electrical

Electrical Instruments MCQ Objective Questions and Answers Page - 2

1.

High value pot resistance leads to

Answer/ Hint      

Answer : B

Explanation :

2.

Which one of the following statements for a potentiometric transducer is correct  ?

Answer/ Hint      

Answer : A

Explanation :

3.

How can resolution of a wire wound potentiometer be improved  ?

Answer/ Hint      

Answer : C

Explanation :

4.

What is the number of turns of wire needed to provide a potentiometer with a resolution of  0.05 per cent  ?

Answer/ Hint      

Answer : B

Explanation :

5.

A 3-turn 100 kΩ potentiometer with  1%  linearity uses  30 V supply. What is the potentiometer constant  ?

Answer/ Hint      

Answer : A

Explanation :

6.

A stain gauge is passive transducer and is employed for converting

Answer/ Hint      

Answer : A

Explanation :

7.

The sensitivity factor of strain gauge is normally of the order of

Answer/ Hint      

Answer : B

Explanation :

8.

The resistance of  125 Ω strain gauge changes by  1 Ω for  4000 micro-strain. The gauge factor for strain gauge is

Answer/ Hint      

Answer : B

Explanation :

9.

In wire wound strain gauges, the change in resistance under strained condition is mainly on account of

Answer/ Hint      

Answer : C

Explanation :

10.

Unbonded strain gauges are

Answer/ Hint      

Answer : B

Explanation :

11.

Bonded strain gauges are

Answer/ Hint      

Answer : C

Explanation :

12.

Over wire strain gauges foil strain gauges have the advantages of

Answer/ Hint      

Answer : D

Explanation :

13.

In a semiconductor strain gauge, the change in resistance on application of strain is mainly due to change in

Answer/ Hint      

Answer : C

Explanation :

14.

Which of the following is not an advantage of semiconductor gauges as compared to conventional strain gauges.

Answer/ Hint      

Answer : B

Explanation :

15.

In semiconductor strain gauges, what happens when a tensile strain is applied  ?

Answer/ Hint      

Answer : B

Explanation :

16.

The drawbacks of strain gauges are

Answer/ Hint      

Answer : D

Explanation :

17.

Strain gauges are constructed with Germanium chips because Germanium

Answer/ Hint      

Answer : C

Explanation :

18.

In a semiconductor strain gauge, the change in resistance on application of strain is

Answer/ Hint      

Answer : A

Explanation :

19.

Measurement of pressure can be done by using wire, foil or semiconductor type strain gauges. The disadvantage of the semiconductor type of strain gauge compared to the other two is in terms of

Answer/ Hint      

Answer : C

Explanation :

20.

The wire material of strain gauges should have

Answer/ Hint      

Answer : D

Explanation :

21.

The carrier material employed with strain gauges at room temperature is

Answer/ Hint      

Answer : A

Explanation :

22.

A rosette gauge is used to determine

Answer/ Hint      

Answer : C

Explanation :

23.

Rosette gauges are employed for measuring

Answer/ Hint      

Answer : C

Explanation :

24.

Platinum is the commonly used metal for resistance-temperature detectors (RTDs) because

Answer/ Hint      

Answer : D

Explanation :

25.

Resistance thermometer elements made from semiconductor compounds are called

Answer/ Hint      

Answer : C

Explanation :

26.

Semiconductor thermometers have the disadvantage that these

Answer/ Hint      

Answer : B

Explanation :

27.

A semiconductor device made out of a material having very high temperature coefficient of resistance is

Answer/ Hint      

Answer : D

Explanation :

28.

The temperature coefficient of resistance for a thermistor is

Answer/ Hint      

Answer : C

Explanation :

29.

For which one of the following measurements a thermistor can be used  ?

Answer/ Hint      

Answer : D

Explanation :

30.

Which one of the following is the most sensitive device  ?

Answer/ Hint      

Answer : C

Explanation :

31.

Which of the following should be incorporated in the  RTD  to make a temperature sensing bridge most sensitive to temperature  ?

Answer/ Hint      

Answer : C

Explanation :

32.

A fixed resistor of suitable value is usually connected across a thermistor to

Answer/ Hint      

Answer : D

Explanation :

33.

Three phenomena which govern the behaviour of a thermocouple are

Answer/ Hint      

Answer : D

Explanation :

34.

Cold junction in a thermocouple is

Answer/ Hint      

Answer : A

Explanation :

35.

Thermocouples

Answer/ Hint      

Answer : D

Explanation :

36.

The drawbacks of thermocouples are that

Answer/ Hint      

Answer : D

Explanation :

37.

For a thermocouple pair  (A, B)  the extension wires  (C, D)

Answer/ Hint      

Answer : A

Explanation :

38.

Which one of the following thermocouple has the highest temperature measuring range  ?

Answer/ Hint      

Answer : C

Explanation :

39.

DC tachometer generators are sometimes preferred over ac tachometer generators because

Answer/ Hint      

Answer : C

Explanation :

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