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江苏省2014年高二对口期末模拟试卷

江苏省2014年高二对口期末模拟试卷
江苏省2014年高二对口期末模拟试卷

1 电工基础试卷

一、单项选择题(每小题4分,共24分)

1、两个电容器:C1电容30微法,额定电压45伏;C2电容50微法,额定电压45伏。将它

们串联后接80v 电压上,则 ( )

A 、两个电容器都能正常工作

B 、 两个电容器都被击穿

C 、C1被击穿 C2正常工作

D 、 C1正常工作 C2被击穿

2.电路如题2图所示,线圈的电阻忽略不计。当u ab <0时,开关S 的状态应为 ( )

A .S 闭合的瞬间

B .S 断开的瞬间

C .S 处于接通后的稳态

D .S 的状态不能确定

题2图

题3图

u

3.题3图所示正弦交流电路中,已知电源的角频率为ω=4rad/s 。若电流超前电压的角度为

arctan2

C

( ) A . 0.05 F B . 0.08F C .1.25 F D .5 F

4.实际电感线圈和电容器并联电路,发生谐振时,其特点是 ( )

A .总阻抗Z 0=L /RC 最大,总电流I 0=U/Z 0最小,电路呈电阻性,支路电流是总电流的Q 倍

B .总阻抗Z 0=R 最小,总电流I 0=U/R 最大,电路呈电阻性,总电流是支路电流的Q 倍

C .总阻抗Z 0=R +j (X L —X C ),总电流I 0=U /()

2

2C L X X R -+

D .总阻抗Z 0=RC / L 最小,总电流I 0=U/Z 0最大,总电流是支路电流的Q 倍

5.正方形线圈框共100匝,边长为10cm ,在磁感应强度为0.1T 的均匀磁场中以10转每秒的转速绕中心轴匀速转动,则从垂直于磁场位置转过90°瞬间,线圈感生电压的瞬时值为 A.3.14V B.

6.28V C.10V D.20V ( )

6.如题6图所示正弦交流电路中,当开关S 打开时,电路处于谐振状态,则当开关S 闭合时电路的性质为: ( ) A .阻性; B .感性; C .容性; D .纯电感。

题6图

2 24.利用直流电源来判别两互感线圈同名端的电路如题24图所示。若在开关S 断开的瞬间,电压表所测电压的极性为上正下负,则可判定①和②是同名端。( )

25.并联谐振电路电源频率增大时,电路的性质变为感性。( ) 26.电阻元件上电压、电流的初相一定都是零,所以它们是同相的。( )

27.RC 移相电路中,若输出电压取之于电阻,则输出电压的相位超前于输入电压的相位( ) 28不管外电路是否闭合,只要穿过电路的磁通发生变化,电路中就有感应电动势和感应电流.( )

题40图

题24图

三、 填空题(每空2分,共20分)

40.如题40图所示,匀强磁场中的金属导体MN 沿导轨向右匀速运动,则直流电流表的指针偏转情况为 (选填:正偏 / 反偏 / 不偏转);导体MN 所受电磁力的方向为 。

41两个靠得很近的线圈,甲线圈中的电流变化率为200A/S 时,在乙线圈中产生0.2V 的互感电动势,则M 为 若甲线圈中的电流为3A ,则由甲线圈产生与乙线圈铰链的磁链为 。

42.在RLC 串联电路中,已知电感为0.1mH ,电容为100PF,电阻为10Ω,电源电压为0.1mV ,若电路发生谐振,求谐振频率为 ,谐振电流为 ,电容上的电压为 ,品质因素为 。

43在RLC 并联电路中,总电压为80V ,总电流为2.82A,X C 为20Ω,I R 为2A ,且电路呈容性,则电阻R= ,感抗X L =

3

56、(4分)在题56图所示RLC 并联谐振电路中,已知I S =1mA ,问:

(1)电路的谐振角频率ω0是多少弧度/秒? (2)谐振时的容抗X C 是多少欧姆?

(3)谐振时,电阻R 两端的电压U R 是多少伏特? (4)谐振时,电感L 中的电流I L 是多少毫安?

题56图

μF

C

57.(4分)在下图的空心线圈A 内,突然插入一块磁铁。试分析: (1) 标出B 、D 线圈中感生电动势的极性;(2分) (2) 标出载流导线I 的受力方向;(1分) (3) 标出环F 的摆动方向。(1分)

五、计算题(本大题共3小题,共43分)

1、如图所示,设匀强磁场的磁感应强度B 为0.1T ,切割磁感线的导线长度L 为40cm ,向

右匀速运动的速度为5m/s ,整个线框的电阻R 为0.5欧,求(1)感应电动势的大小(2)感应电流的大小和方向(3)使导线向右匀速运动所需的

外力。(4)外力做功功率(5)感应电流的功率(10分)

4 2 RC 并联电路中,已知R=50欧,C=63.6微法,通过R 的电流瞬时解析式为i R =42sin

(314t-30°)A 。求i C 、i (15分)

3...如图1-2,u=2202sin314tV ,R=8Ω, X L =6Ω, X C =22Ω,则各仪表读数分别为?并画出各电流的相量图。(18分)

图1-2

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