FCC G5B - 电路与电学原理

#G5B01🔗

What dB change represents a factor of two increase or decrease in power?

什么 dB 变化代表功率增加或减少两倍？

Approximately 2 dB

约2分贝

Approximately 3 dB

约3分贝

✓ 正确答案

Approximately 6 dB

约 6 分贝

Approximately 9 dB

约 9 分贝

#G5B02🔗

How does the total current relate to the individual currents in a circuit of parallel resistors?

总电流与并联电阻电路中的各个电流有何关系？

It equals the average of the branch currents

它等于支路电流的平均值

It decreases as more parallel branches are added to the circuit

随着更多并行分支添加到电路中，它会减少

It equals the sum of the currents through each branch

它等于通过每个支路的电流之和

✓ 正确答案

It is the sum of the reciprocal of each individual voltage drop

它是每个单独电压降的倒数之和

#G5B03🔗

How many watts of electrical power are consumed if 400 VDC is supplied to an 800-ohm load?

如果向 800 欧姆负载提供 400 VDC 电压，会消耗多少瓦电力？

0.5 watts

0.5瓦

200 watts

200瓦

✓ 正确答案

400 watts

400瓦

3200 watts

3200瓦

#G5B04🔗

How many watts of electrical power are consumed by a 12 VDC light bulb that draws 0.2 amperes?

一个 0.2 安培的 12 VDC 灯泡消耗多少瓦的电力？

2 . 4 watts

2. 4瓦

✓ 正确答案

24 watts

24瓦

6 watts

6瓦

60 watts

60瓦

#G5B05🔗

How many watts are consumed when a current of 7.0 milliamperes flows through a 1,250-ohm resistance?

当 7.0 毫安的电流流过 1,250 欧姆的电阻时，会消耗多少瓦特？

Approximately 61 milliwatts

约61毫瓦

✓ 正确答案

Approximately 61 watts

约61瓦

Approximately 11 milliwatts

约11毫瓦

Approximately 11 watts

约11瓦

#G5B06🔗

What is the PEP produced by 200 volts peak-to-peak across a 50-ohm dummy load?

50 欧姆假负载上 200 伏峰峰值产生的 PEP 是多少？

1.4 watts

1.4瓦

100 watts

100瓦

✓ 正确答案

353.5 watts

353.5瓦

400 watts

400瓦

#G5B07🔗

What value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value?

多大的交流信号值在电阻器中产生与相同值的直流电压相同的功耗？

The peak-to-peak value

峰峰值

The peak value

峰值

The RMS value

有效值

✓ 正确答案

The reciprocal of the RMS value

RMS 值的倒数

#G5B08🔗

What is the peak-to-peak voltage of a sine wave with an RMS voltage of 120 volts?

RMS 电压为 120 伏的正弦波的峰峰值电压是多少？

84.8 volts

84.8伏

169.7 volts

169.7伏

240.0 volts

240.0伏

339 . 4 volts

339. 4伏

✓ 正确答案

#G5B09🔗

What is the RMS voltage of a sine wave with a value of 17 volts peak?

峰值为 17 伏的正弦波的 RMS 电压是多少？

8.5 volts

8.5伏

12 volts

12伏

✓ 正确答案

24 volts

24伏

34 volts

34伏

#G5B10🔗

What percentage of power loss is equivalent to a loss of 1 dB?

多少百分比的功率损耗相当于 1 dB 的损耗？

10.9 percent

10.9%

12.2 percent

12.2%

20 . 6 percent

20. 6%

✓ 正确答案

25.9 percent

25.9%

#G5B11🔗

What is the ratio of PEP to average power for an unmodulated carrier?

未调制载波的 PEP 与平均功率之比是多少？

0.707

1.00

✓ 正确答案

1.414

2.00

#G5B12🔗

What is the RMS voltage across a 50-ohm dummy load dissipating 1200 watts?

耗散 1200 瓦功率的 50 欧姆假负载上的 RMS 电压是多少？

173 volts

173伏

245 volts

245伏

✓ 正确答案

346 volts

346伏

692 volts

692伏

#G5B13🔗

What is the output PEP of an unmodulated carrier if the average power is 1060 watts?

如果平均功率为 1060 瓦，则未调制载波的输出 PEP 是多少？

530 watts

530瓦

1060 watts

1060瓦

✓ 正确答案

1500 watts

1500瓦

2120 watts

2120瓦

#G5B14🔗

What is the output PEP of 500 volts peak-to-peak across a 50-ohm load?

50 欧姆负载上 500 伏峰峰值的输出 PEP 是多少？

8.75 watts

8.75瓦

625 watts

625瓦

✓ 正确答案

2500 watts

2500瓦

5000 watts

5000瓦

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FCC G5B - 电路与电学原理

小节 G5B：电路与电学原理