The GATE Grind

GATE 2024 IN – Question 14

Sensors and Industrial Instrumentation · Temperature and analytical sensors · 1 mark · Multiple choice

Match the measuring devices to their principles.

DevicePrinciple
P. Optical pyrometerI. Variation in mutual inductance
Q. ThermocoupleII. Change in resistance
R. Strain gaugeIII. Wavelength of radiated energy
S. Linear variable differential transformerIV. Electromotive force generated by two dissimilar metals
  1. (P) − (III), (Q) − (IV), (R) − (II), (S) − (I)
  2. (P) − (IV), (Q) − (III), (R) − (II), (S) − (I)
  3. (P) − (III), (Q) − (I), (R) − (IV), (S) − (II)
  4. (P) − (II), (Q) − (IV), (R) − (I), (S) − (III)

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Correct answer: (A) (P) − (III), (Q) − (IV), (R) − (II), (S) − (I)

Explanation

Optical pyrometry uses thermal radiation (P-III); a thermocouple generates an emf from dissimilar metals (Q-IV).

Strain gauges change resistance (R-II), and an LVDT changes mutual coupling/inductance with core position (S-I).

Hence **A**.