List of top Sensors and Industrial Instrumentation Questions asked in GATE IN

The emitted radiant energy from a piece of metal was measured using a pyrometer. The temperature was calculated to be \(1000^{\circ}\text{C}\), 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 ______ \(^{\circ}\text{C}\).

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.

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

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 ______.