Instrumentation Interview Questions
Questions Answers Views Company eMail

How do you measure g's?

HPCL, Thermax, GNFC, Polmon, Aramco,

5 10241

What is the meaning of the term "g force"?

Thermax, Saint Gobain, Reliance,

3 8158

What is the relationship between the universal gravitational constant (G) and the acceleration due to gravity (g)?


3 29545

Identify the electrical variable that is either directly or inferentially used by various instruments to determine the value of a measured variable.

4 4989

Describe how to calibrate various types of instruments and transmitters using ISA industrial consensus standard techniques.


4 9065

Identify and use the ANSI/ISA-S5.1 consensus industrial standard process symbols.

GAIL, Olympia,


Troubleshoot to the device level basic process control systems given the Process and Instrumentation Diagram?

HPCL, Chettinad,

2 6267

Convert a pressure, level, flow, or temperature process variable value into the appropriate pneumatic or electrical value given different types of instruments.

Jindal, MCL, Thermax,

6 13483

Determine the manipulated variable, controlled variable, and the measured variable given a description of various typical industrial processes.


6 30393

How to set up the various advanced process controllers, input the proper parameters, and tune those controllers given related control system information.

EID Parry,

1 3210

How the warning lamp of a charging-system is activated ?


Technician A says the brake warning light is connected into both the parking and service brake systems. Technician B says the brake warning light will come ON only if the service brake system fails. Who is correct?

2 3176

If a warning lamp will operate with the ground circuit is bypassed with a jumper wire to ground, what should you check?


Technician A says that a fuel tank sending unit will have a high resistance only when the tank is full. Technician B says that its resistance when the tank is full depends on whether the sending unit is designed for use with a bimetallic gauge or with a magnetic gauge. Who is correct?

3 4645

what will the sending unit in the fuel gauge utilizes?


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Un-Answered Questions { Instrumentation }

Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72


What is the start up procedure of desalter


(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.


Reason for capillary type dp level transmitter fluctuation


GWR radar transmitter working principle?


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


please send the sample qustion paper for iocl written test ..


How addressable fire systems work? Pl. send details with architect.(Loop), also send details regarding Gas system. Pl. help me.Thanks


what is stroke check for field instument transmetter's & AOV's


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


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


I am teja. I am studying Msc(tech) Electronics and Instrumentation (3years course) in Andhra university. But my course is not recognised by UGC and AICTE. Please tell me the job opportunities after this course. And i fineshed PLC course in IGIAT ,Vizag.Also complted my short term coure in SCADA, Seimans WinCC in ATI,Hyd.After Msc can i join Mtech for good job? or phd. How i can get good job in INdustrial Automation Side. Please give replay.Because this is my life matter.


if in a level tx height is given, how u calculate the ranges of the tx?


applications of plc in printing and packaging?


NPN transistor, SCR, Zener diode, LED, Varactor diode, Vortex meter, RTD, Resistor, Crystal