[渝粤教育] Huazhong University of Science and Technology Analog Electronics Technique 参考 资料

教育

-Analog Electronics Technique-章节资料考试资料-Huazhong University of Science and Technology【】

Test questions for The Ideal Operational Amplifier

1、【单选题】The two input terminals of an operational amplifier are labeled as:

A、high and low

B、positive and negative

C、inverting and noninverting

D、differential and nondifferential

参考资料【 】

2、【单选题】For the circuit in the Figure, the output voltage vo is ( ).

A、-6V

B、-5V

C、-1V

D、-0.2V

参考资料【 】

3、【单选题】For the circuit in Figure, the current ix is ( )

A、0.6mA

B、0.5mA

C、0.2mA

D、1/12 mA

参考资料【 】

4、【单选题】For the circuit in Figure, current io is( )

A、-10 μA

B、-2.5 μA

C、10/12 μA

D、10/14 μA

参考资料【 】

5、【单选题】If vs=8 mV, in the circuit of Figure, the output voltage is( )

A、-44 mV

B、-8 mV

C、4 mV

D、7 mV

参考资料【 】

6、【单选题】The power absorbed by the 4k ohm resistor in Figure is( ).

A、9 mW

B、4 mW

C、2 mW

D、1 mW

参考资料【 】

7、【单选题】For the circuit in Figure,the output voltage v0 is( ).

A、3 V

B、-3 V

C、-1 V

D、-2 V

参考资料【 】

8、【单选题】For the circuit in Figure,the output current io is( ).

A、0.2 mA

B、-0.2 mA

C、0.1 mA

D、-0.1 mA

参考资料【 】

9、【单选题】For the circuit in Figure,the output voltage vo is( ).<img src="http://edu-image./52330AF6793DC7306B1E1CDC53C688C5.png?imageView

A、5V

B、-5V

C、3.75V

D、-3.75V

参考资料【 】

10、【单选题】For the circuit in Figure,the output voltage vo is ( )

A、5 V

B、-5 V

C、8 V

D、-8 V

参考资料【 】

11、【单选题】For the circuit in Figure,the output voltage vo is ( ).

A、5 V

B、-5 V

C、3.8 V

D、-3.8 V

参考资料【 】

12、【单选题】Assume the operational amplifiers are ideal,if the input voltage is +1V，Determine vo=( ).

A、1 V

B、-1 V

C、2 V

D、0 V

参考资料【 】

13、【单选题】Assume the operational amplifiers are ideal,Determine vo=( );

A、1 V

B、-1 V

C、2 V

D、0 V

参考资料【 】

14、【单选题】For the circuit in Figure,the output voltage vo is( )

A、150 mV

B、250 mV

C、350 mV

D、450 mV

参考资料【 】

15、【单选题】For the circuit in Figure,the output voltage vo is( )

A、3.2 V

B、-0.8 V

C、2.4 V

D、1.2 V

参考资料【 】

16、【单选题】For the circuits shown as Figure, assume the op-amps is ideal, and the maximun output voltage of all of the op-amps is ±13V, when time is t=0s, give the input voltage is a step in voltage, and the amplitude of the input is 100mV, when time is t=1s, determine the output voltage of each op-amp is( ).

A、13 V

B、-13 V

C、0 V

D、100 mV

参考资料【 】

17、【单选题】For the circuit in the Figure, the op-amps are ideal, the input resistances of the two circuits are ( )<img src="http://edu-image./32AA7704457CD8DF3B55EDC29B09C7E5.png?imageView

A、Ri1=Ri2=1k ohm

B、Ri1<Ri2

C、Ri1>Ri2

D、Ri1=Ri2=∞

参考资料【 】

18、【单选题】Assume all the Op-Amps are ideal, determine vo in terms of vi is （ ）

A、vo=-0.5(vi+5)

B、vo=0.5(vi+5)

C、vo=2(vi+5)

D、vo=-2(vi+5)

参考资料【 】

19、【单选题】Determine the voltage transfer ratio vo/vs in this op-amp circuit, where R=10k ohm.

A、-1/3

B、-2/3

C、1/3

D、2/3

参考资料【 】

20、【单选题】Assume all the Op-Amps are ideal, and when time t=0, the capacitor voltage vc=0, then when t=0, vo1=( ), vo2=( ).

A、vo1=4V,vo2=1V;

B、vo1=-4V,vo2=-1V;

C、vo1=7V, vo2=1V;

D、vo1=7V, vo2=-2V

参考资料【 】

21、【单选题】Assume all the Op-Amps are ideal, and when time t=0, the capacitor voltage vc=0, then when t=( ? )s, the output voltage vo=0.

A、1

B、1/70

C、1/35

D、2

参考资料【 】

22、【多选题】For an ideal op amp, which of the following statements are not true?

A、The differential voltage across the input terminals is zero

B、The current into the input terminals is zero.

C、The current from the output terminal is zero

D、The input resistance is zero

E、The output resistance is zero

参考资料【 】

23、【多选题】Difference amplifiers maybe used in ( ).

A、instrumentation amplifiers

B、voltage followers

C、buffers

D、summing amplifiers

E、subtracting amplifiers

参考资料【 】

24、【判断题】In the linear operational amplifiers circuit, the inverting input of the operational amplifier is virtual ground.

A、正确

B、错误

参考资料【 】

25、【判断题】The voltage gain of the voltage follower is 1, so it can be replaced by a wire.

A、正确

B、错误

参考资料【 】

26、【判断题】In the case of open-loop, the integrated operational amplifier must work in the non-linear region.

A、正确

B、错误

参考资料【 】

27、【填空题】Assume all the Op-Amps are ideal, determine vo is （ ）V.<img src="http://edu-image./7C2E2D927BB1F5CC621E31F1A527CA8F.jpg?imageView

A、

参考资料【 】

Test questions for Semiconductor Materials and Diodes Circuits

1、【单选题】At room temperature, the concentration relationship between free electrons and holes in intrinsic semiconductors is as follows （ ）

A、Undetermined

B、More free electrons

C、More holes

D、Same

参考资料【 】

2、【单选题】What are the majority carriers in n-type materials?

A、holes

B、free electrons

C、Positive ions

D、Negative ions

参考资料【 】

3、【单选题】What are the minority carriers in p-type materials?

A、holes

B、free electrons

C、Positive ions

D、Negative ions

参考资料【 】

4、【单选题】After the formation of PN junction, the relationship between diffusion current and drift current is as follows （ ）

A、More diffusion current

B、More drift current

C、Same

D、Undetermined

参考资料【 】

5、【单选题】When PN junction is reverse biased, the resistance becomes （ ）

A、smaller

B、larger

C、Unchanged

D、Undetermined

参考资料【 】

6、【单选题】When the PN junction is forward biased , the current is mainly（ ）

A、Reverse drift current

B、Forward diffusion current

C、Forward drift current

D、Reverse diffusion current

参考资料【 】

7、【单选题】For the circuit shown in Figure， when Vγ=0.7V， the diode voltage VD and the current ID are （ ）

A、VD=0.7V, ID=1mA

B、VD=0.5V, ID=1mA

C、VD=0.5V, ID=0mA

D、VD=0.7V,ID=0mA

参考资料【 】

8、【单选题】When the temperture T increases， the forward voltage of the PN junction ( )

A、Increase

B、Decrease

C、unchanged

D、uncertain

参考资料【 】

9、【单选题】The concentration of the majority carriers in the extrinsic semiconductor is mainly affected by ( ).

A、The concentration of impurity

B、The temperature

C、The crystal defect

D、The doping technology

参考资料【 】

10、【单选题】The concentration of the minority carriers in the extrinsic semiconductor is mainly affected by ( )

A、The concentration of impurity

B、The temperature

C、The crystal defect

D、The doping technology

参考资料【 】

11、【单选题】The zener diode circuit is shown as figure, if VI =10V，R =100ohm，VZ =5V，IZ(min)=5mA，IZ(max)=50mA,T、then the reisitance of RL should be ( )

A、> 111 ohm

B、< 111 ohm

C、> 111 k ohm

D、< 111 k ohm

参考资料【 】

12、【单选题】The circuit is shown as figure, and VDD = 2 V，R = 1 kohm,vs=50sin(2pi50t)mV，and Vγ=0.7V, then the quiescent current of the diode is ( ), the quiescent voltage of the output vO is ( ) , and the ac voltage amplitude of the output is ( ) .

A、2mA，2V；0.05V

B、1.3mA，1.3V；0.05V

C、2mA，2V；0.049V

D、1.3mA，1.3V；0.049V

参考资料【 】

13、【单选题】The circuit is shown as figure, the input voltages are shown in the table, the output voltage should be ( )

A、a

B、b

C、c

D、d

参考资料【 】

14、【单选题】The circuit is shown as figure,the diodes are silicon diodes, when vs = 6sinwt V, please use the case1 model (Vr=0.7V) to analysis the circuit, the output waveform should be ( ) <img src="http://edu-image./0AE209CA7D2B7F28E2B65490A78AF7B2.png?imageView<img src="http://edu-image./C0CE68334196CEBBA95F882327314AA6.png?imageView

A、a

B、b

C、c

D、d

参考资料【 】

15、【单选题】The circuit is shown as figure , if the RMS value of the ac sine signal is 220V, RL = 0.1k,we us