The 12th Blue Bridge Cup embedded simulation questions

Objective questions

notes ：( The answer is uncertain , The answer to the question has been checked , It will be revised after the answer is announced )
1、 Usually , Which of the following options are the basic requirements for power amplifiers （BCD）.
A. UO high

B. PO high

C. Efficient

D. Waveform without distortion

2、 In order to avoid 50Hz The signal interference amplifier works , Which filter should be selected （ D）.
A. low pass filter

B. High pass filter

C. Bandpass filter

D. Band stop filter

3、 At what system clock frequencies can the main chip of the embedded competition platform run （ABC）.
A. 18MHz

B. 36MHz

C. 72MHz

D. 180MHz

4、 Which of the following communication methods can not use an independent clock signal line （BD）.
A. SPI

B. 1-Wire

C. I2C

D. UART

SPI

5、 About STM32 Micro controller SysTick The accurate description of is （B）.
A. 24 position , Add a counter

B. 24 position , Minus counter

C. 16 position , Add a counter

D. 16 position , Minus counter

6、 The output pulse frequency of quartz crystal multivibrator depends on （A）.
A. Natural frequency of crystal

B. R、C Parameters

C. Drive circuit

D. Drive voltage

7、1 individual 8 Bit D/A Conversion equipment , Full scale output voltage bit 10V, Then the device 1LSB The generated voltage increment bit （D）.
A. 100mV

B. 20mV

C. 50mV

D. 39mV
Explain :10(V)/2^8=0.0390625(V)=39mV

8、 The basis for analyzing the operational amplifier circuit is （AB）.
A. U- ≈ U+

B. I- ≈ I+ ≈ 0

C. UO = UI

D. AU = 1

9、STM32 Each of the microcontrollers DMA How many events does the channel have （B）.
A. 2

B. 3

C. 4

D. 5

10、 A single operational amplifier and several resistors , Cannot constitute （D）.
A. adder

B. Follower

C. The comparator

D. oscillator

Programming problem

Program design question answer reference ： Programming problem