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Instrumentation Interview Questions
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if the neutral and ground of ups voltege are connected together in the source itslef then why the voltege b/w neutral and ground comes positive in some other destination inspite of having earth pit. how can we mimmise this?


1 1646

How vortex sensor used for steam flow measurment can be checked on line i.e without taking out from process line.



I want to know about DDCMIS in detail ? please explain it. Also give name of reference books in which it is explained in detail in very simple manner.


regarding level tx i would like to know how to select the range of the level transmitter in a closed drum(steam drum or deaerator)?

1 5568

What is the relationship between Sensor

6 7887

there is one orifice plate already installed on 3" line, but my previous engineer(who is not working here) removed that tx, but now i want to take it in to the process, so now what i have to do now? flow fluid is hytherm oil of temp. 260deg & pressure is 3bar.

2 3592

what is mapping in instrumentation and control engineering

2 4768

hi this is noor i wnt know the procedure and precations errection for PRESSURE AND DP transmitters? how to take impusle line for level and flow?(water and steam) impulse line sizes? and type of material ? plz give me answer / reffer any website ? to me ""

1 2764

What is the basic principle of vibration measurement by BENTLY NEVADA vibration measurement system? and Why it gives the -ve voltage output?

Ensol, GNFC, Reliance, Siemens,

14 124639

how the presure switches are calibrated? and what happen inside?

1 4432

Do you have reference list?


i want know about capillary type LT transmitter installation. we can install any location in between to HP and LP leg?

2 8908

how to work MIL contol valve posistioner ?



how we can calibrate split range control valve?

1 8130

how we use the positioner feed back in split range control valves?

Tata Power,

1 8512

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Un-Answered Questions { Instrumentation }

NSV type probe stands for


i have used level transmitter in starch cooking preparation tank. tank total height 2mtr.sometime LT display shows some error value when tank is fully empty and diaphragm side i already checked okay no problem in diaphragm area. field cable checked 24volt and mA shows correct value while tank empty mA is 4mA. 4mA i needed that 0% but display showing 10% or 15% percentage values are varying continously please give any good solution for me.....


How to fix back the valve actuator stem


How can i copy program (parameter) from mm440 (V.F.D.) by using BOP?


what is The specifications for oriface instalation


How to regulate the flow of Air in 4" line, with max flow of 330 nm3/hr and Pressure of 0.5 bar? please suggest the type of instrument required.


How you calibrate absolute pressure with the calibration range of 0 to 1000 0C Absolute. Please explain the procedure for calibration.


How RAL(Rotary air lock)works in cement industry?


can we replace a slot sensor (inductive type) with limit switch (potenial free contact / no-nc type).


What is the differerence between hysterisis and linearity.


please send me the inteview questions in IOCL


why we are using digital signals for I/O & how to measure this signals is getting or not ?


can anyone tell me about the basic concepts to consider before to start a PLC panel wiring


Why flow/pressure transmitter before control valve?


what is the process to make control schematic ?