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Instrumentation Interview Questions
Questions Answers Views Company eMail

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



Why rdt and thermocouple both give different output .and one things more, how to generate  ohm or mili volt  plz mail me



how to calculate static pressure in a pipe line,when we know the DP(differential pressure) in the line, area of the pipe? please any one tell me the relation between them..?

2 4648

how to convert MA in to measuring values..and how mwasuring values into MA ?..plz ansr.i have intervw


Basic working principle of control valves

1 1782

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?

Process Control Technologies,


If a normal magnetic type flow transmitter that can measure flow, temperature and show this parameters on field, is it possible by any means to get this (flow and temperature) parameters info. On dcs? And if yes then with HART, FO communication or any other communication system?

Process Control Technologies,

1 1563

If a flow transmitter (magnetic type FT) that can measure flow and temperature, then why in some industries people use flow transmitter and temperature transmitter in the same line 1 after another? Even after 1 single flow FT is capable of measuring flow as well as temperature.

Process Control Technologies,

1 3688

I have installed a RTD whose length is 2250mm(RTD stem length), but it's upper 200 -250mm is out of the reactor, and this upper 200mm stem is surrounded by atmospheric temp. And the lower portion i.e. 2000mm is in contact with the measuring fluid, then does the final measuring temp. Gonna change as the upper 200mm RTD stem is out of reactor?

Process Control Technologies,

1 1707

How does a single acting, spring return ball valve actually work? Does it require continuous air supply? 

Process Control Technologies,


In a ball valve which require 24v dc supply to operate, whose solenoid valve doesn't have any + or - indication, how can we make wiring connectionto solenoid valve?

Process Control Technologies,

1 3214

What is the difference between conductive lined pipe and conductive unlined pipe? Why do we see that?

Process Control Technologies,


Why does a pressure gauge installed on reactor, doesn't have any vent line below to release the pressure? Is it any kind of designing mistake or it actually does not require any vent line? And if it does not require any vent line below it then how we are gonna release the pressure built inside the pressure gauge?

Process Control Technologies,


Is it ok, to use non-contact type Radar type LT, on a tank that is half circular from the bottom side? If yes the, isn't the waves gonna bent in other directions? 

Process Control Technologies,


What is shielding effect?

Process Control Technologies,


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Un-Answered Questions { Instrumentation }

diff between neutral ,ground,phase , earthing and shielding?


How the sizing of the analog signal cable is calculate?


plz send me general of ongc


how pressurize drum calibrated ?


Explain about safety integrated level protection? . How it was differ from other protections ?


Punj lloyd is coming in our Jadavpur Universtiy campus for campus placement. Please send me some hints about the writtend exam. My email id is


what is dc moter.


Draw symbols of the following :


Why the ammonia and Nitric Acid level indicators is with millimeter ? and What is the conversion form millimeters that level indicator indicate to weight ?


why fuse block is not used for AI signal?


What is the difference between mmwc and mmwg?


few questions on RS 232,1 question on relationship of impedance and turns ratio, many questions on flowmeters


Explain the key components of control loop?


What are the type of bonnets in the control valves?


In turbine what does term CDP, NI, NH, HSSOC means.