please send me the inteview questions in IOCL
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hydrogen purity meter calibrating and commissioning procedure can be explained?
How do you identify between actual alarm and false alarm in a Temperature Transmitter in SCADA based Control System
can anybody tel me how a vfd or any field instrument communicates/interface with plc/scada/cs.
What is zener diode? What is voltage regulator?
control modes
what are the on/off valve precaution?
can we replace a slot sensor (inductive type) with limit switch (potenial free contact / no-nc type).
For a diafhram 1.5 d =kn(p-p0) D4 Where d in deflection in inch k=constant n=no of capdule (P-P0)=Applied pressure in psi D In active dia at capsule. -1.5 d=k to p d being constant -1.5
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Why thermo wells are used? What materials are used in thermo wells?
Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
what is beta ratio?
NSV type probe stands for