Instrumentation Interview Questions
Questions Answers Views Company eMail

How do you measure g's?

HPCL, Thermax, GNFC, Polmon, Aramco,

5 10546

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

Thermax, Saint Gobain, Reliance,

3 8401

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

APPSC,

3 30154




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

4 5114

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

Reliance,

4 9306

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

GAIL, Olympia,

2248

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

HPCL, Chettinad,

2 6412

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 13689




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

Honeywell,

6 30903

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 3260

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

1390

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 3255

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

898

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 4735

what will the sending unit in the fuel gauge utilizes?

738


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Un-Answered Questions { Instrumentation }

PT RTD Range: -200 to 500 degree celsius If I configured in DCS Lower range and Upper range . In face plate it shows red colour due to overa range how was the characteristics look If the temperature is more than operating range. how was the characteristics look . whether its in Resistance vs Temperature curve is Linear or Non linear

821


what is cems analyzer explain with principle and drawing ?

895


How we can check the 2 wire proxy switch? & how it is connected to DI MODULE OF PLC?

1148


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?

813


Make a ladder diagram on LSL valve will close, on PSL valve will open and start the motor

859






WHY THE DEGREE OF VALVE PLUG AND VALVE SEAT IS SLIGTLY DIFFERENT I CONTROL VALVE TRIM DESIGN

720


what will the sending unit in the fuel gauge utilizes?

738


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?

743


How to regulate the flow of Air in 4" line, with max flow of 330 nm3/hr and Pressure of 0.5 bar? please suggest the type of instrument required.

349


What is intrinsic safety mean.

795


How vortex sensor used for steam flow measurment can be checked on line i.e without taking out from process line.

853


why we are using drum level control valve air to close?

851


What is surge and how is it prevented, what is the purpose of bypass valve across AS valve.

707


What is difference between radial vibration and axial vibration explain in detail .

131


typical loop drawing of a simple feedback control comprising of one transmitter and one control

779