Instrumentation Interview Questions
Questions Answers Views Company eMail

what is cold loop? difference between hot and cold loop?

Adani Power,

1718

what is the use of impulse line in AFBC boiler , WHY WE CONNECT IMPULSE LINE TO TRANSMITTER , DRFT GAUGE ETC ????????

Jindal, Reliance,

6 13555

What are the most frequent problem faces with Vortex flow meter?

1 3082

Control valve Flow characteristic. How the equal percentege curve form?

5 8965

what is instrument philosophy

United Automation,

1719

what is the difference between sensor and tranducers?

12 15171

how to calibrate any tansmiter by loop or hart calibrator

2 5228

WHAT IS THE DIFFERENCE B/W PLC and DCS

Bhel,

10 12291

What is a PID?

6 8038

Explain how thw analog to digital converter works with the circuit diagram

2159

what is three element loop

7 17624

Why the industry's standard current standards are from 4mA to 20mA,not from 0mA or any other range?

3 6520

We are using Rosemount 5400 series Radar Level Transmitters in all types of Sump Applications having oily water hdrocarbon petrochemical nature. What we are facing the problem frequently is that always getting reading frezzed at some value. If we do power recycling , sometimes it is working . then making same freezing problem. If anybody faced before such type of problem and also having solution , Please give the answer.

Sabic,

1735

why pneumatic control signal output is use 0.2 to 1 kg/cm2

Jindal,

3 8182

Why we use mmwc unit for pressure

3 7560


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Un-Answered Questions { Instrumentation }

What are different types of valves?

657


what is the different between deflection type measurement and null type measurement in RTD?

1427


What is instrumentation technologists and mechanics?

551


what is IEC code in cables & how to selecting cables?

1274


How to calibrate H2s Dectector

1175






Do you have reference list?

1398


What is heating effect?

1852


how works encoder in plc

1568


how can be calibrate flow indication transmitter (rosemount) it shows excess milli amps nearly about 24 ma on full scale, but its scale was set on 20ma on full scale..???how can be simiulate..???

1981


Why use ball valves on Gas pipelines instead of gate & or globe valves...means basic diffrence or use of these valves..how designers knows this type of valve with rating is required...

1808


we are having yokogawa centum cs3000 dcs in our power plant. i need some of the operator guides NOT to appear in HIS0163 AND HIS 0162 but it shoul appear in HIS0164 HOW TO DO IT?

2091


Describe how to use megger to measure the earth resistance and insulation resistance

1675


I am having a Phoenix digital to modbus converter. The o/p of the same is connected to flow computer FB407. But the digital signals are updated only after one minute in the flow computer. what may be the cause of delay in communication? Flow computer is having a scanning period of less than 1 sec.

1442


TEMPERATURE VARIATION FOR FREQUENTLY.

1493


The company where I am working, their is rosemount 5400 series radar type level transmitter, it is meant to show level of filled tank, but along with the level it is showing temperature also, so my question is how a onon-contact type radar type level transmitter can show temperature even if it does not have any contact with the fluid?

1819