FCC G0B - 电气与射频安全

#G0B01🔗

Which wire or wires in a four-conductor 240 VAC circuit should be attached to fuses or circuit breakers?

四芯 240 VAC 电路中的哪一根或多根电线应连接到保险丝或断路器？

Only the hot wires

只有热线

✓ 正确答案

Only the neutral wire

只有零线

Only the ground wire

仅接地线

All wires

所有电线

#G0B02🔗

According to the National Electrical Code, what is the minimum wire size that may be used safely for wiring with a 20-ampere circuit breaker?

根据国家电气规范，可安全用于 20 安培断路器接线的最小电线尺寸是多少？

AWG number 20

AWG 编号 20

AWG number 16

AWG 编号 16

AWG number 12

AWG 编号 12

✓ 正确答案

AWG number 8

AWG 编号 8

#G0B03🔗

Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?

哪种尺寸的保险丝或断路器适合与使用 AWG 14 接线的电路一起使用？

30 amperes

30安培

25 amperes

25安培

20 amperes

20安培

15 amperes

15安培

✓ 正确答案

#G0B04🔗

Where should the station’s lightning protection ground system be located?

车站的防雷接地系统应设置在哪里？

As close to the station equipment as possible

尽可能靠近车站设备

Outside the building

大楼外

✓ 正确答案

Next to the closest power pole

靠近最近的电线杆

Parallel to the water supply line

与供水管线平行

#G0B05🔗

Which of the following conditions will cause a ground fault circuit interrupter (GFCI) to disconnect AC power?

以下哪种情况会导致接地故障断路器 (GFCI) 断开交流电源？

Current flowing from one or more of the hot wires to the neutral wire

电流从一根或多根火线流向中性线

Current flowing from one or more of the hot wires directly to ground

电流从一根或多根热线直接流向地面

✓ 正确答案

Overvoltage on the hot wires

热线上过压

All these choices are correct

所有这些选项都是正确的

#G0B06🔗

Which of the following is covered by the National Electrical Code?

《国家电气规范》涵盖以下哪项？

Acceptable bandwidth limits

可接受的带宽限制

Acceptable modulation limits

可接受的调制限制

Electrical safety of the station

车站用电安全

✓ 正确答案

RF exposure limits of the human body

人体射频暴露限值

#G0B07🔗

Which of these choices should be observed when climbing a tower using a safety harness?

使用安全带爬塔时应遵守以下哪些选择？

Always hold on to the tower with one hand

始终用一只手握住塔

Confirm that the harness is rated for the weight of the climber and that it is within its allowable service life

确认安全带的额定重量适合登山者的重量，并且在允许的使用寿命内

✓ 正确答案

Ensure that all heavy tools are securely fastened to the harness

确保所有重型工具均牢固地固定在安全带上

All these choices are correct

所有这些选项都是正确的

#G0B08🔗

What should be done before climbing a tower that supports electrically powered devices?

在爬上支撑电动设备的塔之前应该做什么？

Notify the electric company that a person will be working on the tower

通知电力公司将有人在塔上工作

Make sure all circuits that supply power to the tower are locked out and tagged

确保为塔供电的所有电路都已锁定并贴有标签

✓ 正确答案

Unground the base of the tower

拔掉塔基的地面

All these choices are correct

所有这些选项都是正确的

#G0B09🔗

Which of the following is true of an emergency generator installation?

关于应急发电机安装，以下哪一项是正确的？

The generator should be operated in a well- ventilated area

发电机应在通风良好的地方运行

✓ 正确答案

The generator must be insulated from ground

发电机必须与地绝缘

Fuel should be stored near the generator for rapid refueling in case of an emergency

燃料应存放在发电机附近，以便在紧急情况下快速补充燃料

All these choices are correct

所有这些选项都是正确的

#G0B10🔗

Which of the following is a danger from lead-tin solder?

以下哪项是铅锡焊料的危险？

Lead can contaminate food if hands are not washed carefully after handling the solder

如果处理焊料后不仔细洗手，铅可能会污染食物

✓ 正确答案

High voltages can cause lead-tin solder to disintegrate suddenly

高电压会导致铅锡焊料突然分解

Tin in the solder can “cold flow,” causing shorts in the circuit

焊料中的锡会“冷流”，导致电路短路

RF energy can convert the lead into a poisonous gas

射频能量可以将铅转化为有毒气体

#G0B11🔗

Which of the following is required for lightning protection ground rods?

防雷接地棒需要满足以下哪些要求？

They must be bonded to all buried water and gas lines

它们必须连接到所有埋地水和天然气管线

Bends in ground wires must be made as close as possible to a right angle

接地线的弯曲必须尽可能接近直角

Lightning grounds must be connected to all ungrounded wiring

雷电接地必须连接到所有未接地的接线

They must be bonded together with all other grounds

它们必须与所有其他接地连接在一起

✓ 正确答案

#G0B12🔗

What is the purpose of a power supply interlock?

电源联锁的目的是什么？

To prevent unauthorized changes to the circuit that would void the manufacturer’s warranty

防止对电路进行未经授权的更改，从而导致制造商的保修失效

To shut down the unit if it becomes too hot

如果设备变得太热，请关闭设备

To ensure that dangerous voltages are removed if the cabinet is opened

确保在打开机柜时消除危险电压

✓ 正确答案

To shut off the power supply if too much voltage is produced

如果产生过高电压，请关闭电源

#G0B13🔗

Where should lightning arrestors be located?

避雷器应该安装在哪里？

Where the feed lines enter the building

馈电线进入建筑物的位置

✓ 正确答案

On the antenna, opposite the feed point

在天线上，馈电点对面

In series with each ground lead

与每根接地线串联

At the closest power pole ground electrode

在最近的电源杆接地电极处

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FCC G0B - 电气与射频安全

小节 G0B：电气与射频安全