FCC T0B - 电气与射频安全

#T0B01🔗

Which of the following is good practice when installing ground wires on a tower for lightning protection?

在塔上安装地线以防雷击时，以下哪项是好的做法？

Put a drip loop in the ground connection to prevent water damage to the ground system

在接地连接中放置一个滴水环，以防止水损坏接地系统

Make sure all ground wire bends are right angles

确保所有地线弯曲都是直角

Ensure that connections are short and direct

确保连接短而直接

✓ 正确答案

All these choices are correct

这些选项都是正确的

#T0B02🔗

What is required when climbing an antenna tower?

爬天线塔需要什么？

Have sufficient training on safe tower climbing techniques

接受过足够的安全爬塔技术培训

Use appropriate tie-off to the tower at all times

始终使用适当的连接塔

Always wear an approved climbing harness

始终佩戴经认可的攀岩安全带

All these choices are correct

这些选项都是正确的

✓ 正确答案

#T0B03🔗

Under what circumstances is it safe to climb a tower without a helper or observer?

在没有帮助者或观察者的情况下，在什么情况下爬塔是安全的？

When no electrical work is being performed

当没有进行电气工作时

When no mechanical work is being performed

当没有进行机械工作时

When the work being done is not more than 20 feet above the ground

当正在进行的工作距离地面不超过 20 英尺时

Never

绝不

✓ 正确答案

#T0B04🔗

Which of the following is an important safety precaution to observe when putting up an antenna tower?

以下哪项是架设天线塔时应注意的重要安全预防措施？

Wear a ground strap connected to your wrist at all times

始终佩戴连接到手腕的接地带

Insulate the base of the tower to avoid lightning strikes

绝缘塔基，避免雷击

Look for and stay clear of any overhead electrical wires

寻找并远离任何架空电线_

✓ 正确答案

All these choices are correct

这些选项都是正确的

#T0B05🔗

What is the purpose of a safety wire through a turnbuckle used to tension guy lines?

穿过螺丝扣的安全线用于张紧拉线的目的是什么？

Secure the guy line if the turnbuckle breaks

如果螺丝扣断裂，请固定拉绳

Prevent loosening of the turnbuckle from vibration

防止螺丝扣因振动而松动

✓ 正确答案

Provide a ground path for lightning strikes

为雷击提供接地路径

Provide an ability to measure for proper tensioning

提供测量适当张紧的能力

#T0B06🔗

What is the minimum safe distance from a power line to allow when installing an antenna?

安装天线时允许的与电源线的最小安全距离是多少？

Add the height of the antenna to the height of the power line and multiply by a factor of 1.5

将天线的高度与电源线的高度相加并乘以 1.5 倍

The height of the power line above ground

电源线离地高度

1/2 wavelength at the operating frequency

工作频率的 1/2 波长

Enough so that if the antenna falls , no part of it can come within 10 feet of the power wires

足以确保即使天线掉落，其任何部分都不能进入电源线 10 英尺范围内。

✓ 正确答案

#T0B07🔗

Which of the following is an important safety rule to remember when using a crank-up tower?

以下哪项是使用启动塔时要记住的重要安全规则？

This type of tower must never be painted

这种塔绝不能上漆

This type of tower must never be grounded

这种类型的铁塔绝不能接地

This type of tower must not be climbed unless it is retracted , or mechanical safety locking devices have been installed

除非收起或安装了机械安全锁定装置，否则不得攀爬此类塔。

✓ 正确答案

All these choices are correct

这些选项都是正确的

#T0B08🔗

Which is a proper grounding method for a tower?

铁塔正确的接地方式有哪些？

A single four-foot ground rod, driven into the ground no more than 12 inches from the base

一根四英尺长的接地棒，从底座打入地面不超过 12 英寸

A ferrite-core RF choke connected between the tower and ground

连接在塔和地之间的铁氧体磁芯射频扼流圈

A connection between the tower base and a cold-water pipe

塔座与冷水管的连接处

Separate eight-foot ground rods for each tower leg , bonded to the tower and each other

每个塔腿都有独立的8 英尺接地棒，与塔架和彼此相连

✓ 正确答案

#T0B09🔗

Why should you avoid attaching an antenna to a utility pole?

为什么要避免将天线连接到电线杆上？

The antenna will not work properly because of induced voltages

由于感应电压，天线将无法正常工作

The antenna may unbalance the power transformer, causing power fluctuations

天线可能使电源变压器不平衡，造成功率波动

The antenna could contact high -voltage power lines

天线可能会接触到高压电源线

✓ 正确答案

All these choices are correct

这些选项都是正确的

#T0B10🔗

Which of the following is true when installing grounding conductors used for lightning protection?

在安装防雷接地导体时，下列哪项是正确的？

Use only non-insulated wire

仅使用非绝缘电线

Wires must be carefully routed with precise right-angle bends

必须通过精确的直角弯曲仔细布线

Sharp bends must be avoided

必须避免急转弯

✓ 正确答案

Common grounds must be avoided

必须避免共同点

#T0B11🔗

Which of the following establishes grounding requirements for an amateur radio tower or antenna?

以下哪项规定了业余无线电塔或天线的接地要求？

FCC Part 97 rules

FCC 第 97 部分规则

Local electrical codes

当地电气规范

✓ 正确答案

FAA tower lighting regulations

美国联邦航空局塔楼照明规定

UL recommended practices

UL 推荐做法

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FCC T0B - 电气与射频安全

小节 T0B：电气与射频安全