2021 Electronic Instrument Practice(Dalian University of Technology) 最新满分章节测试答案
本答案对应课程为:点我自动跳转查看
本课程起止时间为:2021-10-08到2021-12-31
本篇答案更新状态:已完结
3.Multi-meter Multi-meter Quiz
1、 问题:The capacitance value of "104" is___.
选项：
A:104uF
B:10.4pF
C:10×4F
D:10×10^4 pF
答案: 【10×10^4 pF】
2、 问题:Which of the following statements about the light-emitting diode is correct？
选项：
A:The long pin is positive and the short one is negative.
B:The long pin is negative and the short one is positive.
C:Independent of pin length
D:Unable to determine
答案: 【The long pin is positive and the short one is negative.】
3、 问题:What’s the value of a resistor with color ring "purple, green, black, brown and gold"
选项：
A:7500±5%W
B:750±0.5%W
C:7.5×102±1.5%W
D:750±2%W
答案: 【7500±5%W】
4、 问题:Which of the following statements is correct？
选项：
A:When measuring AC signal, the same result can be obtained by DC measurement.
B:When measuring the AC signal, the measured value is the effective value.
C:When measuring the AC signal, the measured value is the peak value.
D:When measuring the AC signal, the measured value is the peak-peak value.
答案: 【When measuring the AC signal, the measured value is the effective value.】
5、 问题:Digital multi-meter cannot measure ( ) when the measured circuit is working.
选项：
A:voltage
B:current
C:resistance
D:None of the above
答案: 【resistance】
6、 问题:Which of the following is a disadvantage of the digital multi-meter?
选项：
A:indirect reading
B:complicated measuring methods
C:slow response
D:Poor frequency characteristics
答案: 【Poor frequency characteristics】
7、 问题:When measuring short circuit, set the selection gear to the ( ) mode.
选项：
A:resistance
B:direct voltage
C:direct current
D:buzzing mode
答案: 【buzzing mode】
8、 问题:When using a pointer multi-meter to measure resistance, what must be done at the start of the each measurement?
选项：
A:Ohm zero adjustment
B:Mechanical zero adjustment
C:Reinsert the probes into the jacks
D:Set the switch at the maximal range
答案: 【Ohm zero adjustment】
9、 问题:When using a multi-meter (especially during high voltage measurement), it is required to use the probe with one hand. The reason for this is ( ).
选项：
A:to meet the habit of most people to use their right hand to complete fine movements
B:to protect personal life
C:to measure accurately
D:the rigid system
答案: 【to protect personal life】
10、 问题:Which of the followings are the correct ways of using the ohm mode of the pointer multi-meter?
选项：
A:Select the appropriate magnification. When measuring resistance in ohmmeter, the appropriate magnification should be chosen to indicate the pointer near the median. It is best not to use the 1/3 part on the left side of the scale, which is very dense in scale.
B:Ohm zero adjustment. Before using the multi-meter, perform zeroing.
C:Note that the resistance should not be measured in a live state.
D:There should not be resistance that is in parallel connection with the measured resistance.
答案: 【Select the appropriate magnification. When measuring resistance in ohmmeter, the appropriate magnification should be chosen to indicate the pointer near the median. It is best not to use the 1/3 part on the left side of the scale, which is very dense in scale.;
Ohm zero adjustment. Before using the multi-meter, perform zeroing.;
Note that the resistance should not be measured in a live state.;
There should not be resistance that is in parallel connection with the measured resistance.】
11、 问题:Which of the followings correctly describe the precautions for using the digital multi-meter?
选项：
A:Before using the multi-meter, check whether the red and black probes are connected to the correct ports.
B:Before the multi-meter is connected to the circuit under test, check if probes and mode are right, when you are unable to estimate the voltage or current, set the multi-meter to highest range first.
C:When the multi-meter is measuring, do not touch the metal parts of the probes.
D:When the multi-meter is measuring, changing range can be directly shifted.
答案: 【Before using the multi-meter, check whether the red and black probes are connected to the correct ports.;
Before the multi-meter is connected to the circuit under test, check if probes and mode are right, when you are unable to estimate the voltage or current, set the multi-meter to highest range first.;
When the multi-meter is measuring, do not touch the metal parts of the probes.】
12、 问题:Three and a half multi-meter can display a maximum value of 1999.
选项：
A:正确
B:错误
答案: 【正确】
13、 问题:The Hold button of UT801 multi-meter is used to display the value when the parameter is unstable.
选项：
A:正确
B:错误
答案: 【正确】
14、 问题:When using the multi-meter, you can turn the selection gear randomly.
选项：
A:正确
B:错误
答案: 【错误】
15、 问题:Frequency can be measured by UT801 multi-meter.
选项：
A:正确
B:错误
答案: 【正确】
8.Waveform Generator Waveform Generator Quiz
1、 问题:What’s the attenuation ratio when you press the shift+ (-40 dB) button of the SFG-1013 Waveform Generator.
选项：
A:2 times
B:10 times
C:40 times
D:100 times
答案: 【40 times】
2、 问题:SFG-1013 Waveform Generator DUTY push-pull button can be pressed to set the DUTY cycle to ( ).
选项：
A:0
B:50%
C:the previous DUTY cycle value
D:None of the above
答案: 【50%】
3、 问题:In AM, the ( ) of the carrier changes in accord with the ( ) of the modulating waveform.
选项：
A:Frequency, Offset
B:Amplitude, Frequency
C:Amplitude, Instantaneous voltage
D:Frequency, Amplitude
答案: 【Amplitude, Instantaneous voltage】
4、 问题:The modulated waveform consists of two parts: ( )
选项：
A:The period and the amplitude
B:The carrier and the modulating
C:The offset and the frequency
D:None of the above
答案: 【The carrier and the modulating】
5、 问题:In FM, the ( ) of the carrier changes in accord with the ( ) of the modulating waveform.
选项：
A:Phase, Offset
B:Frequency, Instantaneous voltage
C:Amplitude, Frequency
D:Offset, Amplitude
答案: 【Frequency, Instantaneous voltage】
6、 问题:The analog and digital modulation types include ( ).
选项：
A:PM, FSK, ASK, PSK, Sine
B:Square, AM, FM, PM
C:FSK, ASK, PSK, DC
D:AM, FM, PM, FSK, ASK, PSK, DSB-AM
答案: 【AM, FM, PM, FSK, ASK, PSK, DSB-AM】
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