majority had lived most of their lives in cities. Although cities are often regarded as unhealthy places, city living provides benefits that country living may lack. One factor seems to be important to the longevity(长寿) of those interviewed. This factor is exercise. In the cities it is often faster to walk short distances than to wait for a bus. Even taking public transportation often requires some walking. Smaller apartment houses have no elevators, and so people must climb stairs. City people can usually walk to local supermarkets. Since parking spaces are hard to find, there is often no choice but to walk. On the other hand, those who live in the country and suburbs do not have to walk every day. In fact, the opposite is often true. To go to school, work, or almost anywhere else, they must ride in cars. 1.The Vienna survey may help to explain __________. A.the complaints of people in apartment houses B.the causes of Mrs. Groeger’s death C.the longevity of people like Mrs. Groeger D.the image of cities in general 2.The second paragraph lists some ___________. A.disadvantage of walking B.occasions for walking in city life C.problems of city living https://www.doczj.com/doc/4b3907209.html,ments made by city people 3.To reach the third floor of a building, it would probably be most healthful ___________. A.to take the elevator B.to walk up the stairs C.to ride in a car D.to find an alternative walking 4.People who live in the country usually do more driving than walking because ___________. A.they don’t live near business areas B.they don’t need exercise C.they don’t like walking D.they can’t afford to take the bus

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