Instrumentation Interview Questions
Questions Answers Views Company eMail

7. What are tri-state devices and why they are essential in a bus oriented system

1 4511

What is the loop calibration? Which instrument used to loop calibration and how?

Descon, QCon,

2 3990

1)how can calibrate temperature transmitter? 2)how can calibrate flow transmitter? 3)how can calibrate level transmitter?

ccic, Emerson, JK Pharma, NIGC, Rockwell, UltraTech,

3 46882

WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?

8 13931

WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?

Exxon Mobil, Honeywell,

23 47599

WHAT IS MEANT BY PROJECT MANAGEMENT STRATEGIES IN INSTRUMENTATION?

3012

WHAT ARE MAIN DIFFERENCE BETWEEN DCS AND SCADA?

ABB, Gold Fields, Rand Water,

7 26581

What are difference between automatic and manual control system?

5 56251

WHAT IS MEANT BY SUPERVISORY CONTROL?

3 7072

EXPLAIN PROPOTIONAL INTEGRAL DERIVATIVE CONTROL ACTION?

1 4645

EXPLAIN NETWORK COMMUNICATION ON DCS?

1598

HOW FOREIGN CONTROL SYSTEM CAN BE CONNECTED WITH DCS?

1701

why we set -10 volt in vibration sensor output,why not +10 volt

GE, Honeywell, LLM,

3 4772

what is diff between the centrifugal and reciprocating

2 5165

why 4 to 20 ma ,why not 0 to 20 or 3 to 15 or anything

Honeywell, TCS, TN,

19 42683


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Un-Answered Questions { Instrumentation }

What is the difference between PLC and DDC?

1645


1.what is the effect of vapour presuure in orifice plate flow measurement 2.which is more effective 2 pressure sensors or one single differential pressure sensor in orifice plate measurement 3.how to design a v/i converter and i/v converter 4.how many type of thermocouple are there 5.how many leads are there in thermocouple measurement 6.how pressure sensors are connected in level measurement in differential pressure method 7.what is the output of capacitive pressure sensor (ac or dc),how its o/p is signal charactarized 8.what is the physical meaning of discharge coeeficient,why it is calculated,orifice plate what is its value,why it is less than 1,Q at upstream is equal to or not equal to Q at downstream of orifice plate why?what is vena contracta in orifice plate 9.why rotameter is called variable area flowmeter,it can measure flow even if area is not varying,why it is made tapered 10.design a 10 bit counter ,which counter you will prefer 11.how to remove self heating error in RTD 12.which is more sensitive pt100 or pt50 13.why thermocouple are connected in parallel 14.what is lead contact error in RTD,how to avoid 15.what is P,PI,PID,PD controller,why there is no ID controller 16.what is override,split range,sequential,ratio,feedforward,cascade controller 17.why we moved from SR to JK and then JK to master slave JK flipflop,give correct reason 18.how to measure level of a closed container which contains vapour and liquid,remember no vapour gas should be leaked,so ultrasonic and capacitive is not an option,design another method 19.how to design horse race counter including sensors and signal conditioning element 20.what is bevelling

1927


What is 3 element control system

994


What are the error values can accepted in flow transmitter calibration?could u give any formula for this?

1375


Define the difference between a stable versus an unstable controlled system and some of the tools you might use to be able to detect when this is happening and assumptions used for control system application design that could contribute to instability

1375






what is interface level and how it is calibrate?

1751


How to do gas analysers calibration in AUTO and Manually by using zero and span gas?

1906


TEMPERATURE VARIATION FOR FREQUENTLY.

1493


hye SAM acn u send your e mail id, so that i can solve my query through e mail?

1792


Why do you want to work here

1799


I want to know about DDCMIS in detail ? please explain it. Also give name of reference books in which it is explained in detail in very simple manner.

3281


send me HPCL paper

8269


Why all the drains(Gland sealing,ESV,Casing inlet etc) are directly connected to the flash tank instead of hotwell of the condensor in the power plant? My Email Id:naba02222@gmail.com

1838


What is the exact differences between HART,FOUNDATION FIELDBUS,PROFIBUS?

2989


Why is it necessary to use compensation leg to measure the liquid level in a closed or pressurized tank?

1889