电电工电子技术复题
选择题
I
1图1示电路中电流I（ B ）
•
3A
+
30V
A 3V
6Ω
B 5A
图1
•
C 2A
2图2示电路中U（ A ）
2A
45V
+
A 30V
U
15Ω
B 10V
图2
C 40V
3图3示电路中判断电阻R中流通电流消耗功率（ A ）
•
+
2V
A 1A2W
R
1A
2Ω
B 2A4W
图3
•
C 2A2W
2Ω
4图4示电路中判断电阻R中流通电流消耗功率（ B ）
R
+
2V
A 0A2W
1A
B 1A2W
图4
C 1A4W
5已知电路某元件电压u电流i分u10cos（ωt+200）V
i5sin（ωt+1100）A该元件性质（ C ）
A 电容 B 电感 C 电阻
6RLC串联电路中果调电容（ A ）
A电路感性增强 B 电路容性增强 C 电路性质变
º
7联电路相量图图示阻抗Z1Z2整电路性质分应（ C）
i2
i
i1
i1
i
Z2
1
•
Z1
º
A感性容性感性 B容性容性容性
C容性感性容性
8三相电路中三相称负载星形连接三线电流均4A中线电流（ C ）
A4A B12A C 0A
u
u i
9图示某电路中某支路电压u电流i波形判断该支路（ A ）
ωt
i
A 电阻电感串联电路
0
B 电阻电容串联电路
C 纯电感电路
10（ B ）利电磁感应原理进行变换交流电压种器件
A电动机 B 变压器 C 整流器
11图示变压器原方N1300匝副方N2100匝R8Ω原方入电阻Ri（ B ）
N2
N1
A 8Ω B72Ω C 24Ω
º
Ri
º
R
12图示变压器已知原方N1300匝 R8Ω原方入电阻Ri72Ω变压器副方绕组N2（ C ）
A200匝 B300匝 C 100匝
N2
N1
º
Ri
º
R
13三极处放状态时集电结处（ B ）
A正偏 B反偏 C偏压
14三极放电路中直流通路确定电路（ B ）
A放倍数 B 静态工作点 C 波形失真
15稳压二极利工作（ C）时电压变化极特性两端电压稳定
A 正 B反 C 反击穿
16基射放电路出现饱失真时三极输出特性交流负载线静态工作点般（ B ）
A偏低 B偏高 C 居中
17三极构成放器测子三极电压
脚
1
2
3
电 压U
6
23
2
脚2（ C ）
A集电极 B 发射极 C 基极
18稳压稳压电路相串联型稳压电路输出电压（ C ）
A 稳定 B较高 C 调
19放电路具稳定输出电流作提高输入电阻应采列（ A ）种反馈方式
A 电流串联负反馈 B电压联负反馈 C 电流联负反馈
20射极输出器电压放倍数（ C ）
A 1 B >1 C≤1
21 描述逻辑功方法：
（ A ）
1
A 真值表逻辑图表达式三种方法中种
B 真值表逻辑图两种方法中种
C 逻辑图表达式两种方法中种
22数字电路部电路三极电路器件般处（ C ）工作状态数字开关状态输入输出高低两种电位
D 截止放 B 导通放 C 截止导通
23二进制表达式：(1101011)21´24+1´23+0´22+1´21+0´20+1´21+
1´22中24项称（ B ）
A 基数 B 权 C 系数
24 TTL门电路（ B ）
2
A 输出高电位时带负载力强B输出低电位时带负载力强
C输出高电位低电位时带负载力相
25 D触发器功：（ C）
3
A 具置位复位保持翻转四种功 B具置位复位保持三种功
C具置位复位两种功
26 555定时器电路应中输出高电位时：7脚处（ A ）工作状态
4
A 开路 B短路 C开路短路
27基射放电路出现截止失真时三极输出特性交流负载线静态工作点般（ A ）
A偏低 B偏高 C 居中
28放电路引入电压联负反馈输入电阻（ B ）
A增 B减 C变
29．图中电流I（ A ）
A1A B1A C2A
30 已知电路某元件电压u电流i分u 141cos (314t +60)Vi 7sin
(314t120)A该元件性质( A )
A电容 B电感 C电阻
31 图示电路中电位器RP1滑动端移动RP2滑动端右移动时电流I1I2变化趋势( B )
A I1减12增 B I1增I2减 C I1变I2减
32 图示电路中电流表正负接线端+号标出电流表指针正偏转数10A关电流电压方表示图中( C )正确
AI110AU6V BI110AU6V CI110AU12V
33 放电路引电压串联负反馈输电阻(A)
A增 B减 C变
34般直流稳压电源包含变压器整流电路(B)电路稳压电路
A放 B滤波 C调整
35．图示电路中电流I（ B ）
A5V B15V C5V
36 放电路具稳定输出电压作提高输入电阻应采列（ C ）种反馈方式
A 电流串联负反馈 B电压联负反馈 C 电压串联负反馈
37．交流信号源阻1000Ω通变压调变压器接10Ω负载RL
负载获功率变压器变压（ B ）
A100 B10 C20
38已知电感性电路功率数06两端联电容功率数提高09总电流（ C ）
A变 B增 C减
39．图示电路中电源电压变频率升高灯泡亮度变化( B )
A灯泡变亮 B灯泡B变亮 C灯泡C变亮
40 RLC串联电路中果调电容(A )
A电路感性增强 B电路容性增强 C电路性质变
41三极放电路中 微变等效电路确定放电路(A )
A 放倍数 B静态工作点 C 波形失真
42 TTL 门电路 ( B)
A 输出高电位时带负载力强B 输出低电位时带负载力强
c 输出高电位低电位时带负载力相
43图示电路中电流I等( C)
A 2A B 0A C 2A
44 计算图 a b 示电路中元件A B 功率 判断(A ) 组答案正确
A A 吸收功率B 提供功率 B A 提供功率B 吸收功率 C A 吸收功率B 吸收功率
45 电容元件电压相量表示形式Ue ( B)
46 JK 触发器具( C)功
A 置位复位保持 B 置位复位翻转 c置位复位保持翻转
47 判断图示( a )( b ) (c)电路中等效电路(A )
A (a) ( b ) B (b) (c) c (a) ( c)
简答题
1作线性电路分析中重定理简述叠加定理基容适范围？
答：包含电源线性电路电路某元件电流电压等电源单独作该元件产生电流电压代数叠加定理分析计算线性电路中电流电计算功率
2三相异步电动机调速方式种？
答：直接起动控制〔点动长动)正反转控侧时间控制行程控制
3三相鼠笼式异步电动机相较绕线式异步电动机优点什？
答：绕线式异步电动机优点转子回路中接附加电阻改善电动机起动性起动转矩增起动电流减者调节异步电动机转速
4表示三相异步电动机起动力？三相异步电动机正常工作时电源电压允许波动范围少？
答：般异步电动机起动转矩额定转矩值TQDT N表示电动机起动力通常情况异步电动机起动力取值TQDTN1122间 三相异步电动机正常工作时电源电压允许波动范围应该正常电压士50
5什三极放电路饱失真截止失真？避免？
答输交流信号较静态工作点设置高信号正半周器件进饱区造成波形失真称饱失真反静态工作点设置低信号负半周器件进截止区造成波形失真称截止失真两种失真器件非线性特性造成统称非线性失真避免出现饱失真截止失真调节电阻Rg Rc电源ucx静态工作点负载线移动改变负载线斜率静态工作点移合适位置
6分析计算运放电路时常三项理想化指标什？
答(1)开环差模电压放倍数AOD穷差模输入电阻RID穷(3)差模输出电阻尺ROD零
7引入负反馈放电路性改善益处？
答起稳定静态工作点提高放倍数稳定性改变输输出电阻减失真拓展通频带等
8 组合逻辑电路逻辑功电路结构特点什？
答：组合逻辑电路特点逻辑功输出时输逻辑值关该时刻前输入电路状态均关称没记忆功电路结构构成组合逻辑电路门电路间没反馈环路
9 型JK触发器CP升作动作特点？
答：型触发器称电位触发型方式动作特点时钟CP升前刻瞬间JK接收输信号求CP1期间输入状态保持稳定时钟降产生输出
10．射极输出器特点？
答：输出电压输电压基相(似l略干1)相位相输电阻输出电阻
11．什正偏置反偏置二极正偏置反偏置时分什状态？
答：PN结P区接电源正极N区接电原负极时称外加正电压正偏置P区接电源负极N区接电源正极时称外加反电压反偏正偏置时二极处导通状态反偏置时二极处截止状态
12．简述RLC串联电路产生串联谐振特点？
答：（1）电路阻抗呈电阻性
(2)电路中电流
(3)XLXC串联谐振电容电感两瑞产生高电压
13电压源模型电流源模型等效变换条件什
答：果电压源模型输出电压输出电流电流源模型输出电压输出电流应相等说外部电路言二者伏安特性相两种模型等效互换
14三相交流电路中负载星形连接时相电流线电流相电压线电压关系
答： 相电流IL线电流IP 相电压线电压关系ULUP
15果需电动机连续运行三相异步电动机功率选择注意什
答：功率选择应该产生机械需实际功率选择效率功率数会低济选择电动机长时间工作外额定载状态仅保证正常工作造成电动机损坏
16组合逻辑电路分析步骤什
答：逻辑图中门输出端加标注写出门输出逻辑函数表达式门输出逻辑函数表达式进行迭代进行必化简写出真值表说明该电路途
16 熔断器注意事项
答：熔断器注意事项：(1) 劣质品牌保险丝 铜丝铁丝代保险丝(2) 更换熔丝熔时 必须断开电源(3) 熔断器插片定保持接触良发现插口处热触点变色 说明插口处接触良应时修复(4) 安装熔丝时 螺丝拧太紧 免熔丝扎伤熔丝应时针方弯 样拧紧螺钉时会较牢固熔丝需弯圈必弯(5) 果连接处螺钉出现滑丝 应立刻换新螺钉
17 接触器选择注意事项
答：(1) 额定电压选择 接触器额定电压等负载回路电压
(2) 额定电流选择 接触器额定电流应等控回路额定电流c
(3) 吸引线圈额定电压选择 吸引线圈额定电压应接控制电路电压致(4) 接触器触点数量种类选择 触点数量种类应满足电路控制电路求
18 恒流源性质什
答：恒流源性质(1 ) 输出电流始终恒定 受输出电压影响(2)恒流源端电压身决定相连负载电阻决定
19 简述提高功率数意义
答：电源够传送少功功率负载 功率数co s ψ 直接关系cos ψ 1 说明输出功率全部功功率电源设备充分利co s ψ 说明电源设备容量利程度低功率数造成电源设备浪费
二 综合题
1图示电路中已知电压表读数15V电流表读数1AR5Ω电源角频率ω200rads求电感L电路消耗功率
º
•
UR
R
º
•
图 11 11111
LR
解：设电流参考相量
电阻R电压相量
电感电压超前电流相位900
电路消耗功率
PI2R1×55W
2台三相异步电动机额定功率10KW额定电压380V额定转速980rmin额定工作效率η95额定工作电流IN18A起动力系数15载系数22求：1）电动机功率数2）起动转矩Tqd转矩Tmax
解：电动机额定输功率
定子三相绕组
电动机功率数
额定转矩
启动转矩
转矩
3台三相异步电动机磁极数p2工作额定电压380V额定频率50Hz已知额定转速1450rmin求步转速额定转差率？
4台三相异步电动机额定功率10KW额定电压380V额定转速980rmin额定工作效率η95额定工作电流IN18A起动力系数15载系数22
求：1）电动机功率数
2）起动转矩Tqd转矩Tmax
5基射放电路图示已知：UCC＝67VRb300kWRc2kW三极β100rbb 300WUBE07VC1C2容量足够试求：
（1）静态工作点IBQ＝？ICQ＝？UCEQ＝？
（2）电压放倍数Au
IBQ＝(UCC－UBE) Rb(6707)300k20μA
ICQ＝βIBQ＝2mA
UCEQ＝UCC－ICQ Rc672 mA×2k27v
6判断图（a）（b）示电路否失真放交流信号说明原
(a) (b)
(a)IBQ＝0 (b)放倍数等1
7说明图示电路种运算电路已知：R112kWRF18kW输入电压uI05V时试求输出电压值uO
解：该电路反例运算电路UO075V
8图组合逻辑电路进行分析写出逻辑函数FIF2F3表达式指出逻辑功
解：
实现两位二进制数较
9．图示运放具理想特性设两输入电压波形图示画出电压UO波形
答：图示电路标准减法器
10．图示两级运放电路已知R1 Rf110kR2R3 Rf220kui11Vui0 5V计算电路输出电压uo说明该电路够实现种功
解：UO05V 该电路减法运算电路
11 三位二进制数码高位低位分送电路三输入端 求三位数码中奇数1时电路输出1否0 试画出逻辑图
请您删容O(∩_∩)O谢谢2015年中央电期末复考试抄全电期末考试必备抄电考试必抄After earning his spurs in the kitchens of The Westin The Sheraton Sens on the Bund and a sprinkling of other topnotch venues Simpson Lu fi nally got the chance to become his own boss in November 2010 Sort of The Shanghaiborn chef might not actually own California Pizza Kitchen (CPK) but he is in sole charge of both kitchen and frontof house at this Sinan Mansions＇stalwart It’s certainly a responsibility to be the head chef and then to have to manage the rest of the restaurant as well the 31yearold tells Enjoy Shanghai In hotels for example these jobs are strictly demarcated so it’s a great opportunity to learn how a business operates across the board It was a task that management back in sunny California evidently felt he was ready for and a vote of confi dence from a company that to date has opened 250 outlets in 11 countries And for added pressure the Shanghai branch was also CPK’s China debut For sure it was a big step and unlike all their other Asia operations that are franchises they decided to manage it directly to begin with says Simpson Two years ago a private franchisee took over the lease but the links to CPK headquarters are still strong with a mainlandbased ＇brand ambassador’ on hand to ensure the business adheres to its ethos of creating innovative hearthbaked pizzas a slice of PR blurb that Simpson insists lives up to the hype They are very innovative he says The problem with most fast food places is that they use the same sauce on every pizza and just change the toppings Every one of our 16 pizza sauces is a unique recipe that has been formulated to complement the toppings perfectly The largely local customer base evidently agrees and on Saturday and Sunday at least the place is teeming The kidseatforfree policy at weekends is undoubtedly a big draw as well as is the spacious secondfl oor layout overlooked by a canopy of green from Fuxing Park over the road The company is also focusing on increasing brand recognition and in recent years has taken part in outside events such as the regular California Week Still the sta are honest enough to admit that business could be better as good in fact as in CPK’s second outlet in the popular Kerry Parkside shopping mall in Pudong Sinan Mansions has really struggled to get the number of visitors that were envisaged when it first opened and it hasn’t been easy for any of the tenants here adds Simpson We’re planning a third outlet in the city in 2015 and we will probably choose a shopping mall again because of the better foot traffic The tearooms once frequented by Coco Chanel and Marcel Proust are upping sticks and coming to Shanghai Xu Junqian visits the Parisian outpost with sweet treats One thing the centuryold Parisian tearoom Angelina has shown is that legendary fashion designer Coco Chanel not only had style and glamor but also boasted great taste in food pastries in particular One of the most popular tearooms in Paris Angelina is famous for having once been frequented by celebrities such as Chanel and writer Marcel Proust Now Angelina has packed up its French ambience efficient service and beautiful comforting desserts and flown them to Shanghai At the flagship dinein and takeout space in Shanghai everything mimics the original tearoom designed from the beginning of the 20th century in Paris the height of Belle Epoque The paintings on the wall for example are exactly the same as the one that depicts the landscape of southern France the hometown of the owner and the small tables are intentional imitations of the ones that Coco Chanel once sat at every afternoon for hot chocolate The famous hot chocolate known as L’Africain is a luxurious mixture of four types of cocoa beans imported from Africa blended in Paris and then shipped to Shanghai It’s sinfully sweet rich and thick as if putting a bar of melting chocolate directly on the tongue and the fresh whipped cream on the side makes a light but equally gratifying contrast It is also sold in glass bottles as takeaway The signature MontBlanc chestnut cake consists of three parts the pureed chestnut on top the vanilla cream like stuffing and the meringue as base Get all three layers in one scoop not only for the different textures but also various flavors of sweetness The dessert has maintained its popularity for a century even in a country like France perhaps the world’s most competitive place for desserts A much overlooked pairing is the ParisNew York choux pastry and N226 chocolate flavored tea The choux pastry is a mouthful of airy pecanflavored whipped cream while the tea a blend of black teas from China and Ceylon cocoa and rose petals offers a more subtle fragrance of flowers and chocolate Ordering these two items featuring a muted sweetness makes it easier for you to fit into your little black dress Breakfast brunch lunch and light supper are also served at the tearoom a hub of many cultures and takes in a mix of different styles of French cuisines according to the management team The semicooked foie gras terrine is seductive and deceptive It’s generously served at the size and shape of a toast while the actual brioche toast is baked into a curved slice dipped with fig chutney The flavor however is honest strong smooth and sublime And you don’t actually need the toast for crunchiness This is the season for high teas with dainty cups of fine china and little pastries that appeal to both visual and physical appetites But there is one high tea with a difference and Pauline D Loh finds out just exactly why it is special Earl Grey tea and macarons are all very well for the crucial recuperative break inbetween intensive bouts of holiday season shopping And for those who prefer savory to sweet there is still the selection of classic Chinese snacks called dim sum to satisfy and satiate High tea is a meal to eat with eye and mouth an inbetween indulgence that should be light enough not to spoil dinner but sufficiently robust to take the edge off the hunger that strikes hours after lunch The afternoon tea special at ShangXi at the Four Seasons Hotel Pudong has just the right elements It is a pampering meal with touches of luxury that make the high tea session a treat in itself Whole baby abalones are braised and then topped on a shortcrust pastry shell a sort of Chinese version of the Western volauvent but classier Even classier is the dim sum staple shrimp dumpling or hargow upgraded with the addition of slivers of midnight dark truffles This is a master touch and chef Simon Choi who presides unchallenged at ShangXi has scored a winner again Sweet prawns and aromatic truffles — what’s not to love His masterful craftsmanship is exhibited in yet another pastry — a sweet pastry that is shaped to look like a walnut but which you can put straight into the mouth It crumbles immediately and the slightly sweet nutty morsel is so easy to eat you’ll probably reach straight for another My favorite is the dessert that goes by the name yangzhi ganlu or ambrosia from the gods The hotel calls it chilled mango cream with sago pomelo and bird’s nest – made with ingredients that resonate with every female soul It does taste like ambrosia with the sweetsour fragrance of the mango forming the first layer of taste and sensation and the pomelo sacs and sago pearls providing the tactile contrast The bird’s nest — it’s the ingredient that gilds the lily since it is supposed to nourish and nurture a perfect complexion For those unfamiliar with this exotic ingredient the bird’s nest is not a bundle of twigs but is instead the dried secretion that cave swifts use to build their nest Technically it’s bird saliva but the Chinese believe that it has collagenboosting properties essential to beauty To me it just tastes good adding a slight gelatinous crunch to the back of the teeth There is also a baked mushroom puff pastry that includes the highly prized Matsutake or pine mushroom You also get a choice of teas but I strongly recommend the aged Pu’er from Yunnan province It is a mellow tea that will go perfectly with the rich little nuggets and will warm you up on a cold afternoon Incidentally the general guide is green tea such as Longjing or Dragonwell for the hot season semifermented teas like Wulong or Iron Buddha for autumn and more warming teas like Pu’er for winter The ShangXi afternoon tea costs 228 yuan (37) per person and 388 yuan for the more opule
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选择题
I
1图1示电路中电流I（ B ）
•
3A
+
30V
A 3V
6Ω
B 5A
图1
•
C 2A
2图2示电路中U（ A ）
2A
45V
+
A 30V
U
15Ω
B 10V
图2
C 40V
3图3示电路中判断电阻R中流通电流消耗功率（ A ）
•
+
2V
A 1A2W
R
1A
2Ω
B 2A4W
图3
•
C 2A2W
2Ω
4图4示电路中判断电阻R中流通电流消耗功率（ B ）
R
+
2V
A 0A2W
1A
B 1A2W
图4
C 1A4W
5已知电路某元件电压u电流i分u10cos（ωt+200）V
i5sin（ωt+1100）A该元件性质（ C ）
A 电容 B 电感 C 电阻
6RLC串联电路中果调电容（ A ）
A电路感性增强 B 电路容性增强 C 电路性质变
º
7联电路相量图图示阻抗Z1Z2整电路性质分应（ C）
i2
i
i1
i1
i
Z2
1
•
Z1
º
A感性容性感性 B容性容性容性
C容性感性容性
8三相电路中三相称负载星形连接三线电流均4A中线电流（ C ）
A4A B12A C 0A
u
u i
9图示某电路中某支路电压u电流i波形判断该支路（ A ）
ωt
i
A 电阻电感串联电路
0
B 电阻电容串联电路
C 纯电感电路
10（ B ）利电磁感应原理进行变换交流电压种器件
A电动机 B 变压器 C 整流器
11图示变压器原方N1300匝副方N2100匝R8Ω原方入电阻Ri（ B ）
N2
N1
A 8Ω B72Ω C 24Ω
º
Ri
º
R
12图示变压器已知原方N1300匝 R8Ω原方入电阻Ri72Ω变压器副方绕组N2（ C ）
A200匝 B300匝 C 100匝
N2
N1
º
Ri
º
R
13三极处放状态时集电结处（ B ）
A正偏 B反偏 C偏压
14三极放电路中直流通路确定电路（ B ）
A放倍数 B 静态工作点 C 波形失真
15稳压二极利工作（ C）时电压变化极特性两端电压稳定
A 正 B反 C 反击穿
16基射放电路出现饱失真时三极输出特性交流负载线静态工作点般（ B ）
A偏低 B偏高 C 居中
17三极构成放器测子三极电压
脚
1
2
3
电 压U
6
23
2
脚2（ C ）
A集电极 B 发射极 C 基极
18稳压稳压电路相串联型稳压电路输出电压（ C ）
A 稳定 B较高 C 调
19放电路具稳定输出电流作提高输入电阻应采列（ A ）种反馈方式
A 电流串联负反馈 B电压联负反馈 C 电流联负反馈
20射极输出器电压放倍数（ C ）
A 1 B >1 C≤1
21 描述逻辑功方法：
（ A ）
1
A 真值表逻辑图表达式三种方法中种
B 真值表逻辑图两种方法中种
C 逻辑图表达式两种方法中种
22数字电路部电路三极电路器件般处（ C ）工作状态数字开关状态输入输出高低两种电位
D 截止放 B 导通放 C 截止导通
23二进制表达式：(1101011)21´24+1´23+0´22+1´21+0´20+1´21+
1´22中24项称（ B ）
A 基数 B 权 C 系数
24 TTL门电路（ B ）
2
A 输出高电位时带负载力强B输出低电位时带负载力强
C输出高电位低电位时带负载力相
25 D触发器功：（ C）
3
A 具置位复位保持翻转四种功 B具置位复位保持三种功
C具置位复位两种功
26 555定时器电路应中输出高电位时：7脚处（ A ）工作状态
4
A 开路 B短路 C开路短路
27基射放电路出现截止失真时三极输出特性交流负载线静态工作点般（ A ）
A偏低 B偏高 C 居中
28放电路引入电压联负反馈输入电阻（ B ）
A增 B减 C变
29．图中电流I（ A ）
A1A B1A C2A
30 已知电路某元件电压u电流i分u 141cos (314t +60)Vi 7sin
(314t120)A该元件性质( A )
A电容 B电感 C电阻
31 图示电路中电位器RP1滑动端移动RP2滑动端右移动时电流I1I2变化趋势( B )
A I1减12增 B I1增I2减 C I1变I2减
32 图示电路中电流表正负接线端+号标出电流表指针正偏转数10A关电流电压方表示图中( C )正确
AI110AU6V BI110AU6V CI110AU12V
33 放电路引电压串联负反馈输电阻(A)
A增 B减 C变
34般直流稳压电源包含变压器整流电路(B)电路稳压电路
A放 B滤波 C调整
35．图示电路中电流I（ B ）
A5V B15V C5V
36 放电路具稳定输出电压作提高输入电阻应采列（ C ）种反馈方式
A 电流串联负反馈 B电压联负反馈 C 电压串联负反馈
37．交流信号源阻1000Ω通变压调变压器接10Ω负载RL
负载获功率变压器变压（ B ）
A100 B10 C20
38已知电感性电路功率数06两端联电容功率数提高09总电流（ C ）
A变 B增 C减
39．图示电路中电源电压变频率升高灯泡亮度变化( B )
A灯泡变亮 B灯泡B变亮 C灯泡C变亮
40 RLC串联电路中果调电容(A )
A电路感性增强 B电路容性增强 C电路性质变
41三极放电路中 微变等效电路确定放电路(A )
A 放倍数 B静态工作点 C 波形失真
42 TTL 门电路 ( B)
A 输出高电位时带负载力强B 输出低电位时带负载力强
c 输出高电位低电位时带负载力相
43图示电路中电流I等( C)
A 2A B 0A C 2A
44 计算图 a b 示电路中元件A B 功率 判断(A ) 组答案正确
A A 吸收功率B 提供功率 B A 提供功率B 吸收功率 C A 吸收功率B 吸收功率
45 电容元件电压相量表示形式Ue ( B)
46 JK 触发器具( C)功
A 置位复位保持 B 置位复位翻转 c置位复位保持翻转
47 判断图示( a )( b ) (c)电路中等效电路(A )
A (a) ( b ) B (b) (c) c (a) ( c)
简答题
1作线性电路分析中重定理简述叠加定理基容适范围？
答：包含电源线性电路电路某元件电流电压等电源单独作该元件产生电流电压代数叠加定理分析计算线性电路中电流电计算功率
2三相异步电动机调速方式种？
答：直接起动控制〔点动长动)正反转控侧时间控制行程控制
3三相鼠笼式异步电动机相较绕线式异步电动机优点什？
答：绕线式异步电动机优点转子回路中接附加电阻改善电动机起动性起动转矩增起动电流减者调节异步电动机转速
4表示三相异步电动机起动力？三相异步电动机正常工作时电源电压允许波动范围少？
答：般异步电动机起动转矩额定转矩值TQDT N表示电动机起动力通常情况异步电动机起动力取值TQDTN1122间 三相异步电动机正常工作时电源电压允许波动范围应该正常电压士50
5什三极放电路饱失真截止失真？避免？
答输交流信号较静态工作点设置高信号正半周器件进饱区造成波形失真称饱失真反静态工作点设置低信号负半周器件进截止区造成波形失真称截止失真两种失真器件非线性特性造成统称非线性失真避免出现饱失真截止失真调节电阻Rg Rc电源ucx静态工作点负载线移动改变负载线斜率静态工作点移合适位置
6分析计算运放电路时常三项理想化指标什？
答(1)开环差模电压放倍数AOD穷差模输入电阻RID穷(3)差模输出电阻尺ROD零
7引入负反馈放电路性改善益处？
答起稳定静态工作点提高放倍数稳定性改变输输出电阻减失真拓展通频带等
8 组合逻辑电路逻辑功电路结构特点什？
答：组合逻辑电路特点逻辑功输出时输逻辑值关该时刻前输入电路状态均关称没记忆功电路结构构成组合逻辑电路门电路间没反馈环路
9 型JK触发器CP升作动作特点？
答：型触发器称电位触发型方式动作特点时钟CP升前刻瞬间JK接收输信号求CP1期间输入状态保持稳定时钟降产生输出
10．射极输出器特点？
答：输出电压输电压基相(似l略干1)相位相输电阻输出电阻
11．什正偏置反偏置二极正偏置反偏置时分什状态？
答：PN结P区接电源正极N区接电原负极时称外加正电压正偏置P区接电源负极N区接电源正极时称外加反电压反偏正偏置时二极处导通状态反偏置时二极处截止状态
12．简述RLC串联电路产生串联谐振特点？
答：（1）电路阻抗呈电阻性
(2)电路中电流
(3)XLXC串联谐振电容电感两瑞产生高电压
13电压源模型电流源模型等效变换条件什
答：果电压源模型输出电压输出电流电流源模型输出电压输出电流应相等说外部电路言二者伏安特性相两种模型等效互换
14三相交流电路中负载星形连接时相电流线电流相电压线电压关系
答： 相电流IL线电流IP 相电压线电压关系ULUP
15果需电动机连续运行三相异步电动机功率选择注意什
答：功率选择应该产生机械需实际功率选择效率功率数会低济选择电动机长时间工作外额定载状态仅保证正常工作造成电动机损坏
16组合逻辑电路分析步骤什
答：逻辑图中门输出端加标注写出门输出逻辑函数表达式门输出逻辑函数表达式进行迭代进行必化简写出真值表说明该电路途
16 熔断器注意事项
答：熔断器注意事项：(1) 劣质品牌保险丝 铜丝铁丝代保险丝(2) 更换熔丝熔时 必须断开电源(3) 熔断器插片定保持接触良发现插口处热触点变色 说明插口处接触良应时修复(4) 安装熔丝时 螺丝拧太紧 免熔丝扎伤熔丝应时针方弯 样拧紧螺钉时会较牢固熔丝需弯圈必弯(5) 果连接处螺钉出现滑丝 应立刻换新螺钉
17 接触器选择注意事项
答：(1) 额定电压选择 接触器额定电压等负载回路电压
(2) 额定电流选择 接触器额定电流应等控回路额定电流c
(3) 吸引线圈额定电压选择 吸引线圈额定电压应接控制电路电压致(4) 接触器触点数量种类选择 触点数量种类应满足电路控制电路求
18 恒流源性质什
答：恒流源性质(1 ) 输出电流始终恒定 受输出电压影响(2)恒流源端电压身决定相连负载电阻决定
19 简述提高功率数意义
答：电源够传送少功功率负载 功率数co s ψ 直接关系cos ψ 1 说明输出功率全部功功率电源设备充分利co s ψ 说明电源设备容量利程度低功率数造成电源设备浪费
二 综合题
1图示电路中已知电压表读数15V电流表读数1AR5Ω电源角频率ω200rads求电感L电路消耗功率
º
•
UR
R
º
•
图 11 11111
LR
解：设电流参考相量
电阻R电压相量
电感电压超前电流相位900
电路消耗功率
PI2R1×55W
2台三相异步电动机额定功率10KW额定电压380V额定转速980rmin额定工作效率η95额定工作电流IN18A起动力系数15载系数22求：1）电动机功率数2）起动转矩Tqd转矩Tmax
解：电动机额定输功率
定子三相绕组
电动机功率数
额定转矩
启动转矩
转矩
3台三相异步电动机磁极数p2工作额定电压380V额定频率50Hz已知额定转速1450rmin求步转速额定转差率？
4台三相异步电动机额定功率10KW额定电压380V额定转速980rmin额定工作效率η95额定工作电流IN18A起动力系数15载系数22
求：1）电动机功率数
2）起动转矩Tqd转矩Tmax
5基射放电路图示已知：UCC＝67VRb300kWRc2kW三极β100rbb 300WUBE07VC1C2容量足够试求：
（1）静态工作点IBQ＝？ICQ＝？UCEQ＝？
（2）电压放倍数Au
IBQ＝(UCC－UBE) Rb(6707)300k20μA
ICQ＝βIBQ＝2mA
UCEQ＝UCC－ICQ Rc672 mA×2k27v
6判断图（a）（b）示电路否失真放交流信号说明原
(a) (b)
(a)IBQ＝0 (b)放倍数等1
7说明图示电路种运算电路已知：R112kWRF18kW输入电压uI05V时试求输出电压值uO
解：该电路反例运算电路UO075V
8图组合逻辑电路进行分析写出逻辑函数FIF2F3表达式指出逻辑功
解：
实现两位二进制数较
9．图示运放具理想特性设两输入电压波形图示画出电压UO波形
答：图示电路标准减法器
10．图示两级运放电路已知R1 Rf110kR2R3 Rf220kui11Vui0 5V计算电路输出电压uo说明该电路够实现种功
解：UO05V 该电路减法运算电路
11 三位二进制数码高位低位分送电路三输入端 求三位数码中奇数1时电路输出1否0 试画出逻辑图
请您删容O(∩_∩)O谢谢2015年中央电期末复考试抄全电期末考试必备抄电考试必抄After earning his spurs in the kitchens of The Westin The Sheraton Sens on the Bund and a sprinkling of other topnotch venues Simpson Lu fi nally got the chance to become his own boss in November 2010 Sort of The Shanghaiborn chef might not actually own California Pizza Kitchen (CPK) but he is in sole charge of both kitchen and frontof house at this Sinan Mansions＇stalwart It’s certainly a responsibility to be the head chef and then to have to manage the rest of the restaurant as well the 31yearold tells Enjoy Shanghai In hotels for example these jobs are strictly demarcated so it’s a great opportunity to learn how a business operates across the board It was a task that management back in sunny California evidently felt he was ready for and a vote of confi dence from a company that to date has opened 250 outlets in 11 countries And for added pressure the Shanghai branch was also CPK’s China debut For sure it was a big step and unlike all their other Asia operations that are franchises they decided to manage it directly to begin with says Simpson Two years ago a private franchisee took over the lease but the links to CPK headquarters are still strong with a mainlandbased ＇brand ambassador’ on hand to ensure the business adheres to its ethos of creating innovative hearthbaked pizzas a slice of PR blurb that Simpson insists lives up to the hype They are very innovative he says The problem with most fast food places is that they use the same sauce on every pizza and just change the toppings Every one of our 16 pizza sauces is a unique recipe that has been formulated to complement the toppings perfectly The largely local customer base evidently agrees and on Saturday and Sunday at least the place is teeming The kidseatforfree policy at weekends is undoubtedly a big draw as well as is the spacious secondfl oor layout overlooked by a canopy of green from Fuxing Park over the road The company is also focusing on increasing brand recognition and in recent years has taken part in outside events such as the regular California Week Still the sta are honest enough to admit that business could be better as good in fact as in CPK’s second outlet in the popular Kerry Parkside shopping mall in Pudong Sinan Mansions has really struggled to get the number of visitors that were envisaged when it first opened and it hasn’t been easy for any of the tenants here adds Simpson We’re planning a third outlet in the city in 2015 and we will probably choose a shopping mall again because of the better foot traffic The tearooms once frequented by Coco Chanel and Marcel Proust are upping sticks and coming to Shanghai Xu Junqian visits the Parisian outpost with sweet treats One thing the centuryold Parisian tearoom Angelina has shown is that legendary fashion designer Coco Chanel not only had style and glamor but also boasted great taste in food pastries in particular One of the most popular tearooms in Paris Angelina is famous for having once been frequented by celebrities such as Chanel and writer Marcel Proust Now Angelina has packed up its French ambience efficient service and beautiful comforting desserts and flown them to Shanghai At the flagship dinein and takeout space in Shanghai everything mimics the original tearoom designed from the beginning of the 20th century in Paris the height of Belle Epoque The paintings on the wall for example are exactly the same as the one that depicts the landscape of southern France the hometown of the owner and the small tables are intentional imitations of the ones that Coco Chanel once sat at every afternoon for hot chocolate The famous hot chocolate known as L’Africain is a luxurious mixture of four types of cocoa beans imported from Africa blended in Paris and then shipped to Shanghai It’s sinfully sweet rich and thick as if putting a bar of melting chocolate directly on the tongue and the fresh whipped cream on the side makes a light but equally gratifying contrast It is also sold in glass bottles as takeaway The signature MontBlanc chestnut cake consists of three parts the pureed chestnut on top the vanilla cream like stuffing and the meringue as base Get all three layers in one scoop not only for the different textures but also various flavors of sweetness The dessert has maintained its popularity for a century even in a country like France perhaps the world’s most competitive place for desserts A much overlooked pairing is the ParisNew York choux pastry and N226 chocolate flavored tea The choux pastry is a mouthful of airy pecanflavored whipped cream while the tea a blend of black teas from China and Ceylon cocoa and rose petals offers a more subtle fragrance of flowers and chocolate Ordering these two items featuring a muted sweetness makes it easier for you to fit into your little black dress Breakfast brunch lunch and light supper are also served at the tearoom a hub of many cultures and takes in a mix of different styles of French cuisines according to the management team The semicooked foie gras terrine is seductive and deceptive It’s generously served at the size and shape of a toast while the actual brioche toast is baked into a curved slice dipped with fig chutney The flavor however is honest strong smooth and sublime And you don’t actually need the toast for crunchiness This is the season for high teas with dainty cups of fine china and little pastries that appeal to both visual and physical appetites But there is one high tea with a difference and Pauline D Loh finds out just exactly why it is special Earl Grey tea and macarons are all very well for the crucial recuperative break inbetween intensive bouts of holiday season shopping And for those who prefer savory to sweet there is still the selection of classic Chinese snacks called dim sum to satisfy and satiate High tea is a meal to eat with eye and mouth an inbetween indulgence that should be light enough not to spoil dinner but sufficiently robust to take the edge off the hunger that strikes hours after lunch The afternoon tea special at ShangXi at the Four Seasons Hotel Pudong has just the right elements It is a pampering meal with touches of luxury that make the high tea session a treat in itself Whole baby abalones are braised and then topped on a shortcrust pastry shell a sort of Chinese version of the Western volauvent but classier Even classier is the dim sum staple shrimp dumpling or hargow upgraded with the addition of slivers of midnight dark truffles This is a master touch and chef Simon Choi who presides unchallenged at ShangXi has scored a winner again Sweet prawns and aromatic truffles — what’s not to love His masterful craftsmanship is exhibited in yet another pastry — a sweet pastry that is shaped to look like a walnut but which you can put straight into the mouth It crumbles immediately and the slightly sweet nutty morsel is so easy to eat you’ll probably reach straight for another My favorite is the dessert that goes by the name yangzhi ganlu or ambrosia from the gods The hotel calls it chilled mango cream with sago pomelo and bird’s nest – made with ingredients that resonate with every female soul It does taste like ambrosia with the sweetsour fragrance of the mango forming the first layer of taste and sensation and the pomelo sacs and sago pearls providing the tactile contrast The bird’s nest — it’s the ingredient that gilds the lily since it is supposed to nourish and nurture a perfect complexion For those unfamiliar with this exotic ingredient the bird’s nest is not a bundle of twigs but is instead the dried secretion that cave swifts use to build their nest Technically it’s bird saliva but the Chinese believe that it has collagenboosting properties essential to beauty To me it just tastes good adding a slight gelatinous crunch to the back of the teeth There is also a baked mushroom puff pastry that includes the highly prized Matsutake or pine mushroom You also get a choice of teas but I strongly recommend the aged Pu’er from Yunnan province It is a mellow tea that will go perfectly with the rich little nuggets and will warm you up on a cold afternoon Incidentally the general guide is green tea such as Longjing or Dragonwell for the hot season semifermented teas like Wulong or Iron Buddha for autumn and more warming teas like Pu’er for winter The ShangXi afternoon tea costs 228 yuan (37) per person and 388 yuan for the more opule
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