electrical

Electrical Instruments MCQ Objective Questions and Answers Page - 5

1.

Which one of the following statements is not correct  ?

Answer/ Hint      

Answer : C

Explanation :

2.

Which one of the following pressure transducers is suitable for measurement of high pressure  ?

Answer/ Hint      

Answer : B

Explanation :

3.

Tachometers are used for only

Answer/ Hint      

Answer : A

Explanation :

4.

The generated emf of a dc tacho-generator is

Answer/ Hint      

Answer : A

Explanation :

5.

AC tachometers are often built with thin metallic drag-cup rotor to

Answer/ Hint      

Answer : C

Explanation :

6.

Transducer for measurement of rotational displacement  is

Answer/ Hint      

Answer : A

Explanation :

7.

An inductive pick-up used to measure the speed of a shaft has 120 tooth wheel. If the number of pules produced in a second is 3000, the rpm of the shaft is

Answer/ Hint      

Answer : B

Explanation :

8.

Doppler shift principle is used in the measurement of

Answer/ Hint      

Answer : C

Explanation :

9.

The accelerometer using  LVDT  has the advantage of

Answer/ Hint      

Answer : D

Explanation :

10.

The accelerometer used for measurement of vibration of large structures is

Answer/ Hint      

Answer : A

Explanation :

11.

The most common transducer for shock and vibration measurement is

Answer/ Hint      

Answer : D

Explanation :

12.

The drawbacks of radiation pyrometers are that

Answer/ Hint      

Answer : D

Explanation :

13.

In optical pyrometers temperature is measured by

Answer/ Hint      

Answer : C

Explanation :

14.

Which of the following is the best method for measurement of temperature of hot bodies radiating energy in visible spectrum  ?

Answer/ Hint      

Answer : C

Explanation :

15.

Which of the following is used to measure temperature inside a boiler furnace  ?

Answer/ Hint      

Answer : B

Explanation :

16.

Which is the most suitable thermocouple transducer for the measurement of temperature in the range of 1,000C  to  1,5000C  ?

Answer/ Hint      

Answer : B

Explanation :

17.

Which of the following thermocouple pairs has maximum sensitivity around 273 K  ?

Answer/ Hint      

Answer : A

Explanation :

18.

Optical pyrometer is generally used to measure

Answer/ Hint      

Answer : C

Explanation :

19.

A Reynold’s number of 1000 indicates

Answer/ Hint      

Answer : B

Explanation :

20.

The flow rate of electrically conducting liquid without any suspended particle cannot be measured by

Answer/ Hint      

Answer : D

Explanation :

21.

A hot-wire anemometer is a device used to measure  :

Answer/ Hint      

Answer : A

Explanation :

22.

The device used for measuring flow of air around an aeroplane is

Answer/ Hint      

Answer : C

Explanation :

23.

Which of the following flow meters is capable of giving the rate of flow as well as the total flow  ?

Answer/ Hint      

Answer : B

Explanation :

24.

The main drawbacks of ultrasonic flow-meter are

Answer/ Hint      

Answer : B

Explanation :

25.

Hydrometer is employed for determination of

Answer/ Hint      

Answer : B

Explanation :

26.

Inductive method can be used for measuring thickness of

Answer/ Hint      

Answer : D

Explanation :

27.

Which of the following transducers is most suitable for monitoring continuous variations in very fine thickness of a material  ?

Answer/ Hint      

Answer : B

Explanation :

28.

The electrical transducers used for continuous recording and control of humidity are

Answer/ Hint      

Answer : D

Explanation :

29.

Measurements of flow, thermal conductivity and liquid level using thermistros make use of

Answer/ Hint      

Answer : A

Explanation :

30.

In viscosity meters the quantity measured is

Answer/ Hint      

Answer : B

Explanation :

31.

The function of the reference electrode in a  pH  meter is to

Answer/ Hint      

Answer : A

Explanation :

32.

The method used for analysis of gases and their mixtures is called as

Answer/ Hint      

Answer : A

Explanation :

33.

The disadvantage(s) of capacitor microphones is/are

Answer/ Hint      

Answer : C

Explanation :

34.

The devices extensively used in sound measurement system are

Answer/ Hint      

Answer : D

Explanation :

35.

A linear displacement digital transducer uses

Answer/ Hint      

Answer : B

Explanation :

36.

Which if the following moving particles cannot be deflected by magnetic fields  ?

Answer/ Hint      

Answer : B

Explanation :

37.

Geiger counter has the advantages of

Answer/ Hint      

Answer : D

Explanation :

38.

Scintillation counters have the advantage(s) of

Answer/ Hint      

Answer : D

Explanation :

39.

Analog data acquisition system are used when

Answer/ Hint      

Answer : A

Explanation :

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Electrical Instruments MCQ Objective Questions and Answers Page - 5