Process Control and Instrumentation

Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic ?…

A non-linear chemical system is exemplified by a/an_________________? A. Isothermal CSTR B. MixerC. Non-isothermal CSTR D. None of these

All the thermocouples used for temperature measurement use dissimilar metal ________________? A. Strips B. BarsC. Wires D. Beads

Dead zone is the__________________? A. Same as time constant B. Same as transportation lagC. Maximum change in the variable that does not change the reading of the instrument D. None of these

The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is________________? A. 5π/12 B. π/6 C. π/12 D. π/3…

The transfer function for a P-D controller is________________? A. Kc(1+ηD s) B. Kc(1 +1/ηD s) C. Kc ηD s D. Kc/ηD s

Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the…

The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K (s + 1)/ will have a definite number of loci for variation of K from 0 to ∞. The number of loci…

Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability ? A. Mercury in glass thermometerB. Alcohol in glass thermometer C. Fused metal (Na or K) in steel thermometer…

Working principle of mercury in glass thermometer is__________________? A. Volumetric expansion B. Pressure rise with temperature C. Linear expansion D. None of these