FCC T7D - 电台设备与故障排查

#T7D01🔗

Which instrument would you use to measure electric potential?

你会用什么仪器来测量电势？

An ammeter

电流表

A voltmeter

电压表

✓ 正确答案

A potentiometer

电位器一个

An ohmmeter

欧姆表

#T7D02🔗

How is a voltmeter connected to a component to measure applied voltage?

电压表如何连接到元件以测量施加的电压？

In series

串联

In parallel

并联

✓ 正确答案

In quadrature

在正交

In phase

同相

#T7D03🔗

When configured to measure current, how is a multimeter connected to a component?

当配置为测量电流时，万用表如何连接到元件？

In series

串联

✓ 正确答案

In parallel

并联

In quadrature

在正交

In phase

同相

#T7D04🔗

Which instrument is used to measure electric current?

什么仪器是用来测量电流的？

An ohmmeter

欧姆表

An electrometer

静电计

A voltmeter

电压表

An ammeter

电流表_

✓ 正确答案

#T7D05🔗

How does an ohmmeter measure the resistance of a circuit or component?

欧姆表如何测量电路或元件的电阻？

By applying a small current and measuring the resulting voltage

通过施加小电流并测量产生的电压

✓ 正确答案

By placing a variable resistor in parallel with the circuit

通过在电路中并联一个可变电阻

By placing a variable resistor in series with the circuit

通过在电路中串联一个可变电阻

By applying a variable voltage and measuring the resulting current change

通过施加可变电压并测量由此产生的电流变化

#T7D06🔗

Which of the following can damage a multimeter?

以下哪项会损坏万用表？

Attempting to measure resistance using the voltage setting

尝试使用电压设置测量电阻

Failing to connect one of the probes to ground

未能将其中一个探头接地

Attempting to measure voltage when using the resistance setting

使用电阻设置时尝试测量电压

✓ 正确答案

Not allowing it to warm up properly

不允许它正常预热

#T7D07🔗

Which of the following measurements are made using a multimeter?

以下哪些测量是使用万用表进行的？

Signal strength and noise

信号强度和噪声

Impedance and reactance

阻抗和电抗

Voltage and resistance

电压和电阻

✓ 正确答案

All these choices are correct

这些选项都是正确的

#T7D08🔗

Which of the following types of solder should not be used for radio and electronic applications?

以下哪种类型的焊料不应用于无线电和电子应用？

Acid -core solder

酸芯焊锡

✓ 正确答案

Lead-tin solder

铅锡焊料

Rosin-core solder

松香芯焊锡

Tin-copper solder

锡铜焊料

#T7D09🔗

What is the characteristic appearance of a cold tin-lead solder joint?

冷锡铅焊点的特征外观是什么？

Dark black spots

深黑色斑点

A bright or shiny surface

明亮或有光泽的表面

A rough or lumpy surface

粗糙或凹凸不平的表面

✓ 正确答案

A greenish tinge

带有绿色调

#T7D10🔗

What reading indicates that an ohmmeter is connected across a large, discharged capacitor?

什么读数表明欧姆表连接在一个大的放电电容器上？

Increasing resistance with time

抵抗力随时间增加

✓ 正确答案

Decreasing resistance with time

随着时间的推移抵抗力下降

Steady full-scale reading

稳定满刻度读数

Alternating between open and short circuit

在开路和短路之间交替

#T7D11🔗

Which of the following precautions should be taken when measuring in-circuit resistance with an ohmmeter?

用欧姆表测量在线电阻时应注意以下哪些事项？

Ensure that the applied voltages are correct

确保施加的电压正确

Ensure that the circuit is not powered

确保电路未通电

✓ 正确答案

Ensure that the circuit is grounded

确保电路接地

Ensure that the circuit is operating at the correct frequency

确保电路工作在正确的频率

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FCC T7D - 电台设备与故障排查

小节 T7D：电台设备与故障排查