2026年知到答案 sensors and detection technology 最新知到智慧树满分章节测试答案

第一章 单元测试

1、 问题:What are the characteristics of the measurement?（ ）。
选项：
A:Descriptive
B:Selective
C:Objective
D:Relative
答案: 【
Descriptive
Selective
Objective
】

2、 问题:In a mercury thermometer as seen in this figure, which one is the sensing element?（ ）。
选项：
A:Stem
B:Bulb
C:Scale
D:Mercury in the bulb
答案: 【
Mercury in the bulb
】

3、 问题:What components are there in a complex measurement system ?（ ）。
选项：
A:Sensor
B:Signal conditioning
C:Data processing
D:Output
答案: 【
Sensor
Signal conditioning
Data processing
Output
】

4、 问题:Selectivity is a necessary but not sufficient aspect of measurement. （ ）
选项：
A:对
B:错
答案: 【
对
】

5、 问题:There are two different systems for the units of length, the metric units and the customary units?（ ）
选项：
A:对
B:错
答案: 【
对
】

6、 问题:Any physical quantity can be expressed in terms of the base units. （ ）
选项：
A:对
B:错
答案: 【
错
】

7、 问题:The additional units are independent to each other, but not independent to the base units. （ ）
选项：
A:对
B:错
答案: 【
错
】

8、 问题:In SI units, there are different kinds. They are ?（ ）。
选项：
A:Additional units
B:Base units
C:Secondly units
D:Derived units
答案: 【
Additional units
Base units
Derived units
】

9、 问题:In the follow units, who are base units ?（ ）。
选项：
A:Meter
B:Kilogram
C:Second
D:Radian
答案: 【
Meter
Kilogram
Second
】

10、 问题:In the follow units, which one is not the derived units ?（ ）。
选项：
A:Hertz
B:Watt
C:Ampere
D:Hour
答案: 【
Ampere
】

11、 问题:In SI system, there are different levers of standards, they are（ ）。
选项：
A:Primary standards
B:Secondary standards
C:Working standards
D:Reference standards
答案: 【
Primary standards
Secondary standards
Working standards
】

12、 问题:The International Prototype Meter is the primary standard of length. （ ）
选项：
A:对
B:错
答案: 【
对
】

13、 问题:All measurements of continuums involve errors. （ ）
选项：
A:对
B:错
答案: 【
对
】

14、 问题:In a measurement we get the measured value is 50mm. if the true value is 50.02mm, then what is the measurement error?（ ）。
选项：
A:50mm
B:50.02mm
C:0.02mm
D:-0.02mm
答案: 【
-0.02mm
】

15、 问题:A true value is the value that an object really exists when it is measured, and it can be obtained by measurement. （ ）
选项：
A:对
B:错
答案: 【
错
】

16、 问题:What are the characteristics of the random errors?（ ）。
选项：
A:are unpredictable.
B:may be predicted and hence eventually removed from data
C:the values are very small
D:cannot be corrected
答案: 【
are unpredictable.
the values are very small
cannot be corrected
】

17、 问题:In a length measurement, we measure the length 10 times and get the average length 1.55m, and the uncertainty of the measurement is 5cm. Then the measured length is（ ）。
选项：
A:1.60m
B:1.50m
C:(1.55±5)m
D:(1.55±0.05)m
答案: 【
(1.55±0.05)m
】

18、 问题:Which one is not the static characteristic of a transducer ? （ ）
选项：
A:Hysteresis
B:Damping
C:Sensitivity
D:Accuracy
答案: 【
Damping
】

19、 问题:In a measurement, the full scale of the transducer is 100 millivolts, and the difference between the increasing run and the decreasing run is 25 millivolts, Then what is the hysteresis of the transducer? （ ）
选项：
A:25 millivolts
B:25%
C:100 millivolts
D:0.25 millivolts
答案: 【
25%
】

20、 问题:To calibrate the deadband of a transducer by slowly increasing the input signal. If the noted input is 5μm, and the span of the transducer is 10mm. The deadband error is （ ）
选项：
A:5μm
B:5%
C:0.05%
D:0.5%
答案: 【
0.05%
】

21、 问题:In the calibration of the linearity of a transducer, the maximum difference between the measured value and the calibration curve is -0.25 volts, and the full span of the transducer is 10 volts. The linearity error is （ ）
选项：
A:-0.25 volts
B:-2.5%
C:0.25%
D:2.5%
答案: 【
-2.5%
】

22、 问题:To calibrate the sensitivity of a thermometer. When temperature is changed from 0ºC to 100ºC, the resistance changes from 100 ohm to 153.5 ohm. The sensitivity for this range is （ ）
选项：
A:53.5 ohm
B:0.535
C:53.55%
D:0.535 ohm/ºC
答案: 【
0.535 ohm/ºC
】

23、 问题:Dynamic characteristics, describes the characteristics that are determined while the system is measuring a time-varying signal. （ ）
选项：
A:对
B:错
答案: 【
对
】

24、 问题:The measurement system can be used to measure frequencies close to the corner frequency. （ ）
选项：
A:对
B:错
答案: 【
错
】

25、 问题:For a dynamic measurement system or sensor, if the damping ratio ζ is 0.77, it is （ ）
选项：
A:Underdamped
B:critically damped
C:over damped
D:others
答案: 【
Underdamped
】

第二章 单元测试

1、 问题:Sensor is a device that senses a physical stimulus and converts it into a signal, usually electrical, mechanical or optical. （ ）
选项：
A:对
B:错
答案: 【
对
】

2、 问题:In below picture, which expression is right? （ ）

选项：
A:High accuracy and low precision
B:Low accuracy and high precision
C:High accuracy and high precision
D:Low accuracy and low precision
答案: 【
Low accuracy and high precision
】

3、 问题:Displacement is defined as the difference between the initial position of something and any later position. （ ）
选项：
A:对
B:错
答案: 【
对
】

4、 问题:Possible measurement of a displacement transducer can be（ ）。
选项：
A:Thickness
B:Position
C:velocity
D:Width
答案: 【
Thickness
Position
Width
】

5、 问题:Which one is not the type of capacitive sensor（ ）。
选项：
A:Medium variation
B:Area variation
C:Spacing variation
D:Angle variation
答案: 【
Angle variation
】

6、 问题:Generally the spacing variation capacitive sensor is suitable to small displacement measurement because of the parabolic capacitance-motion relationship. （ ）
选项：
A:对
B:错
答案: 【
对
】

7、 问题:For all kinds of the area variation capacitive sensor, the relationship between the input displacement and the output capacitance is linear. （ ）
选项：
A:对
B:错
答案: 【
对
】

8、 问题:The sensitivity k of a medium-variation capacitive sensor is（ ）。
选项：
A:
B:
C:
D:
答案: 【

】

9、 问题:To measure the thickness of a steel sheet, which type of capacitive sensor can we use?（ ）。
选项：
A:Spacing variation
B:Area variation
C:Medium variation
D:Angle variation
答案: 【
Medium variation
】

10、 问题:In a mutual inductance sensor, there must be at least two coils. （ ）
选项：
A:对
B:错
答案: 【
对
】

11、 问题:In sensors, differential structure is often used be（ ）。
选项：
A:Double sensitivity
B:Better linearity
C:Lower interference
D:Faster dynamic response
答案: 【
Double sensitivity
Better linearity
Lower interference
】

12、 问题:What kind of inductive sensor is it shown in below picture?（ ）。
选项：
A:Gap-variation self-inductance sensor
B:Area variation self-inductance sensor
C:Mutual inductance sensor
D:Angle-variation inductance sensor
答案: 【
Area variation self-inductance sensor
】

13、 问题:Linear Variable Differential Transformer (LVDT) is a mutual-inductive sensor. （ ）
选项：
A:对
B:错
答案: 【
对
】

14、 问题:What are the advantages of LVDT?（ ）。
选项：
A:High linearity
B:High sensitivity
C:Big temperature range
D:High signal to noise ratio
答案: 【
High sensitivity
Big temperature range
High signal to noise ratio
】

15、 问题:About Eddy-current effect, what are right below?（ ）。
选项：
A:It is also called Skin effect.
B:It is the operation principle of Eddy Current sensors.
C:The Eddy Current is in the sensing coil.
D:The Eddy Current will create an opposing magnetic field which resists the original magnetic field.
答案: 【
It is also called Skin effect.
It is the operation principle of Eddy Current sensors.
The Eddy Current will create an opposing magnetic field which resists the original magnetic field.
】

16、 问题:To measure the thickness of a steel sheet, we should use reflective mode with low frequency of Eddy Current sensor. （ ）
选项：
A:对
B:错
答案: 【
错
】

17、 问题:What can Eddy current displacement sensors be used for? （ ）
选项：
A:Braking machanism in trains
B:Rotating speed indicators
C:Non-destructive testing
D:Thickness measurement of a steel sheet
答案: 【
Braking machanism in trains
Rotating speed indicators
Non-destructive testing
Thickness measurement of a steel sheet
】

第三章 单元测试

1、 问题: Modulation can be regarded as （ ） between message signal and carrier signal.
选项：
A:multiplying
B:combining
C:subtracting
D:Dividing
答案: 【
multiplying
】