Instrumentation Interview Questions
Questions Answers Views Company eMail

what is the difference between E/P positioner and I/P positioner in control valve , in which application the respective positioner are used in.

ABB,

1 5642

Which is your favourite subject & explain any one topic of it.

L&T,

8953

Which topics are covered in Process Control?

Honeywell, L&T,

1613

Explain PID controller tuning & any one method used for it.

L&T, Oil India,

1 6971

Tell about your IFFCO plant visit.

L&T,

1613

Explain Three way boiler.

L&T,

2 6342

Draw bode plot of any transfer function. Why is plotting bode necessary?

L&T, STS,

1835

Explain any simple temperature control system.

HGJ, L&T,

3 7546

i want to calibrate a transmitter in the range of -100 to 300 mmwc. How it is possible to measure -100 to 300?.

Hindalco,

2 4696

what is the difference between mmhg & mmwc?. i want to calibrate a transmitter in the range of -100 to 300 mmwc. Which is the reference for calibrate the Tx,if mmwc not available?. Is it mmhg or mmho2?.

UPL,

3 45482

What are the two program execution modes of PLC?

4 7228

What are Sinking and Sourcing IO Cards

2 6322

why using negative supply for bentley nevada vibration system ?

1683

in transmiters(rose mount) how to check output 4-20ma ? and input 24v? i need exact explanation?

Adhunik,

2 6634

what is diff b/w neutron and ground?

3 5479


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Un-Answered Questions { Instrumentation }

kindly sent some demo question and answer

1527


Definition of reverse and acting controllers:

1801


tell me the field & lab calibration procedure step by step with diagram of pressure gauge, pressure switch, pressure transmitter, temperature switch, level switch, flow switch, flow transmitter, temperature transmitter, temperature indicator, flow indicator, level indicator, control valve, thermocouple, pressure indicator (digital & analogue),

1762


Sir, I want junior executive, Instrumentation question papaer for IOCL, Plz send to arabinda.ghosh83@gmail.com

1662


where uses EXe /EXd/Exo/Exn/Exp/Exq/EXia

9296






IS there any effect of vortex in low pressure side of the transmiter after the orific in feed water line? if yes then what is the calculation?

1913


3. Differentiate between ultrasonic flowmeter and radar type flow meter.

2416


what is the difference between scaler and vector drive

1645


what is the difference between profibus and controlnet networking.

2561


(1) In turbine, what does term CDP, NI, NH, HSSOC, means. (2) What is the purpose of LO overhead tank in turbines.(3) An equipment is certified for EEX, IA, IIC,T6, what do you under stand by this.(4) what is SURGE, and how it is prevented, what is the purpose of bypass valve across AS valve.(5) Give 2 application of quartz crystal used for process parameter measurement.(6) what is meant by cold float of compressor shaft. (7) state four different types of flow measurement. For gas flow measurement mmscfd is the common unit. Expand the unit and specify significance of word S in the unit.(8) what is meant by Gap voltage, in vibration measurement. Normally how much Gap voltage is set and state the reason.(9) what will the new flow factor if D/P transmitter is Re-Ranged from 25” wc to 50” wc.(10) what is the usage of QDV & Volume booster.

3417


How does work A temperature valve or fv control valve in process plz brief me

1897


How a conductivity sensor & analyzer work at boiler, whats the principle & science is beyond this,How conductivity sensor sence & convert signal & move toward analyzer & analyzer show reading in percent? also what is temperature compensate option in conductivity analyzer

2301


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

1719


What is Erosion in a control valve?

1538


Calibration of controller (pneumatic)

1496