GATE IN topic:sensors-industrial-instrumentation PYQs & Answers

Questions 1–10 of 53. Imported answers require independent review unless marked reviewed.

Active strain gauges are connected in a half-bridge configuration to measure strain in a cantilever element. When powered by a voltage source of 10 V, the voltage at the output of the bridge is 1 mV. If the gauge factor is 2.5, the strain in the cantilever element is ______ microstrain.

Your answerChoose one option.

160

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A glass pH electrode behaves linearly with an output change of 60 mV per unit change in pH. The measurement reference is set such that a solution of pH 6 produces an output of 60 mV. The pH of a solution that results in an output of −90 mV is _________.

Your answerChoose one option.

3.5

8.5

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Which of the following statements is/are correct for a thermocouple?

Your answerSelect all correct options. You can choose more than one.

It is based on the Seebeck Effect.

The change in resistance is measured.

The voltage difference between the two junctions is linearly proportional to the temperature difference between the junctions.

It is based on the concept of Joule Heat.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A parallel plate capacitive displacement sensor has a plate area of 2 cm

. The air gap between the plates is decreased by 0.1 mm from an initial value of 0.5 mm. The percentage change in the capacitance value is _____ %. (Assume permittivity as

)

Your answerChoose one option.

10.0

14.1

25.0

30.0

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The emitted radiant energy from a piece of metal was measured using a pyrometer. The temperature was calculated to be 1000 °C, assuming a surface emissivity of 0.8. It was later found that the true surface emissivity was 0.7. The actual temperature of the object is nearest to _____ °C.

Your answerChoose one option.

1043

958

1033

967

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A current carrying semiconductor of thickness 0.7 mm is placed in a transverse magnetic field. The measured Hall voltage is 0.9 mV and the current is 6 mA. If the Hall coefficient is

m³/C, the value of the incident magnetic field is ______ T. (rounded off to two decimal places)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

For a fiber Bragg grating-based sensor, the shift in the Bragg wavelength gives information about the value of the measured. For a Bragg wavelength of 1550 nm and effective index of 1.44, the grating period is ______ nm.

(rounded off to two decimal places)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the following measuring devices with their principle of measurement.

Measuring Device	Principle of Measurement
(P) Optical pyrometer	(I) Variation in mutual inductance
(Q) Thermocouple	(II) Change in resistance
(R) Strain gauge	(III) Wavelength of radiated energy
(S) Linear variable differential transformer	(IV) Electromotive force generated by two dissimilar metals

Your answerChoose one option.

(P) – (III), (Q) – (IV), (R) – (II), (S) – (I)

(P) – (IV), (Q) – (III), (R) – (II), (S) – (I)

(P) – (III), (Q) – (I), (R) – (IV), (S) – (II)

(P) – (II), (Q) – (IV), (R) – (I), (S) – (III)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A linear transducer is calibrated for the ranges shown in the figure. The gain of the transducer is ______ mA/°C (rounded off to two decimal places).

Diagram for Instrumentation Engineering question 21

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider the readout circuit of a piezoelectric sensor shown in the figure. When the piezoelectric sensor generates a charge

, the resulting change in voltage

is −2 V. Then the corresponding change in the voltage

is ____ V (rounded off to nearest integer). Note: Assume all components are ideal.

Diagram for Instrumentation Engineering question 29

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE IN topic:sensors-industrial-instrumentation PYQs

How to practice topic:sensors-industrial-instrumentation

Question 25

Question 26

Question 30

Question 50

Question 51

Question 63

Question 64

Question 14

Question 21

Question 29