electrical

Electrical Instruments MCQ Objective Questions and Answers Page - 3

1.

A thermocouple arrangement is to be used to measure temperature in the range of  700-8000 C. point out the pair that would be most suitable for this application.

Answer/ Hint      

Answer : B

Explanation :

2.

For surface temperature measurement one can use

Answer/ Hint      

Answer : D

Explanation :

3.

It is required to measure temperature in the range of  13000 C to 15000 C. the most suitable thermocouple to be used as a transducer would be

Answer/ Hint      

Answer : B

Explanation :

4.

Bridge circuits using resistance temperature detectors  (RTD’s)  in temperature measurements usually employ the  “three lead system”  so as to obtain

Answer/ Hint      

Answer : C

Explanation :

5.

The incorrect statement is

Answer/ Hint      

Answer : D

Explanation :

6.

The following transducer is used for accurate and precise measurement  of temperature

Answer/ Hint      

Answer : D

Explanation :

7.

What is a differential transducer  ?

Answer/ Hint      

Answer : D

Explanation :

8.

The expansion for the acronym  LVDT, a transducer used for displacement measurement, is

Answer/ Hint      

Answer : D

Explanation :

9.

LVDT  core is made up of a

Answer/ Hint      

Answer : B

Explanation :

10.

Inductive transducers are used in differential configurations because the output is not influenced by

Answer/ Hint      

Answer : D

Explanation :

11.

LVDT  can be used for

Answer/ Hint      

Answer : C

Explanation :

12.

The principle of operation of  LVDT  is based on variation of

Answer/ Hint      

Answer : B

Explanation :

13.

LVDT  has following advantage(s)

Answer/ Hint      

Answer : D

Explanation :

14.

In an  LVDT,  the two secondary windings are connected in differential mode to obtain

Answer/ Hint      

Answer : D

Explanation :

15.

Sensitivity of  LVDT  is mainly due to

Answer/ Hint      

Answer : C

Explanation :

16.

In an  LVDT,  the output quantity

Answer/ Hint      

Answer : B

Explanation :

17.

A synchrotransmitter consists of a

Answer/ Hint      

Answer : A

Explanation :

18.

A synchro is used to

Answer/ Hint      

Answer : B

Explanation :

19.

Which of the following statements is  NOT  true ?

Answer/ Hint      

Answer : C

Explanation :

20.

The principle of operation used in capacitive transducers to measure level of liquid is change of

Answer/ Hint      

Answer : B

Explanation :

21.

Capacitive transducers have the advantages of

Answer/ Hint      

Answer : A

Explanation :

22.

The dynamic characteristic of capacitive transducers are similar to those of

Answer/ Hint      

Answer : B

Explanation :

23.

Rochelle salt is a crystalline material used in producing

Answer/ Hint      

Answer : C

Explanation :

24.

Which one of the following defines piezoresistive effect  ?

Answer/ Hint      

Answer : B

Explanation :

25.

Piezoelectric crystals produce an emf

Answer/ Hint      

Answer : A

Explanation :

26.

Which of the following transducers measures the pressure by producing emf as a function of its deformation  ?

Answer/ Hint      

Answer : D

Explanation :

27.

Piezoelectric materials owe their property to the

Answer/ Hint      

Answer : B

Explanation :

28.

The Piezoelectric crystal voltage sensitivity is defined as

Answer/ Hint      

Answer : B

Explanation :

29.

Piezoelectric crystal is generally employed for measurement of which one of the following  ?

Answer/ Hint      

Answer : C

Explanation :

30.

Which one of the following is the principal disadvantage of a Piezoelectric transducer  ?

Answer/ Hint      

Answer : B

Explanation :

31.

Piezoelectric transducers have the following advantage(s)

Answer/ Hint      

Answer : D

Explanation :

32.

Hall  effect transducers have the drawbacks of

Answer/ Hint      

Answer : D

Explanation :

33.

A hall effect transducer is generally used for the measurement of

Answer/ Hint      

Answer : B

Explanation :

34.

Hall effect device can be used to

Answer/ Hint      

Answer : A

Explanation :

35.

The measurement of Hall coefficient of a semiconductor with one type of charge carrier gives the information about

Answer/ Hint      

Answer : C

Explanation :

36.

Magnetoelastic transducers work on the principle of

Answer/ Hint      

Answer : B

Explanation :

37.

The phenomenon of magnetostriction is significant in

Answer/ Hint      

Answer : B

Explanation :

38.

Solar cell is a  ______________  transducer.

Answer/ Hint      

Answer : A

Explanation :

39.

Data acquisition system are usually of

Answer/ Hint      

Answer : B

Explanation :

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