FCC G5A - 电路与电学原理

G级 (通用级 General)

G1 联邦通信委员会（FCC）规章制度

G1A 10题 G1B 11题 G1C 8题 G1D 12题 G1E 11题

G2 电台操作规范

G2A 12题 G2B 11题 G2C 11题 G2D 11题 G2E 15题

G3 无线电波传播

G3A 14题 G3B 12题 G3C 11题

G4 业余无线电实践与电台操作

G4A 13题 G4B 13题 G4C 12题 G4D 11题 G4E 11题

G5 电路与电学原理

G5A 12题 G5B 14题 G5C 14题

G6 电路元件

G6A 12题 G6B 11题

G7 实用的电路与原理图

G7A 13题 G7B 11题 G7C 14题

G8 信号与发射模式

G8A 14题 G8B 13题 G8C 15题

G9 天线与馈线系统

G9A 11题 G9B 12题 G9C 11题 G9D 12题

G0 电气与射频安全

G0A 12题 G0B 13题

FCC 题库总览 > G级 (通用级 General) > G5 电路与电学原理 > G5A

小节 G5A：电路与电学原理

本小节共包含 12 道中英双语精校考题

📖 背题解析模式 ✍️ 刷题自测模式

#G5A01🔗

What happens when inductive and capacitive reactance are equal in a series LC circuit?

当串联 LC 电路中感抗和容抗相等时会发生什么？

A

Resonance causes impedance to be very high

谐振导致阻抗非常高

B

Impedance is equal to the geometric mean of the inductance and capacitance

阻抗等于电感和电容的几何平均值

C

Resonance causes impedance to be very low

谐振导致阻抗非常低

✓ 正确答案

D

Impedance is equal to the arithmetic mean of the inductance and capacitance

阻抗等于电感和电容的算术平均值

#G5A02🔗

What is reactance?

什么是电抗？

A

Opposition to the flow of direct current caused by resistance

由于电阻而阻碍直流电的流动

B

Opposition to the flow of alternating current caused by capacitance or inductance

由电容或电感引起的对交流电流动的阻碍

✓ 正确答案

C

Reinforcement of the flow of direct current caused by resistance

由电阻引起的直流电流的流动增强

D

Reinforcement of the flow of alternating current caused by capacitance or inductance

由电容或电感引起的交流电流的增强

#G5A03🔗

Which of the following is opposition to the flow of alternating current in an inductor?

以下哪项与电感器中交流电流的流动相反？

A

Conductance

电导

B

Reluctance

不情愿

C

Admittance

入场费

D

Reactance

电抗

✓ 正确答案

#G5A04🔗

Which of the following is opposition to the flow of alternating current in a capacitor?

以下哪项与电容器中交流电的流动相反？

A

Conductance

电导

B

Reluctance

不情愿

C

Reactance

电抗

✓ 正确答案

D

Admittance

入场费

#G5A05🔗

How does an inductor react to AC?

电感器对交流电有何反应？

A

As the frequency of the applied AC increases, the reactance decreases

随着施加的交流电频率增加，电抗减小

B

As the amplitude of the applied AC increases, the reactance increases

随着施加的交流电幅度增加，电抗增加

C

As the amplitude of the applied AC increases, the reactance decreases

随着施加的交流电幅度增加，电抗减小

D

As the frequency of the applied AC increases, the reactance increases

随着施加的交流电频率增加，电抗增加

✓ 正确答案

#G5A06🔗

How does a capacitor react to AC?

电容器对交流电有何反应？

A

As the frequency of the applied AC increases, the reactance decreases

随着施加的交流电频率增加，电抗减小

✓ 正确答案

B

As the frequency of the applied AC increases, the reactance increases

随着施加的交流电频率增加，电抗增加

C

As the amplitude of the applied AC increases, the reactance increases

随着施加的交流电幅度增加，电抗增加

D

As the amplitude of the applied AC increases, the reactance decreases

随着施加的交流电幅度增加，电抗减小

#G5A07🔗

What is the term for the inverse of impedance?

阻抗倒数的术语是什么？

A

Conductance

电导

B

Susceptance

电纳

C

Reluctance

不情愿

D

Admittance

入场费

✓ 正确答案

#G5A08🔗

What is impedance?

什么是阻抗？

A

The ratio of current to voltage

电流与电压之比

B

The product of current and voltage

电流和电压的乘积

C

The ratio of voltage to current

电压与电流之比

✓ 正确答案

D

The product of current and reactance

电流和电抗的乘积

#G5A09🔗

What unit is used to measure reactance?

测量电抗使用什么单位？

A

Farad

法拉

B

Ohm

欧姆

✓ 正确答案

C

Ampere

安培

D

Siemens

西门子

#G5A10🔗

Which of the following devices can be used for impedance matching at radio frequencies?

以下哪些设备可用于射频阻抗匹配？

A

A transformer

变压器

B

A Pi-network

Pi 网络

C

A length of transmission line

传输线长度

D

All these choices are correct

所有这些选项都是正确的

✓ 正确答案

#G5A11🔗

What letter is used to represent reactance?

电抗用什么字母表示？

A

Z

Z

B

X

✓ 正确答案

C

乙

D

Y

是

#G5A12🔗

What occurs in an LC circuit at resonance?

LC 电路谐振时会发生什么？

A

Current and voltage are equal

电流和电压相等

B

Resistance is cancelled

抵抗被取消

C

The circuit radiates all its energy in the form of radio waves

该电路以无线电波的形式辐射其所有能量

D

Inductive reactance and capacitive reactance cancel

感抗和容抗抵消

✓ 正确答案

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