FCC E0A - 安全操作与射频暴露防护

#E0A01🔗

What is the primary function of an external earth connection or ground rod?

外部接地连接或接地棒的主要功能是什么？

Prevent static build up on power lines

防止电源线上静电积聚

Lightning charge dissipation

雷击电荷耗散

✓ 正确答案

Reduce RF current flow between pieces of equipment

减少设备之间的射频电流

Protect breaker panel from power surges

保护断路器面板免受电涌影响

#E0A02🔗

When evaluating RF exposure levels from your station at a neighbor’s home, what must you do?

当评估您的电台在邻居家中的射频暴露水平时，您必须做什么？

Ensure signals from your station are less than the controlled maximum permissible exposure (MPE) limits

确保来自您的站的信号小于受控的最大允许暴露 (MPE) 限制

Ensure signals from your station are less than the uncontrolled maximum permissible exposure (MPE) limits

确保来自您的站的信号小于不受控制的最大允许暴露 (MPE) 限制

✓ 正确答案

Ensure signals from your station are less than the controlled maximum permissible emission (MPE) limits

确保来自您的电台的信号低于受控的最大允许发射 (MPE) 限制

Ensure signals from your station are less than the uncontrolled maximum permissible emission (MPE) limits

确保来自您的电台的信号低于不受控制的最大允许发射 (MPE) 限制

#E0A03🔗

Over what range of frequencies are the FCC human body RF exposure limits most restrictive?

FCC 人体射频暴露限制在什么频率范围内最严格？

300 kHz - 3 MHz

300kHz - 3MHz

3 - 30 MHz

3 - 30兆赫

30 - 300 MHz

30 - 300 兆赫

✓ 正确答案

300 - 3000 MHz

300 - 3000兆赫

#E0A04🔗

When evaluating a site with multiple transmitters operating at the same time, the operators and licensees of which transmitters are responsible for mitigating over-exposure situations?

在评估同时运行多个发射器的站点时，哪些发射器的运营商和许可证持有者负责缓解过度暴露情况？

Each transmitter that produces 20 percent or more of its MPE limit in areas where the total MPE limit is exceeded

在超出总 MPE 限制的区域中产生 20% 或更多其 MPE 限制的每个发射机

Each transmitter operating with a duty cycle greater than 25 percent

每个发射器的工作占空比大于 25%

Each transmitter that produces 5 percent or more of its MPE limit in areas where the total MPE limit is exceeded

每个发射机在超过总 MPE 限制的区域中产生其 MPE 限制的 5% 或更多

✓ 正确答案

Each transmitter operating with a duty cycle greater than 50 percent

每个发射器的工作占空比大于 50%

#E0A05🔗

What hazard is created by operating at microwave frequencies?

在微波频率下操作会产生什么危险？

Microwaves are ionizing radiation

微波属于电离辐射

The high gain antennas commonly used can result in high exposure levels

常用的高增益天线会导致高暴露水平

✓ 正确答案

Microwaves are in the frequency range where wave velocity is higher

微波处于波速较高的频率范围

The extremely high frequency energy can damage the joints of antenna structures

极高的频率能量会损坏天线结构的接头

#E0A06🔗

Why are there separate electric (E) and magnetic (H) MPE limits at frequencies below 300 MHz?

为什么频率低于 300 MHz 时有单独的电 (E) 和磁 (H) MPE 限制？

The body reacts to electromagnetic radiation from both the E and H fields

身体对来自 E 场和 H 场的电磁辐射做出反应

Ground reflections and scattering cause the field strength to vary with location

地面反射和散射导致场强随位置变化

E field and H field radiation intensity peaks can occur at different locations

E 场和 H 场辐射强度峰值可能出现在不同位置

All these choices are correct

所有这些选项都是正确的

✓ 正确答案

#E0A07🔗

What is meant by “100% tie-off” regarding tower safety?

关于塔架安全的“100% 系紧”是什么意思？

All loose ropes and guys secured to a fixed structure

所有松散的绳索和人员均固定在固定结构上

At least one lanyard attached to the tower at all times

至少一根挂绳始终固定在塔上

✓ 正确答案

All tools secured to the climber’s harness

所有工具均固定在登山者的安全带上

All circuit breakers feeding power to the tower must be tied closed with tape, cable, or ties

所有向塔供电的断路器必须用胶带、电缆或扎带绑紧

#E0A08🔗

What does SAR measure?

SAR 衡量什么？

Signal attenuation ratio

信号衰减比

Signal amplification rating

信号放大等级

The rate at which RF energy is absorbed by the body

射频能量被身体吸收的速率

✓ 正确答案

The rate of RF energy reflected from stationary terrain

从静止地形反射射频能量的比率

#E0A09🔗

Which of the following types of equipment are exempt from RF exposure evaluations?

以下哪些类型的设备可以免于射频暴露评估？

Transceivers with less than 7 watts of RF output

RF 输出低于 7 瓦的收发器

Antennas that radiate only in the near field

仅在近场辐射的天线

Hand - held transceivers sold before May 3 , 2021

2021 年 5 月 3 日之前销售的手持式收发器

✓ 正确答案

Dish antennas less than one meter in diameter

直径小于一米的碟形天线

#E0A10🔗

When must an RF exposure evaluation be performed on an amateur station operating on 80 meters?

何时必须对 80 米外的业余电台进行射频暴露评估？

An evaluation must always be performed

必须始终进行评估

✓ 正确答案

When the ERP of the station is less than 10 watts

当站点ERP小于10瓦时

When the station’s operating mode is CW

当电台工作模式为 CW 时

When the output power from the transmitter is less than 100 watts

当发射机输出功率小于100瓦时

#E0A11🔗

To what should lanyards be attached while climbing?

攀岩时挂绳应该系在什么东西上？

Antenna mast

天线杆

Guy brackets

拉线括号

Tower rungs

塔梯级

Tower legs

塔腿

✓ 正确答案

#E0A12🔗

Where should a shock-absorbing lanyard be attached to a tower when working above ground?

地面作业时，减震挂绳应连接到塔架的什么位置？

Above the climber’s head level

高于登山者的头部高度

✓ 正确答案

To the belt of the fall-arrest harness

至防坠落安全带的腰带

Even with the climber's waist

即使有登山者的腰

To the next lowest set of guys

致下一个最低组的人

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FCC E0A - 安全操作与射频暴露防护

小节 E0A：安全操作与射频暴露防护