Project ForgeInstrumentation & Process Control
Measurement Instruments
GATE 2015
Hard
Match the output signal curves (I-IV, step responses of different shapes) to measuring devices: P-Gas chromatograph with long capillary tube, Q-Venturi tube, R-Thermocouple (first order), S-Pressure transducer (second order). The correct combination is
- AP-IV, Q-III, R-II, S-I
- BP-III, Q-I, R-II, S-IV
- P-IV, Q-I, R-II, S-III
- DP-II, Q-IV, R-III, S-I
Explanation
A capillary GC has significant dead time (IV), a venturi tube responds nearly instantaneously (I), a thermocouple is classic first-order (II), and a pressure transducer with second-order dynamics can show oscillatory/overshoot response (III).
Source: GATE CH 2015 (2015)
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