Instrumentation Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Instrumentation Interview Questions

Questions Answers Views Company eMail

What is trim material . Why it is known as trim.

L&T, LNG,

1 6654

I saw one P&ID 6" control valve has been connected with 8" process line, and 2" valve also connected in parallel with 6" valve. why the 2" valve connected in parallel, Is there any technical reason. please clarify. With Regards-Kittu

GNFC,

5 10598

i am going to attend ongc exam this coming june for Graduate Engineer Trainee post if anybody knows the question pattern or have experience plz share it with me

ONGC,

3 11368

how many types of thermocouple cable are? give the name of each type.

Fabco,

1 6754

what should be minimum length and size of impulse line for steam flow orifice and feed water orifice? asked by sanjay parihar

Birla,

1 6801

why we use 4-20 mA for calibration of the instruments.why we cant use 0-20 mA?

5 11029

principle of automatic votage regulator

Bhel,

2139

how to test rotor &stator earth fault in turbine

Bhel,

1 12632

what happens if we are having very very high cavity and flashing in a control valve..??? is it stops working...immediately... or eroded...slowly

2 5854

what is the difference between(Flame proof/Explosion proof)& Fire proof instruments.Both are same or different & if different in which way because the transmitter which have approved ATEX flame proof enclouser but it use PTPE O ring & PTFE Head Gasket,so its (fire safe/fire proof)????????

4 22393

what is the standard of determining opening/closing time of Motor Operated Valve?

1 5280

what is a mapping in plc & dcs

Arctern, ARM Cement,

1 12762

can anyone can let me know in Eurotron Micro cal 2+ calibrator in milli amps source mode we are not able to get 20 milli amps output it only produces 1.52 milli amps out, but display shows increase in milli amps , and err6 displays, let me know how to remove the err 6.

2266

What is a PID controller and how can it to applied to our everyday life?

4 25254

If mVolts can drop by resistance of wire as compare to mA, then how thermocouple mV reaches in CCR as accurate value?

7 10426

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Un-Answered Questions { Instrumentation }

what is instrument philosophy

2263

what is the diffrence between pressure safety valve & pressure relief valve....pls

2184

For crude application in floating roof tank, how to calibrate a DP Transmitter? How is the floating roof weight considered?

5457

What are primary elements of measuring pressure?

1282

Explain PID, ON/OFF, Controls

2036

How to calibrate the flow transmitter

1609

how to relay switch sense the fault?

2609

what is orfics working in main steam line. is it increase pressure, velocity of steam flow and dicrease steam flow rate. or any other

2187

Pressure tx shows 1 mbar but we need 1000 mbar at this process condition .. how can we sort it out .

1705

which type inter lock use in petrochemical refinery,and oil & gas?

3025

what is compensation? temprature & pressure

2016

Explain the difference between mmwc and mmwg?

5669

What is the use of temperature compensation?

2008

How to calibrate displacer type level transmitter (chemtrol make )for level measurement in hotwell , LP & HP heater ?

5909

please tel me the calibration of pneumatic controler.

2151

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