FCC T0C - 电气与射频安全

#T0C01🔗

What type of radiation are radio signals?

无线电信号是什么类型的辐射？

Gamma radiation

伽马辐射

Ionizing radiation

电离辐射

Alpha radiation

阿尔法辐射

Non-ionizing radiation

非电离辐射

✓ 正确答案

#T0C02🔗

Which of the following bands has the lowest maximum permissible exposure for RF safety?

以下哪个频段的射频安全最大允许暴露量最低？

3.5 MHz

3.5兆赫

50 MHz

50兆赫

✓ 正确答案

440 MHz

440兆赫

1296 MHz

1296兆赫

#T0C03🔗

How does the allowable power density for RF safety change if duty cycle changes from 100 percent to 50 percent?

如果占空比从 100% 变为 50%，RF 安全允许的功率密度将如何变化？

It increases by a factor of 3

它增加了 3 倍

It decreases by 50 percent

它减少了 50%

It increases by a factor of 2

它增加了2 倍

✓ 正确答案

There is no adjustment allowed for lower duty cycle

不允许对较低的占空比进行调整

#T0C04🔗

What factors affect the RF exposure of people near an amateur station antenna?

哪些因素会影响人们在业余电台天线附近的 RF 暴露？

Frequency and power level of the RF field

射频场的频率和功率水平

Distance from the antenna to a person

天线到人的距离

Radiation pattern of the antenna

天线的辐射方向图

All these choices are correct

这些选项都是正确的

✓ 正确答案

#T0C05🔗

Why do exposure limits vary with frequency?

为什么暴露限值会随频率变化？

Lower frequency RF fields have more energy than higher frequency fields

低频射频场比高频场具有更多能量

Lower frequency RF fields do not penetrate the human body

低频射频场不会穿透人体

Higher frequency RF fields are transient in nature

较高频率的射频场本质上是瞬态的

The human body absorbs more RF energy at some frequencies than at others

人体在某些频率比其他频率吸收更多的射频能量

✓ 正确答案

#T0C06🔗

Which of the following is an acceptable method to determine whether your station complies with FCC RF exposure regulations?

以下哪项是确定您的电台是否符合 FCC RF 暴露规定的可接受方法？

By calculation based on FCC OET Bulletin 65

根据 FCC OET Bulletin 65 计算

By calculation based on computer modeling

通过基于计算机建模的计算

By measurement of field strength using calibrated equipment

通过使用校准设备测量场强

All these choices are correct

这些选项都是正确的

✓ 正确答案

#T0C07🔗

What hazard is created by touching an antenna during a transmission?

在传输过程中触摸天线会产生什么危险？

Electrocution

电刑

RF burn to skin

射频灼伤皮肤_

✓ 正确答案

Exposure to ionizing radiation

暴露于电离辐射

All these choices are correct

这些选项都是正确的

#T0C08🔗

Which of the following actions can reduce exposure to RF radiation?

以下哪项措施可以减少射频辐射的暴露？

Relocate antennas

重新安置天线

✓ 正确答案

Relocate the transmitter

重新定位发射器

Increase the duty cycle

增加占空比

All these choices are correct

这些选项都是正确的

#T0C09🔗

How can you make sure your station stays in compliance with RF safety regulations?

您如何确保您的站点始终符合 RF 安全法规？

By informing the FCC of any changes made in your station

通过通知 FCC 您的电台所做的任何更改

By re- evaluating the station whenever an item in the transmitter or antenna system is changed

每当发射器或天线系统中的项目发生变化时，通过重新评估站点

✓ 正确答案

By making sure your antennas have low SWR

通过确保您的天线具有低 SWR

By using only Underwriter Laboratories approved transmitting equipment

仅使用 Underwriter Laboratories 批准的传输设备

#T0C10🔗

Why is duty cycle one of the factors used to determine safe RF radiation exposure levels?

为什么占空比是确定安全射频辐射暴露水平的因素之一？

It affects the average exposure to radiation

它影响平均辐射暴露

✓ 正确答案

It affects the peak exposure to radiation

它影响辐射的峰值暴露

It takes into account the antenna feed line loss

它考虑了天线馈线损耗

It takes into account the thermal effects of the final amplifier

它考虑了末级放大器的热效应

#T0C11🔗

What is the definition of duty cycle during the averaging time for RF exposure?

RF 暴露的平均时间内占空比的定义是什么？

The difference between the lowest and highest power output of a transmitter

发射机的最低功率输出和最高功率输出之间的差异

The difference between the PEP and the average power output of a transmitter

发射机的 PEP 和平均功率输出之间的差异

The percentage of time that a transmitter is transmitting

发射机发射的时间百分比

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The percentage of time that a transmitter is not transmitting

发射机不发射的时间百分比

#T0C12🔗

How does RF radiation differ from ionizing radiation (radioactivity)?

射频辐射与电离辐射（放射性）有何不同？

RF radiation does not have sufficient energy to cause chemical changes in cells and damage DNA

射频辐射没有足够的能量引起细胞化学变化和损伤DNA

✓ 正确答案

RF radiation can only be detected with an RF dosimeter

射频辐射只能用射频剂量计检测

RF radiation is limited in range to a few feet

RF 辐射范围限制在几英尺内

RF radiation is perfectly safe

射频辐射是绝对安全的

#T0C13🔗

Who is responsible for ensuring that no person is exposed to RF energy above the FCC exposure limits?

谁负责确保没有人接触到超过 FCC 接触限值的射频能量？

The FCC

美国联邦通讯委员会

The station licensee

电台持牌人

✓ 正确答案

Anyone who is near an antenna

靠近天线的任何人

The local zoning board

地方分区委员会

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FCC T0C - 电气与射频安全

小节 T0C：电气与射频安全