Sensors and Transducers Interview Questions with Answers Part-1, Quizzes of Electronic Measurement and Instrumentation

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1) What is instrument?

It is a device for determining the value or magnitude of a quantity or variable.

2) Add 826 ± 5 to 628 ± 3.

N1 = 826 ± 5 ( = ± 0.605%)

N2 = 628 ± 3 ( = ± 0.477%)

Sum = 1,454 ± 8 (=± 0.55%)

3) Subtract 628 ± 3 from 826 ± 5.

N1 = 826 ± 5 ( = ± 0.605%) N2 = 628 ± 3 ( = ± 0.477%)

Difference = 198 ± 8 (= ± 4.04%)

4) List three sources of possible errors in instruments.

1. Gross Error
2. Systematic
3. Random errors.

5) Define Instrumental error.

These are the errors inherent in measuring instrument because of their mechanical structure.

6) Define limiting error.

Components are guaranteed to be within a certain percentage of rated value. Thus the manufacturer has to specify the deviations from the nominal value of a particular quantity.

7) Define probable error.

It is defined as r = ± 0.6745s where s is standard deviation. Probable error has been used in Experimental work to some extent in past, but standard deviation is more convenient in Statistical work.

8) Define Environmental error

These are due to conditions in the measuring device, including conditions in the area Surrounding the instrument, such as the effects of changes in temperature, humidity.

 Direct comparison method  Indirect comparison method

16) Define ODDs

The specification of limiting error is in itself uncertain because the manufacture himself is not sure about the accuracy because of the presence of random errors.

17) Classify Measurement Standards.

 International standards  Primary standards  Secondary standards  Working standards

18) Define transducer and give an example.

Transducer is a device which converts one form of energy into electrical energy. A thermocouple converts heat energy into electrical voltage.

19) Classify transducer based on application.

On the basis of transduction form used:  As primary and secondary transducers  As active and passive transducers  As analog and digital transducers  As transducers and inverse transducers

20) What is primary transducer?

Bourdon tube acting as a primary transducer senses the pressure and converts the pressure into displacement. No output is given to the input of the bourdon tube. So it is called primary transducer. Mechanical device can act as a primary transducer.