长沙理工《电路》的考研模拟试题一

考研模拟试题（一）

一．列写下图所示直流电路的节点方程 ,并求出两个独立电流发出的功率。（20分）

二．如图所示的正弦电路，已知当I1 =I2 =I，R2 =10Ω，ωM =10Ω时，虚线框

内的并联电路达到谐振，求此时的R

1，X

。（20分）

三．电路如图3所示，已知双口网络N的传输参数矩阵，试求负载电阻R

为何

值时,R

获得最大功率，并求此最大功率。（20分）

四．电路如图所示N为线性含源网络，已知i

s =8A , u

=12V时，响应U

=80V；i

- 8A ,u

s =4V时，响应U

=0V；当i

=0A , u

=0V时，响应U

= -40V。求当i

=10A ,

u s =20V时,响应U

为多少。（20分）

五、正弦稳态电路如图5所示，试求图中电流I。(20分)

六、如图6所示，开关S在t=0时闭合，开关闭合前电路为零初始状态，试用拉普拉斯变换求t≥0时的电流i

(t) 。(20分)

七．电路如图7，已知双口网络的传输参数，求负载R

为何值时吸收最大功率

。(15分)

并求出最大功率P

max

八．求图8所示二端口网络的Y参数，并做出π形等效电路。（15分）

考研模拟试题（二）

一、填空题：（每空7分，共56分）

1. 图1-1所示电路中，1A电流源发出的功率( )。

2. 图1-2所示电路中，电压源的电流i为( )A ，电流源的电压u为( )V 。

3. 在图1-3所示对称三相电路中，电流表读数均为1A（有效值），若因故发生A相短路（即开关闭合）则电流表A1的读数为( )，A2的读数为( ) 。

4. 图1-4所示电路处于谐振状态，已知Is=1A，U1=50V，则电阻R2=( )Ω,电感电压U L=( )V。

5. 已知某动态电路的网络函数，该电路的冲激响应为

() 。

二、简算题：（每小题7分，共56分）

1. 某网络的基本割集矩阵为,若已知连支电流

A，求树支电流i1、i2和i3。

2. 图2-1所示电路，在开关断开时，电流I=1A，求开关闭合后该支路的电流。

3. 图2-2所示电路中，已知，求电流表的读数（有效值）和电路消耗的平均功率。

4. 图2-3所示对称三相电路中，已知，求三相负载吸收的平均功率和负载一相的等效阻抗Z。

5. 图2-4所示电路中，已知阻抗Z1端电压的有效值为U1=200V，Z1吸收的平均功率P=800W，功率因数cosφ=0.8(容性），求输入端电压相量和电流相量。

6. 对于图2-5所示电路，若以i L和u C为状态变量，写出电路的状态方程。

7. 图2-6所示电路中，已知，若改变电阻R时，该支路电流

i保持不变，求电容C之值。

8. 如图2-7所示电路发生谐振，求谐振角频率ω。

三、图3所示正弦电流电路中，已知电容C=4μF，工作频率为ω=1000 rad/s，

，求在相位上越前于的相角。(14分)

四、图4电路在换路前已达稳态，t=0时开关由a换接到b，用拉普拉斯变换法求换路后电容电压的象函数U C(s)。（9分）

五、图5所示电路中，已知二端口电阻网络N的开路阻抗参数，电路在开关闭合前已处于稳态，t=0时闭合开关。用三要素法求t>0时的电阻电压u(t)。（15分）

考研模拟试题（三）

一．填空题(每空5分 , 共40分)

1. 已知 R-L串联的一阶电路的响应 , 电感L=100mH ,则电路的时间常数τ=_______s，电路的电阻R______Ω。

2. 电路如图1-1所示，电压，

电流，则可知电压的有效值Ｕ＝_______Ｖ，网络Ｎ吸收的有功功率Ｐ＝__________Ｗ。

3. ＲＬＣ串联的正弦稳态电路如图1-2所示，则电路的谐振频率ω0

___________rad/s ，且品质因数Ｑ＝___________。

4. 电路如图 1-3 所示, 试求Ｕ=_____________Ｖ。

5. 电路如图 1-4 所示，ＲＬ可调，ＲＬ可能获得的最大功率Ｐ= ____________Ｗ。

二．解答题。（共110分）

1．已知电路如图1所示，试求电流Ｉ2（20分）

2. 电路如图2所示，设i L(0)=0, u C(0)=0,试求电路中的响应u C(t),t≥0。（20分）

3．电路如图 3 所示, 试求图中各独立电源发出的功率。(15分)

4．电路如图 4 所示, 电路原已达稳态，t=0时合上开关S，试求i S。(15分)

5．电路如图5（a）所示,L=0.5H , N为无源线性电阻网络，当U S(t)=ε(t)时，，今将电感换成Ｃ＝０.05Ｆ的电容，试求图8(b)中

Ｕ0(t)=?[ε(t)为单位阶跃函数 ] (20分)

考研英语段落排序题全真模拟练习一00340

考研英语段落排序题全真模拟练习一 Directions: The following paragraphs are given in a wrong order. For Questions 41-45, you are required to reorganize these paragraphs into a coherent article by choosing from the list A-E to fill in each numbered box. The first and the last paragraphs have been placed for you in Boxes. Mark your answers on ANSWER SHEET 1. [A] On the first Monday after the second Wednesday in December, the electors who have been chosen in November assemble in their respective state capitals to signal their preference. The future president and vice-president must receive at least 270 electoral votes, a majority of the total of 538, to win. Members of the electoral college have the moral, but not the legal, obligation to vote for the candidate who won the popular vote in their state. This moral imperative, plus the fact that electors are members of the same political party as the presidential candidate winning the popular vote, ensures that the outcome in the electoral college is a valid reflection of the popular vote in November. [B] It is even possible for someone to win the popular vote, yet lost the presidency to another candidate. How? It has to do with the electoral college. [C] The electoral college was created in response to a problem encountered during the Constitutional Convention of 1787, where delegates were trying to determine the best way to choose the president. The framers of the Constitution intended that the electors, a body of men chosen for their wisdom, should come together and choose on behalf of the people. In fact, the swift rise of political parties guaranteed that the electoral of the people. In fact, the swift rise of political guaranteed that the electoral system never worked as the framers had intended; instead, national parties, i. e. nationwide alliances of local interests, quickly came to dominate the election campaigns. The electors became mere figureheads representing the state branches of the parties who got them chosen, and their votes were predetermined and predictable. [D] How are the electors chosen? Although there is some variation among states in how electors are appointed, generally they are chosen by the popular vote, always on the first Tuesday after the first Monday in November. Each political party in a state chooses a state of local worthies to be members of the electoral college if the party’s presidential candidate wins at least a plurality of the popular vote in the state. [E] How is the number of electors decided? Every state has one elector for each senator and representative it sends to Congress. States with greater populations therefore have more electors in the electoral college. All states have at least 3 electors, but California, the most populous state, has 54. The District of Columbia, though not a state, is also allowed to send three electors.

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考研英语二模拟试题及答案解析（7） (1~20/共20题)Section ⅠUse of English Directions: Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. Do people get happier or more foul-tempered as they age? Stereotypes of irritable neighbors__1__, scientists have been trying to answer this question for decades, and the results have been__2__Now a study of several thousand Americans born between 1885 and 1980 reveals that well-being__3__increases with age—but overall happiness__4__when a person was born. __5__studies that have__6__older adults with the middle-aged and young have sometimes found that older adults are not as happy. But these studies could not__7__whether their__8__was because of their age or because of their__9__life experience. The new study, published online January 24 in Psychological Science ,__10__out the answer by examining 30 years of data on thousands of Americans, including__11__measures of mood and well-being, reports of job and relationship success, and objective measures of health. The researchers found, after controlling for variables__12__health, wealth, gender, ethnicity and education, that well-being increases over everyone′s lifetime.__13__people who have lived through extreme hardship, such as the Great Depression,__14__much less happy than those who have had more__15__lives. This finding helps to__16__why past studies have found conflicting results—experience__17__, and tough times can__18__an entire generation′s happiness for the rest of their lives. The__19__news is,__20__we′ve lived through, we can all look forward to feeling more content as we age. 第1题 A.alike B.alongside C.aside D.besides 第2题 A.conflicting B.worrying C.revealing D.appealing 第3题 A.accordingly B.indeed C.hence D.nevertheless 第4题 A.resides with B.rests with C.depends on D.reckons on 第5题

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