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Instrumentation Interview Questions
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why we set -10 volt in vibration sensor output,why not +10 volt

Sabic, TVS,

3 22561

How does a strain gauge measure pressure?

2 4429

How can corrosion alter the accuracy and precision of a C- Bourdon tube pressure gauge?

1 2533

How do bending tubing provide better measurement than using tubing fittings such as elbows?


How to get Cv of control valve having following parameter ,i.e inlet pressure 4.5kg/cm2 outlet pressure 1 kg/cm2 specific gravity 0.808

3 5210

how radio frequency level probes works with its controller ? what is its principle ? pls give me brief explanation?


why generation of syncronized generator increases when frequency of grid is less then 50Hz & generation decreases when grid frequency goes up from 50 Hz, as comparision with set value entered in govering panel?

1 2785

Can anybody tell me application of PLC,DCS,SCADA.


3 7023

Hi..i am B.E. (elect.&comm.)..i m workini in a bio mass power plant as inst. Engg. I want 2 know about growth in big power plant this field is good 4 me ..i m electronics engg..? Plz plz reply..


2 4233

modbus and profibus communication difference?

1 9133

how does we calibrate a square root flow transmitter ,give an example and explain it step by step like range calculation , calibration hook up series connection , zero check , and how to apply pressure , and if not geting proportional output then what should we do ?


In control valve there are two type of valve seat we can use metal to metal seat & soft seat.On this valve seat i have following doubt. 1)I have never seen practically the internal assembly of valve so my doubt is that basically weather the seat is soft seat or metal its basic MOC is same as valve body(SS or CS) only in soft seat we are using PTFE ring & place on valve seat & in metal this PTFE ring is not threr am i correct??????? 2)what are the common general rule for using metal to metal seat & soft seat,means its depend on process parameter like liquid,gas, steam & on valve leakage class.

1 1658

In case of Transmitter's(e.g.Ultrasonic Flow meter ) we have an normal practise of selction of upstream and downstream distance such as (20D and 5D ).can anyone please let me know whow to calculate "D" ?? i guess it refers to pipe thickness is t right ?

2 3360

a flow transmitter [range-0-400mbar] connected in process line. please explain me how to calibrate the flow transmitter , & how to do static error



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Un-Answered Questions { Instrumentation }

we have a s-5 simense plc having op7 .recently on op7 showing error 1.plc not present 2. DB error frequently. can u have any solution . please send me.


Name different parts of a pressure gauge. Explain the use of hair spring in the pressure gauge.


What is Predictive Maintenance


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


Programmable Logic control.


how to calculate range of level transmitter?


Explain PID, ON/OFF, Controls


kindly sent some demo question and answer


Explain the difference between mmwc and mmwg?


pls provide me syllabus and old question paper of instrumentation engineering for GET(JSPL)


What is standard of DCS panel design?and what is step of DCS panel design?wiring and type of connector(screw or DB connector)


how u calibrate pneumatic n motorized c/v?


Im having problems with interfase betwen SPI v7.0 and SPPID v5.05. Previous versions of Intools shoul be fixed with SPPIDproj.ocx file. It was necessary to replace this file with one that allows the connection between different versions of SPPID. It is necessary in the current version to do the same?Thanks


what is moisture probe? What are there types? What is there working principle and how they works? guys this is one of technical question I had ask in interview. If you know its answer please let me know. The interviewers were more interested in microwave moisture probe, so if you find its any link please just forward me on my mail Thanks in advance.


why is not useing in boiler skin thermocople