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Instrumentation Interview Questions
Questions Answers Views Company eMail

how to commission furnace ( water heater)

Petrofac,

983

Full form of KKS when use DCS.

1982

how to measure the output of RTD given the general formula of  rtd.  

2 3627

How to calculate the flow rate in Vortex flow meter?What is K factor?Can you give me an example calculation to understand the same as better?

npcc, Zadco,

1 2528

What is the potential contact / output??

Vasava Engineering Private Limited,

1 1547

How to convert 0-2500mmH2o into kg/hr? Or how to convert mmH2O into kg/hr,t/hr etc

2 17162

How many interlocks at turbine? Plz explain briefly

MRPL Mangalore Refinery and Petrochemicals Limited,

1016

In dcs contol valve parameters showing like this Gain=1 or 2 , ti=7 sec, td=20sec. But temp,pressure,level control valves we are using in which type parameter side using ti,td clearly tell me

1 2749

In field side transmitter voltage droping here no loose connection then what will happen?

Edac,

2 2946

how eddy current loss in probe and induced gap voltage accros probe trip and shaft

Reliance,

1 2705

how to adjust relay in smart positioner ?

SipChem,

1 2449

HOW TO CALCULATE ACCURACY OF AN INSTRUMENT. WHICH IS COMPITABLE FOR USE.

ABB, NTPC,

1362

How to do manual mapping in radar type level transmitter?

2 7288

What is first echo & echo window in radar type level transmitter?

843

What is frequency factor in massflow meter? When using frequency output?

PCMIL,

868


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Un-Answered Questions { Instrumentation }

Calibration procedure for water rotameters

1292


i need some objective type questions in instrumentation

4010


dear friends, i have seen flow as the selection critriea in presure guage (bourdon tube) and i would like to know what is the relation between flow and performance of pressure guage other parameters i found in the data sheet are pressure max. 1ksc temperature max. - 50 deg c line size - 80NB operating range - 1ksc pr. guage range - 0-2 ksc thank u,

1185


Drum level tx with GP4 with zero elevation:7300mmh20 on HP and 8050mmh2o on LP as range but on commissioning the tx readiing is max,Why this reading?

1022


all types instrumentation questions want

1213






What is furnace draft control?

172


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 =

1016


Draw block digram for well head from well to shipping pump?

1309


How to calibration a control valve?

180


What is difference between differential pressure & delta pressure?

159


Tell about your IFFCO plant visit.

1171


what is installation and commissioning of (fat & sat) of power plant dcs ? this question keeps in desirable conditions of one company .

3932


What is the use of single seated valve?

165


how to calculate orifice sizing? and tell me if pipe size bet 50mm t0 200mm then we can use pipe flange??? and above 250mm pipe size should i use D & D/2 Flange? is it right or wrong?

1041


Make Heater Process Logic.

1201