FCC G5C - 电路与电学原理

#G5C01🔗

What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding?

当交流电压源连接到变压器的初级绕组时，是什么导致变压器的次级绕组上出现电压？

Capacitive coupling

电容耦合

Displacement current coupling

位移电流耦合

Mutual inductance

互感

✓ 正确答案

Mutual capacitance

互电容

#G5C02🔗

What is the output voltage if an input signal is applied to the secondary winding of a 4:1 voltage step-down transformer instead of the primary winding?

如果将输入信号施加到 4:1 降压变压器的次级绕组而不是初级绕组，输出电压是多少？

The input voltage is multiplied by 4

输入电压乘以4

✓ 正确答案

The input voltage is divided by 4

输入电压除以4

Additional resistance must be added in series with the primary to prevent overload

必须与初级串联添加额外电阻以防止过载

Additional resistance must be added in parallel with the secondary to prevent overload

必须在次级并联附加电阻以防止过载

#G5C03🔗

What is the total resistance of a 10-, a 20-, and a 50-ohm resistor connected in parallel?

并联一个 10 欧姆、一个 20 欧姆和一个 50 欧姆电阻的总电阻是多少？

5 . 9 ohms

5. 9欧姆

✓ 正确答案

0.17 ohms

0.17欧姆

17 ohms

17欧姆

80 ohms

80欧姆

#G5C04🔗

What is the approximate total resistance of a 100- and a 200-ohm resistor in parallel?

100 欧姆和 200 欧姆电阻并联后的总电阻大约是多少？

300 ohms

300欧姆

150 ohms

150欧姆

75 ohms

75欧姆

67 ohms

67欧姆

✓ 正确答案

#G5C05🔗

Why is the primary winding wire of a voltage step-up transformer usually a larger size than that of the secondary winding?

为什么升压变压器的初级绕组线径通常比次级绕组的线径大？

To improve the coupling between the primary and secondary

改善初级和次级之间的耦合

To accommodate the higher current of the primary

为了适应初级的较高电流

✓ 正确答案

To prevent parasitic oscillations due to resistive losses in the primary

为了防止由于初级电阻损耗而产生寄生振荡

To ensure that the volume of the primary winding is equal to the volume of the secondary winding

确保初级绕组的体积等于次级绕组的体积

#G5C06🔗

What is the voltage output of a transformer with a 500-turn primary and a 1500-turn secondary when 120 VAC is applied to the primary?

当初级侧施加 120 VAC 电压时，初级侧为 500 匝、次级侧为 1500 匝的变压器的电压输出是多少？

360 volts

360伏

✓ 正确答案

120 volts

120伏

40 volts

40伏

25.5 volts

25.5伏

#G5C07🔗

What transformer turns ratio matches an antenna’s 600-ohm feed point impedance to a 50-ohm coaxial cable?

天线的 600 欧姆馈电点阻抗与 50 欧姆同轴电缆的变压器匝数比是多少？

3 . 5 to 1

3. 5比1

✓ 正确答案

12 to 1

12比1

24 to 1

24比1

144 to 1

144 比 1

#G5C08🔗

What is the equivalent capacitance of two 5.0-nanofarad capacitors and one 750-picofarad capacitor connected in parallel?

两个5.0纳法电容和一个750皮法电容并联的等效电容是多少？

576.9 nanofarads

576.9纳法

1,733 picofarads

1,733 皮法

3,583 picofarads

3,583 皮法

10 . 750 nanofarads

10. 750纳法

✓ 正确答案

#G5C09🔗

What is the capacitance of three 100-microfarad capacitors connected in series?

三个100微法电容串联的电容是多少？

0.33 microfarads

0.33微法拉

3.0 microfarads

3.0微法拉

33.3 microfarads

33.3微法拉

✓ 正确答案

300 microfarads

300微法拉

#G5C10🔗

What is the inductance of three 10-millihenry inductors connected in parallel?

三个10毫亨电感并联的电感是多少？

0.30 henries

0.30 亨利

3.3 henries

3.3 亨利

3.3 millihenries

3.3毫亨

✓ 正确答案

30 millihenries

30毫亨

#G5C11🔗

What is the inductance of a circuit with a 20-millihenry inductor connected in series with a 50-millihenry inductor?

20毫亨电感与50毫亨电感串联的电路的电感是多少？

7 millihenries

7毫亨

14.3 millihenries

14.3毫亨

70 millihenries

70毫亨

✓ 正确答案

1,000 millihenries

1,000 毫亨

#G5C12🔗

What is the capacitance of a 20-microfarad capacitor connected in series with a 50-microfarad capacitor?

20微法电容与50微法电容串联的电容是多少？

0.07 microfarads

0.07微法拉

14 . 3 microfarads

14. 3微法拉

✓ 正确答案

70 microfarads

70微法拉

1,000 microfarads

1,000 微法拉

#G5C13🔗

Which of the following components should be added to a capacitor to increase the capacitance?

为了增大电容，应在电容器中添加以下哪种元件？

An inductor in series

串联一个电感

An inductor in parallel

并联一个电感

A capacitor in parallel

并联一个电容

✓ 正确答案

A capacitor in series

串联一个电容器

#G5C14🔗

Which of the following components should be added to an inductor to increase the inductance?

为了增加电感量，应在电感器中添加以下哪种元件？

A capacitor in series

串联一个电容器

A capacitor in parallel

并联一个电容

An inductor in parallel

并联一个电感

An inductor in series

串联一个电感

✓ 正确答案

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FCC G5C - 电路与电学原理

小节 G5C：电路与电学原理