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FCC E5C - 电学与电路原理

FCC 题库总览 > E级 (最高特级 Extra) > E5 电学与电路原理 > E5C

小节 E5C:电学与电路原理

本小节共包含 12 道中英双语精校考题
#E5C01🔗
Which of the following represents pure capacitive reactance of 100 ohms in rectangular notation?
以下哪项代表矩形符号中 100 欧姆的纯容抗?
A
0 - j100
0 - j100
✓ 正确答案
B
0 + j100
0+j100
C
100 - j0
100 - j0
D
100 + j0
100+j0
#E5C02🔗
How are impedances described in polar coordinates?
如何用极坐标描述阻抗?
A
By X and R values
通过 X 和 R 值
B
By real and imaginary parts
由实部和虚部组成
C
By magnitude and phase angle
按幅度和相位角
✓ 正确答案
D
By Y and G values
通过 Y 和 G 值
#E5C03🔗
Which of the following represents a pure inductive reactance in polar coordinates?
以下哪项代表极坐标中的纯感抗?
A
A positive 45 degree phase angle
正 45 度相位角
B
A negative 45 degree phase angle
负45度相位角
C
A positive 90 degree phase angle
正 90 度相位角
✓ 正确答案
D
A negative 90 degree phase angle
负 90 度相位角
#E5C04🔗
What type of Y-axis scale is most often used for graphs of circuit frequency response?
哪种类型的 Y 轴刻度最常用于电路频率响应图?
A
Linear
线性
B
Scatter
分散
C
Random
随机
D
Logarithmic
对数
✓ 正确答案
#E5C05🔗
What kind of diagram is used to show the phase relationship between impedances at a given frequency?
使用什么样的图来显示给定频率下阻抗之间的相位关系?
A
Venn diagram
维恩图
B
Near field diagram
近场图
C
Phasor diagram
相量图
✓ 正确答案
D
Far field diagram
远场图
#E5C06🔗
What does the impedance 50 - j25 ohms represent?
阻抗50-j25欧姆代表什么?
A
50 ohms resistance in series with 25 ohms inductive reactance
50欧姆电阻串联25欧姆感抗
B
50 ohms resistance in series with 25 ohms capacitive reactance
50欧姆电阻与25欧姆容抗串联
✓ 正确答案
C
25 ohms resistance in series with 50 ohms inductive reactance
25欧姆电阻串联50欧姆感抗
D
25 ohms resistance in series with 50 ohms capacitive reactance
25欧姆电阻串联50欧姆容抗
#E5C07🔗
Where is the impedance of a pure resistance plotted on rectangular coordinates?
纯电阻的阻抗绘制在直角坐标上的什么位置?
A
On the vertical axis
在垂直轴上
B
On a line through the origin, slanted at 45 degrees
在通过原点的直线上,倾斜 45 度
C
On a horizontal line, offset vertically above the horizontal axis
在水平线上,垂直于水平轴上方偏移
D
On the horizontal axis
在横轴上
✓ 正确答案
#E5C08🔗
What coordinate system is often used to display the phase angle of a circuit containing resistance, inductive, and/or capacitive reactance?
通常使用什么坐标系来显示包含电阻、感抗和/或容抗的电路的相位角?
A
Maidenhead grid
梅登黑德网格
B
Faraday grid
法拉第网格
C
Elliptical coordinates
椭圆坐标
D
Polar coordinates
极坐标
✓ 正确答案
#E5C09🔗
When using rectangular coordinates to graph the impedance of a circuit, what do the axes represent?
当使用直角坐标绘制电路阻抗图时,轴代表什么?
A
The X axis represents the resistive component, and the Y axis represents the reactive component
X轴代表电阻分量,Y轴代表电抗分量
✓ 正确答案
B
The X axis represents the reactive component, and the Y axis represents the resistive component
X轴代表电抗分量,Y轴代表电阻分量
C
The X axis represents the phase angle, and the Y axis represents the magnitude
X轴代表相位角,Y轴代表幅度
D
The X axis represents the magnitude, and the Y axis represents the phase angle
X轴代表幅度,Y轴代表相位角
#E5C10🔗
Which point on Figure E5-1 best represents the impedance of a series circuit consisting of a 400-ohm resistor and a 38-picofarad capacitor at 14 MHz?
图 E5-1 上的哪一点最能代表由 400 欧姆电阻器和 38 皮法电容器组成的串联电路在 14 MHz 时的阻抗?
Figure for E5C10
A
Point 2
第2点
B
Point 4
第4点
✓ 正确答案
C
Point 5
第5点
D
Point 6
第6点
#E5C11🔗
Which point in Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and an 18-microhenry inductor at 3.505 MHz?
图 E5-1 中的哪一点最能代表由 300 欧姆电阻器和 18 微亨电感器组成的串联电路在 3.505 MHz 时的阻抗?
Figure for E5C11
A
Point 1
第1点
B
Point 3
第3点
✓ 正确答案
C
Point 7
第7点
D
Point 8
第8点
#E5C12🔗
Which point on Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and a 19-picofarad capacitor at 21.200 MHz?
图 E5-1 上的哪一点最能代表由 300 欧姆电阻器和 19 皮法电容器组成的串联电路在 21.200 MHz 时的阻抗?
Figure for E5C12
A
Point 1
第1点
✓ 正确答案
B
Point 3
第3点
C
Point 7
第7点
D
Point 8
第8点
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