大学MOOC Holistic Circuitry, A Practical Approach(East China Normal University)1461324169 最新慕课完整章节测试答案
Chapter 10 Determind location of sound sources with transistors or OP AMP
文章目录
- Chapter 10 Determind location of sound sources with transistors or OP AMP
- Chapter 11 Breathing LED Light with OP-AMPs, Comparators and Integrators
- Chapter 12 Clap Counting Circuit Where Digital Circuit and Analog Circuit Work Together
- Chapter 13 Running LED Lanterns - Digital Logic Circuit
- Chapter 14 Noise Reduction with Dual-microphone
- Chapter 2 Learn the Principles of Diodes Easily and Joyfully
- Chapter 3 The Concept of Impedance
- Chapter 4 BJ Transistor Man Model
- Chapter 5 The Test of Induced Current in Human Body
- Chapter 6 Transistor Switch and Oscillation
- Chapter 7 Linear Regulated Power Supply with Transistors
- Chapter 8 Rhythmic LED arrays with Transistors
- Chapter 9 Principles of Operational amplifiers
Quiz on OPAMP sound source
1、单选题：
In the schematic diagram of sound source location of operational amplifier, if R1 is short-circuited, what is likely to happen?
选项：
A: The voltage of out1 will increase
B: The microphone will be damaged
C: E3 will be burned
D: R6 will be burned
答案: 【 The microphone will be damaged】
2、单选题：
In the schematic diagram of sound source location of operational amplifier, if the microphone is reversed, what is likely to happen?
选项：
A: The voltage of out1 will decrease
B: The microphone will be damaged
C: The voltage on MIC is about 0.1V
D: The voltage on MIC is about 5V
答案: 【 The voltage on MIC is about 0.1V】
3、单选题：
In the schematic diagram of sound source location of operational amplifier, if the static voltage of OUT1 is 1V, what is the reason?
选项：
A: The resistance of R5 increased
B: The resistance of R4 increased
C: The resistance of R3 decreased
D: The voltage at the top of the microphone, MIC is 5V
答案: 【 The resistance of R5 increased】
4、单选题：
In the schematic diagram of sound source location of operational amplifier, if the static voltage of out1 is 4V, what is the reason?
选项：
A: The resistance of R5 increased
B: The resistance of R4 decreased
C: The resistance of R3 decreased
D: E2 is short-circuited
答案: 【 E2 is short-circuited】
5、单选题：
In the schematic diagram of sound source location of operational amplifier, if the static voltage of out1 is 1V, what is the reason?
选项：
A: The resistance of R5 increased
B: R4 is open-circuited
C: The resistance of R3 decreased
D: E2 is open-circuited
答案: 【 R4 is open-circuited】
6、单选题：
In the schematic diagram of sound source location of operational amplifier, if the static voltage of out1 is 0.8V, what is the reason?
选项：
A: E4 is short-circuited
B: The resistance of R4 increased
C: The resistance of R3 decreased
D: The voltage at the top of the microphone, MIC is 5V
答案: 【 E4 is short-circuited 】
7、单选题：
In the schematic diagram of sound source location of operational amplifier, if the static voltage of out1 is 2V, what is the reason?
选项：
A: The resistance of R5 decreased
B: The resistance of R4 increased
C: The resistance of R3 decreased
D: E4 is reversed
答案: 【 E4 is reversed】
8、单选题：
In the schematic diagram of sound source location of operational amplifier, if the static voltage of out1 is 1V, what is the reason?
选项：
A: R5 is short-circuited
B: The resistance of R4 decreased
C: R3 is short-circuited
D: The voltage of E2 is 5V
答案: 【 The resistance of R4 decreased】
9、单选题：
In the schematic diagram of sound source location of operational amplifier, if the output voltage of out1 op amp is 2.5V at a certain time, what is the possible TP2 voltage?
选项：
A: 3.1V
B: 2.5V
C: 1.9V
D: 0.7V
答案: 【 1.9V】
10、单选题：
In the schematic diagram of sound source location of operational amplifier, if the output voltage of out1 op amp is 3V at a certain time, what is the possible TP2 voltage?
选项：
A: 3.6V
B: 2.3V
C: 1.9V
D: 0.7V
答案: 【 2.3V】
11、单选题：
In the schematic diagram of sound source location of operational amplifier, if circuits are required to respond to smaller sounds, what changes need to be made?
选项：
A: R3 needs to be increased
B: R2 needs to be increased
C: E2 needs to be increased
D: R4 needs to be increased
答案: 【 R3 needs to be increased】
12、单选题：
In the schematic diagram of sound source location of operational amplifier, if circuits are required to respond to smaller sounds, what changes need to be made?
选项：
A: R3 needs to be decreased
B: R2 needs to be decreased
C: E2 needs to be decreased
D: R4 needs to be decreased
答案: 【 R2 needs to be decreased】
13、单选题：
In the schematic diagram of sound source location of operational amplifier, what is the approximate voltage amplification factor of the pre-op amp in Figure 1?
选项：
A: 11
B: 10
C: -10
D: -11
答案: 【 11】
14、单选题：
In the schematic diagram of sound source location of operational amplifier, if the voltage amplification of the pre-op amp in Figure 1 is approximately 100, what changes will be required?
选项：
A: R4=100K
B: R3=100K
C: R6=10K
D: R3=47K
答案: 【 R3=100K】
15、单选题：
In the schematic diagram of sound source location of operational amplifier, if the voltage amplification of the pre-op amp in Figure 1 is approximately 50, what changes will be required?
选项：
A: R4=100K
B: R3=100K
C: R6=10K
D: :R3=47K
答案: 【 :R3=47K】
16、单选题：
In the schematic diagram of sound source location of operational amplifier, OP1B is the op amp close to the microphone. What is its working state?
选项：
A: Negative feedback state
B: Positive feedback state
C: Comparison status
D: Follower status
答案: 【 Negative feedback state】
17、单选题：
In the schematic diagram of sound source location of operational amplifier, OP1A is the op amp close to the LED. What is OP1A working state?
选项：
A: Negative feedback state
B: Positive feedback state
C: Comparison state
D: Follower status
答案: 【 Comparison state】
18、单选题：
In the schematic diagram of sound source location of operational amplifier, OP1A is the op amp close to the LED. What is its working state?
选项：
A: Negative feedback state
B: Positive feedback state
C: Opened loop state
D: Amplifier status
答案: 【 Opened loop state】
19、单选题：
In the schematic diagram of sound source location of operational amplifier, OP1B is the op amp close to the microphone. What is OP1B working state?
选项：
A: Oscillator state
B: Positive feedback state
C: Closed loop state
D: Voltage follower status
答案: 【 Closed loop state】
20、单选题：
In the schematic diagram of sound source location of operational amplifier, what is the possible consequence if R6 is short-circuited?
选项：
A: Microphone signal cannot enter op amp
B: LED will flash irregularly
C: Voltage disturbance of OUT1
D: The op amp will burn down
答案: 【 Microphone signal cannot enter op amp】
21、单选题：
In the schematic diagram of sound source location of operational amplifier, what is the possible consequence of R6 is open-circuited?
选项：
A: Microphone signal cannot enter op amp
B: LED will flash irregularly
C: Voltage of OUT1 is unstable
D: The op amp will burn down
答案: 【 Voltage of OUT1 is unstable】
22、单选题：
In the schematic diagram of sound source location of operational amplifier, what is the possible consequence if R2 is short-circuited?
选项：
A: Microphone signal cannot enter op amp
B: LED will flash irregularly
C: Voltage disturbance of OUT1
D: The op amp will burn down
答案: 【 LED will flash irregularly】
23、单选题：
In the schematic diagram of sound source location of operational amplifier, what is the possible consequence if R2 is open-circuited?
选项：
A: Microphone signal cannot enter op amp
B: LED will flash irregularly
C: Voltage of OUT1 is unstable
D: The sensitivity of the circuit will be very low
答案: 【 The sensitivity of the circuit will be very low】
24、单选题：
In the schematic diagram of sound source location of operational amplifier, if the light needs to be on for a longer time when there is sound, what changes need to be made?
选项：
A: Increase the value of R7
B: Increase the value of R3
C: Decrease the value of C3
D: Increase the value of R6
答案: 【 Increase the value of R7】
25、单选题：
In the schematic diagram of sound source location of operational amplifier, if the light needs to be on for a longer time when there is sound, what changes need to be made?
选项：
A: Increase the value of R8
B: Increase the value of R3
C: Increase the value of C3
D: Increase the value of R6
答案: 【 Increase the value of C3】
26、单选题：
In the schematic diagram of sound source location of operational amplifier, what is the possible consequence of R6 is short-circuited?
选项：
A: The whole circuit will not respond to sound.
B: The right channel (where OP1 is located) will not respond to sound
C: OUT1 Voltage disturbance
D: The op amp will burn down
答案: 【 The right channel (where OP1 is located) will not respond to sound】
Quiz on Transistor sound source
1、单选题：
In the sound source determind circuit diagram (transistor version), if D2A (under C2) connect to GND, and red LEDL1 does not light up, what is the reason?
选项：
A: Inverter 40106 is not connected to power supply
B: C2 is open-circuited
C: R7 is open-circuited
D: D2 is reversed
答案: 【 Inverter 40106 is not connected to power supply】
2、单选题：
In the sound source determind circuit diagram (transistor version), if D2A (under C2) connect to GND, and red LEDL1 does not light up, what is the reason?
选项：
A: C2 is open-circuited
B: R9 is short-circuited
C: R6 is open-circuited
D: D2 is reversed
答案: 【 R6 is open-circuited】
3、单选题：
In the sound source determind circuit diagram (transistor version), if D2A (under C2) connect to GND, and red LEDL1 does not light up, what is the reason?
选项：
A: C2 is open-circuited
B: LED is reversed or damaged
C: R7 is open-circuited
D: D2 is reversed
答案: 【 LED is reversed or damaged】
4、单选题：
In the sound source determind circuit diagram (transistor version), if D2A (under C2) connect to GND, and red LEDL1 does not light up, what is the reason?
选项：
A: C2 is open-circuited
B: R9 is open-circuited
C: R6 is short-circuited
D: D2 is reversed
答案: 【 R9 is open-circuited】
5、单选题：
In the sound source determind circuit diagram (transistor version), if D2A (under C2) connect to GND, and red LED L1 does not light up, what is the reason?
选项：
A: C2 is open-circuited
B: Inverter 40106 is damaged
C: R7 is open-circuited
D: D2 is reversed
答案: 【 Inverter 40106 is damaged】
6、单选题：
In the sound source determind circuit diagram (transistor version), what's the reason that Red LED is always on?
选项：
A: C2 is open-circuited
B: D5 is short-circuited
C: R7 is open-circuited
D: D2 is reversed
答案: 【 D5 is short-circuited】
7、单选题：
In the sound source determind circuit diagram (transistor version), what's the reason that Red LED is always on?
选项：
A: C2 is open-circuited
B: D5 is open-circuited
C: R7 is open-circuited
D: CE end of Q2 is short-circuited
答案: 【 CE end of Q2 is short-circuited】
8、单选题：
In the sound source determind circuit diagram (transistor version), what's the reason that Red LED is always on?
选项：
A: C2 is open-circuited
B: R5 is short-circuited
C: R9 is open-circuited
D: R4 is short-circuited
答案: 【 R5 is short-circuited】
9、单选题：
In the sound source determind circuit diagram (transistor version), what's the reason that Red LED is always on?
选项：
A: C2 is short-circuited
B: R5 is misused to 10K
C: R9 is open-circuited
D: R4 is short-circuited
答案: 【 R5 is misused to 10K 】
10、单选题：
In the sound source determind circuit diagram (transistor version), the voltage of D2A is 4.9V, and the LED is not on. What is the reason?
选项：
A: C2 is short-circuited
B: R5 is misused to 10K
C: R9 is open-circuited
D: R4 is short-circuited
答案: 【 C2 is short-circuited】
11、单选题：
In the sound source determind circuit diagram (transistor version), the voltage of D2A is 4.9V, and the LED is not on. What is the reason?
选项：
A: C2 is open-circuited
B: R5 is misused to 100K
C: R9 is open-circuited
D: R7 is short-circuited
答案: 【 R7 is short-circuited】
12、单选题：
In the sound source determind circuit diagram (transistor version), the voltage of D2A is 2.0V, and the LED is on all the time. What is the reason?
选项：
A: C2 is open-circuited
B: R5 is misused to 100K
C: R9 is open-circuited
D: R4 is short-circuited
答案: 【 R5 is misused to 100K 】
13、单选题：
In the sound source determind circuit diagram (transistor version), the voltage of D2A is 2.0V, and the LED is on all the time. What is the reason?
选项：
A: C2 is short-circuited
B: R4 is short-circuited
C: R9 is open-circuited
D: R5 is short-circuited
答案: 【 R5 is short-circuited】
14、单选题：
In the sound source determind circuit diagram (transistor version), the voltage of TP1(Q2C) is 0.7V, and the LED is on all the time. What is the reason?
选项：
A: C2 is short-circuited
B: R4 is short-circuited
C: R9 is open-circuited
D: R5 is short-circuited
答案: 【 R5 is short-circuited】
15、单选题：
In the sound source determind circuit diagram (transistor version), the voltage of TP1(Q2C) is 0.2V, and the LED is on all the time. What is the reason?
选项：
A: R5 is open-circuited
B: R4 is short-circuited
C: D2 is open-circuited
D: Q2CE is open-circuited
答案: 【 D2 is open-circuited】
16、单选题：
In the sound source determind circuit diagram (transistor version), the voltage of TP1(Q2C) is 0.2V, and the LED is on all the time. What is the reason?
选项：
A: R5 is open-circuited
B: R4 is short-circuited
C: D2 is open-circuited
D: Q2CE is open-circuited
答案: 【 D2 is open-circuited】
17、单选题：
In the sound source determindcircuit diagram (transistor version), what might happen when D2 is connected in reverse?
选项：
A: R5 will be damaged.
B: The LED will stay off.
C: R3 will be damaged.
D: Q2CE will be damaged.
答案: 【 The LED will stay off.】
18、单选题：
In the sound source determind circuit diagram (transistor version), Q1B is 0.1V. What is the possible reason?
选项：
A: R5 is open-circuited
B: The microphone is reversed
C: R1 is short-circuited
D: Q1CE is open-circuited
答案: 【 The microphone is reversed】
19、单选题：
In the sound source determind circuit diagram (transistor version), Q2B is 4.1V. What is the possible reason?
选项：
A: R5 is open-circuited
B: D2 is reversed
C: R1 is short-circuited
D: Q2E is not grounded
答案: 【 Q2E is not grounded】
20、单选题：
In the sound source determind circuit diagram (transistor version), if Q1b is 2.1V, what is the possible voltage of Q1E?
选项：
A: 0.9V
B: 1.4V
C: 3.0V
D: 2.1V
答案: 【 1.4V】
21、单选题：
In the sound source determind circuit diagram (transistor version), what will happen if the resistance of R7 is increased?
选项：
A: The lighting time of LED will be shortened.
B: The lighting time of LED will be extended.
C: The brightness of the LED will gradually fade to no light.
D: The LED will brighter
答案: 【 The lighting time of LED will be extended.】
22、单选题：
In the sound source determind circuit diagram (transistor version), what will happen when you double the capacitance of C2?
选项：
A: The lighting time of LED will be shortened.
B: The lighting time of LED will be extended.
C: The sensitivity of LED to receive sound will be improved.
D: The LED is getting brighter and brighter.
答案: 【 The lighting time of LED will be extended.】
23、单选题：
In the sound source determind circuit diagram (transistor version), what's the reason that ledl1 is always on?
选项：
A: R5 is open-circuited
B: R1 is misused as 1K
C: R3 is open-circuited
D: R4 is open-circuited
答案: 【 R3 is open-circuited】
24、单选题：
In the sound source determind circuit diagram (transistor version), what will happen if the D2 diode has serious leakage?
选项：
A: The LED will stay on.
B: The lighting time of LED will be shortened obviously
C: The LED will flash bright first, then slowly darken.
D: Leds will light up slowly, then dark down, then flash up again.
答案: 【 The lighting time of LED will be shortened obviously】
25、单选题：
n the sound source determind circuit diagram (transistor version), what is the function of the structure formed by the two inverters and D4 and D5?
选项：
A: It has an inverse effect, so that only the lamp close to the sound source can be on
B: It has an interlocking effect, so that only the lamp close to the sound source can be on
C: A trigger is formed so that only one light is on at the same time.
D: The trigger is formed to prolong the lighting time of LED.
答案: 【 It has an interlocking effect, so that only the lamp close to the sound source can be on】
26、单选题：
In the sound source determind circuit diagram (transistor version), what is the role of resistor R6?
选项：
A: When the interlock mechanism works, it can achieve the function of isolation
B: Impedance matching resistance
C: Reduce the voltage of the input inverter
D: Increase the potential at D2A
答案: 【 When the interlock mechanism works, it can achieve the function of isolation】
Chapter 11 Breathing LED Light with OP-AMPs, Comparators and Integrators
Quiz on breathing LED light with op-amps
1、单选题：
In this breathing LED circuit, what is the working state of OP1A?
选项：
A: Opened loop state
B: Positive feedback state
C: Negative feedback state
D: Amplifier status
答案: 【 Positive feedback state】
2、单选题：
In this breathing LED circuit, what type of resistor is R4 of OP1A?
选项：
A: Negative feedback resistance
B: Sampling resistance
C: Positive feedback resistance
D: Magnification control resistor
答案: 【 Positive feedback resistance】
3、单选题：
In this breathing LED circuit, what happens if the resistance of R2 increases?
选项：
A: The frequency of the triangular wave will increase
B: The frequency of the triangular wave will decrease
C: The amplitude of the square wave will increase
D: The amplitude of the square wave will decrease
答案: 【 The frequency of the triangular wave will decrease】
4、单选题：
In this breathing LED circuit, what happens if the resistance of R2 decreases?
选项：
A: The frequency of the triangular wave will increase
B: The frequency of the triangular wave will decrease
C: The amplitude of the square wave will increase
D: The amplitude of the square wave will decrease
答案: 【 The frequency of the triangular wave will increase】
5、单选题：
In this breathing LED circuit, what happens if the resistance of R2 decreases?
选项：
A: The amplitude of the triangular wave will increase
B: The amplitude of the triangular wave will decrease
C: The frequency of the square wave will increase
D: The frequency of the square wave will decrease
答案: 【 The frequency of the square wave will increase】
6、单选题：
In this breathing LED circuit, what happens if C1 decreases?
选项：
A: The amplitude of the triangular wave will increase
B: The amplitude of the triangular wave will decrease
C: The frequency of the square wave will increase
D: The frequency of the square wave will decrease
答案: 【 The frequency of the square wave will increase】
7、单选题：
In this breathing LED circuit, what happens if C1 increases?
选项：
A: The frequency of the triangular wave will increase
B: The frequency of the triangular wave will decrease
C: The amplitude of the square wave will increase
D: The amplitude of the square wave will decrease
答案: 【 The frequency of the triangular wave will decrease】
8、单选题：
In this breathing LED circuit, what is the appropriate value of Vref to ensure the normal operation of the breathing lamp in the case of 5V power supply?
选项：
A: 2.5V
B: 3.5V
C: 1.5V
D: 1.0V
E: 0.5V
答案: 【 2.5V】
9、单选题：
In this breathing LED circuit, what is the value of the Vref that the breathing light might not work properly in the case of 5V power supply?
选项：
A: 2.4V
B: 2.5V
C: 2.6V
D: 4.5V
E: 1.5V
F: 3.6V
答案: 【 4.5V;
1.5V;
3.6V】
10、单选题：
In this breathing LED circuit, what happens if the resistance of R3 decreases?
选项：
A: The amplitude of the triangular wave will increase
B: The amplitude of the triangular wave will decrease
C: The amplitude of the square wave will increase
D: The amplitude of the square wave will decrease
答案: 【 The amplitude of the triangular wave will decrease】
11、单选题：
In this breathing LED circuit, what happens if the resistance of R4 increases?
选项：
A: The amplitude of the triangular wave will increase
B: The amplitude of the triangular wave will decrease
C: The amplitude of the square wave will increase
D: The amplitude of the square wave will decrease
答案: 【 The amplitude of the triangular wave will decrease 】
12、单选题：
In this breathing LED circuit, what happens if R3 is replaced by a 20K resistor?
选项：
A: The amplitude of the triangular wave will increase
B: The amplitude of the triangular wave will decrease
C: The amplitude of the square wave will increase
D: The square wave will disappear
答案: 【 The square wave will disappear】
13、单选题：
In this breathing LED circuit, what happens if R4 is replaced by a 4.7K resistor?
选项：
A: The breathing LED will not work
B: The amplitude of the triangular wave will decrease
C: The amplitude of the square wave will increase
D: The amplitude of the triangular wave will increase
答案: 【 The breathing LED will not work】
14、单选题：
In this breathing LED circuit, what happens if a capacitor is connected in parallel to C1?
选项：
A: The period of the triangular wave will be longer
B: The frequency of the triangular wave will increase
C: The duty cycle of the square wave will increase
D: The duty cycle of the square wave will decrease
答案: 【 The period of the triangular wave will be longer】
15、单选题：
In this breathing LED circuit, what happens if a resistor is connected in parallel to R2?
选项：
A: The frequency of the triangular wave will increase
B: The frequency of the triangular wave will decrease
C: The amplitude of the square wave will increase
D: The amplitude of the square wave will decrease
答案: 【 The frequency of the triangular wave will increase】
16、单选题：
What changes should be made to make the breathing lamp of op amp breathe faster?
选项：
A: Increase the value of R2
B: Increase the value of R3
C: Decrease the value of R2
D: Decrease the value of R3
答案: 【 Decrease the value of R2】
17、单选题：
In this breathing LED circuit, why can square wave signal be output without input signal?
选项：
A: The function of integrator
B: The function of differentiator
C: The role of positive feedback
D: The role of negative feedback
答案: 【 The role of positive feedback】
18、单选题：
In this breathing LED circuit, what is the working state of transistor Q2?
选项：
A: Inverter mode
B: Follower mode
C: Amplifier mode
D: Negative feedback mode
答案: 【 Follower mode】
19、单选题：
In this breathing LED circuit, if VCC = 5V,and the chip is LM358, what is the maximum voltage that TP1 can output ( square wave signal )?
选项：
A: 4.5V
B: 3.5V
C: 3.3V
D: 0.5V
E: 4.8V
F: 3.6V
答案: 【 3.5V;
3.6V】
20、单选题：
In this breathing LED circuit, if VCC = 5V, and the chip is LM358, what is the lowest voltage that TP1 can output ( square wave signal )?
选项：
A: 4.5V
B: 3.5V
C: 1.0V
D: 0.5V
E: 0.45V
F: 1.2V
G: 0.1V
H: 0.15V
答案: 【 0.5V;
0.45V】
21、单选题：
In this breathing LED circuit, what is the working state of 8050 transistor Q1 in most of the time?
选项：
A: Saturation state
B: Amplification state
C: Cut-off state
D: On-off state
E: switch state
答案: 【 Amplification state】
22、单选题：
In this breathing LED circuit, what is the working state of 8550 transistor Q2 in most of the time?
选项：
A: Saturation state
B: Reverse bias state
C: Follower state
D: On-off state
E: Switch state
答案: 【 Follower state】
Chapter 12 Clap Counting Circuit Where Digital Circuit and Analog Circuit Work Together
Quiz on Clap Counting Circuit
1、单选题：
What is the maximum voltage that cd40110 can work at?
选项：
A: 15V
B: 5.5V
C: 9V
D: 5V
E: 12V
F: 6V
答案: 【 15V】
2、单选题：
If segment A and segment D of the digital tube connected to the CD40110 are wrongly connected, which number will be displayed abnormally?
选项：
A: 7
B: 1
C: 8
D: 3
E: 5
F: 4
答案: 【 7】
3、单选题：
CD40110 needs to be counted by cascade addition, that is multiple chips and the digital tube display multiple digits, so which pin of the chip needs to be output to the CPu PORT of ten figurs' CD40110?
选项：
A: 3
B: 12
C: 11
D: 10
E: 9
答案: 【 10】
4、单选题：
The CD40110 is currently in the addition count state, but the digital tube occasionally subtracts a few times. What is the most likely reason?
选项：
A: The pulse is connected to the subtraction count pin
B: Addition count pin is grounded.
C: The subtraction counting port is not connected
D: The supply voltage is not high enough
答案: 【 The subtraction counting port is not connected】
5、单选题：
The CD40110 is currently in the subtraction count state, but the digital tube occasionally adds a few times. What is the most possible reason?
选项：
A: The input pulse is connected to the CT
B: The addition count pin is not connected to a fixed level
C: The subtraction counting pin is not connected
D: The voltage is unstable
答案: 【 The addition count pin is not connected to a fixed level】
6、单选题：
CD40110 needs to be counted by cascade subtraction, that is multiple chips and the digital tube display multiple bits, so which pin of the ten bit chip needs to be output to the CPd of the lowest digit of CD40110?
选项：
A: 3
B: 12
C: 11
D: 10
E: 9
答案: 【 11】
7、单选题：
If the CD40110 displays a fixed "5" after the power on, and each pulse input does not change the digit, what may be the wrong connection?
选项：
A: Pin 5 is connected to high level
B: Pin 4 is connected to high level
C: Pin 6 is connected to low level
D: Pin 2 is connected to low level
答案: 【 Pin 4 is connected to high level】
8、单选题：
If the CD40110 displays a fixed "7" after the power on, and each pulse input does not change the digit, what may be the wrong connection?
选项：
A: Pin 5 is connected to high level
B: CT (pin 4) is connected to low level
C: LE (pin 6) is connected to high level
D: Pin 1 is connected to low level
答案: 【 LE (pin 6) is connected to high level】
9、单选题：
If the CD40110 displays a fixed "6" after the power is turned on, and each pulse input does not change, what may be the wrong connection?
选项：
A: Pin 5 is connected to high level
B: Pin 4 is connected to low level
C: Pin 6 is connected to high level
D: Pin 8 is connected to low level
答案: 【 Pin 6 is connected to high level】
10、单选题：
If the CD40110 displays a fixed "0" after the power is turned on, and each pulse input does not change, what may be the wrong connection?
选项：
A: Pin 5 is connected to high level
B: Pin 4 is connected to low level
C: Pin 16 is connected to high level
D: Pin 8 is connected to low level
答案: 【 Pin 5 is connected to high level】
11、单选题：
In the CD40110 counting circuit, the digital tube does not light up after being connected. What is the possible reason?
选项：
A: R8 is not connected
B: Pin 4 is connected to low level
C: Pin 16 is connected to high level
D: Pin 7 is connected to low level
答案: 【 R8 is not connected】
12、单选题：
In the CD40110 counting circuit, the digital tube does not light up after being connected. What is the possible reason?
选项：
A: Pin 16 is connected to high level
B: Pin 4 is connected to low level
C: The polarity of digital LED tube is wrong
D: Pin 7 is connected to low level
答案: 【 The polarity of digital LED tube is wrong】
13、单选题：
In the CD40110 counting circuit, when will the digital number change on CD40110 occur?
选项：
A: When pin 16 is connected to high level
B: When signal on pin 8 is falling edge
C: When signal on pin 9 is rising edge
D: When pin 7 is connected to low level
答案: 【 When signal on pin 9 is rising edge】
14、单选题：
In the CD40110 counting circuit, when will the digital number change on CD40110 occur?
选项：
A: When pin 1 is connected to high level
B: When signal on pin 9 is falling edge
C: When signal on pin 8 is falling edge
D: When signal on pin 7 is rising edge
答案: 【 When signal on pin 7 is rising edge】
15、单选题：
What letter did we agree to use for the decimal point on the digital LED tube?
选项：
A: e
B: d
C: g
D: h
E: k
答案: 【 h】
16、单选题：
When the number 0 is displayed on the digital tube, which segment (the agreed name) does not light up?
选项：
A: e
B: f
C: g
D: h
E: b
F: c
答案: 【 g】
17、单选题：
In the CD40110 counting circuit, when we need to light the decimal point on the digital tube, we need to connect the pin ( ) of the digital tube with +5V.
选项：
A: 2
B: 5
C: 7