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FCC E7A - 实用射频电路与滤波器

FCC 题库总览 > E级 (最高特级 Extra) > E7 实用射频电路与滤波器 > E7A

小节 E7A:实用射频电路与滤波器

本小节共包含 11 道中英双语精校考题
#E7A01🔗
Which circuit is bistable?
哪个电路是双稳态的?
A
An AND gate
与门
B
An OR gate
或门
C
A flip - flop
一个触发器
✓ 正确答案
D
A bipolar amplifier
双极放大器
#E7A02🔗
What is the function of a decade counter?
十年计数器的作用是什么?
A
It produces one output pulse for every 10 input pulses
每 10 个输入脉冲产生 1 个输出脉冲
✓ 正确答案
B
It decodes a decimal number for display on a seven-segment LED display
它解码十进制数以显示在七段 LED 显示屏上
C
It produces 10 output pulses for every input pulse
每个输入脉冲产生 10 个输出脉冲
D
It decodes a binary number for display on a seven-segment LED display
它解码二进制数以显示在七段 LED 显示屏上
#E7A03🔗
Which of the following can divide the frequency of a pulse train by 2?
以下哪项可以将脉冲串的频率除以 2?
A
An XOR gate
异或门
B
A flip - flop
一个触发器
✓ 正确答案
C
An OR gate
或门
D
A multiplexer
多路复用器
#E7A04🔗
How many flip-flops are required to divide a signal frequency by 16?
将信号频率除以 16 需要多少个触发器?
A
4
4
✓ 正确答案
B
6
6
C
8
8
D
16
16
#E7A05🔗
Which of the following circuits continuously alternates between two states without an external clock signal?
以下哪一个电路在没有外部时钟信号的情况下在两种状态之间连续交替?
A
Monostable multivibrator
单稳态多谐振荡器
B
J-K flip-flop
J-K触发器
C
T flip-flop
T触发器
D
Astable multivibrator
非稳态多谐振荡器
✓ 正确答案
#E7A06🔗
What is a characteristic of a monostable multivibrator?
单稳态多谐振荡器有什么特点?
A
It switches temporarily to an alternate state for a set time
在设定的时间内暂时切换到备用状态
✓ 正确答案
B
It produces a continuous square wave
它产生连续的方波
C
It stores one bit of data
它存储一位数据
D
It maintains a constant output voltage, regardless of variations in the input voltage
无论输入电压如何变化,它都能保持恒定的输出电压
#E7A07🔗
What logical operation does a NAND gate perform?
与非门执行什么逻辑操作?
A
It produces a 0 at its output only if all inputs are 0
仅当所有输入均为 0 时,它才会在输出处生成 0
B
It produces a 1 at its output only if all inputs are 1
仅当所有输入均为 1 时,它才会在输出处生成 1
C
It produces a 0 at its output if some but not all inputs are 1
如果某些但不是全部输入为 1,则它会在输出处生成 0
D
It produces a 0 at its output only if all inputs are 1
仅当所有输入均为 1 时,它才会在输出处生成 0
✓ 正确答案
#E7A08🔗
What logical operation does an OR gate perform?
或门执行什么逻辑运算?
A
It produces a 1 at its output if any input is 1
如果任何输入为 1,则它会在输出处生成 1
✓ 正确答案
B
It produces a 0 at its output if all inputs are 1
如果所有输入均为 1,则它在输出处生成 0
C
It produces a 0 at its output if some but not all inputs are 1
如果某些但不是全部输入为 1,则它会在输出处生成 0
D
It produces a 1 at its output if all inputs are 0
如果所有输入均为 0,则它在输出处生成 1
#E7A09🔗
What logical operation is performed by a two-input exclusive NOR gate?
二输入异或非门执行什么逻辑运算?
A
It produces a 0 at its output only if all inputs are 0
仅当所有输入均为 0 时,它才会在输出处生成 0
B
It produces a 1 at its output only if all inputs are 1
仅当所有输入均为 1 时,它才会在输出处生成 1
C
It produces a 0 at its output if one and only one of its inputs is 1
如果一个且只有一个输入为 1,则它会在输出处生成 0
✓ 正确答案
D
It produces a 1 at its output if one and only one input is 1
如果一个且只有一个输入为 1,则它会在输出处生成 1
#E7A10🔗
What is a truth table?
什么是真值表?
A
A list of inputs and corresponding outputs for an op-amp
运算放大器的输入和相应输出的列表
B
A list of inputs and corresponding outputs for a digital device
数字设备的输入和相应输出的列表
✓ 正确答案
C
A diagram showing logic states when the digital gate output is true
显示数字门输出为真时的逻辑状态的图表
D
A table of logic symbols that indicate the logic states of an op-amp
指示运算放大器逻辑状态的逻辑符号表
#E7A11🔗
What does “positive logic” mean in reference to logic devices?
逻辑器件中的“正逻辑”是什么意思?
A
The logic devices have high noise immunity
逻辑器件具有高抗扰度
B
High voltage represents a 1 , low voltage a 0
高电压代表1,低电压代表0
✓ 正确答案
C
The logic circuit is in the “true” condition
逻辑电路处于“真”状态
D
1s and 0s are defined as different positive voltage levels
1和0被定义为不同的正电压电平
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