Identify the electrical variable that is either directly or
inferentially used by various instruments to determine the
value of a measured variable.
Answers were Sorted based on User's Feedback
Answer / rajkumar
|Is This Answer Correct ?||10 Yes||0 No|
Answer / mithlesh
All Instruments uses 4-20 mA output signal to indicate the process variables in all mean called direct or inferential.
|Is This Answer Correct ?||1 Yes||0 No|
Answer / masters
|Is This Answer Correct ?||0 Yes||2 No|
How does milli volt is created in themocouple?
Q-Explain the different load conditions that will produced different offset which may or may not be acceptable to thhe control function
what is meant by control valve sizing?
what is the meaning of potential free contact. difference between dry and wet contact?
Why use ball valves on Gas pipelines instead of gate & or globe valves...means basic diffrence or use of these valves..how designers knows this type of valve with rating is required...
what is function of DCS , and how is it work , explain with difination
Where we r using split range and ratio controller?
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
typical loop drawing of a simple feedback control comprising of one transmitter and one control
what happen if i increase height of displacer type LT.accuracy or sensitivity are affected.why?
anybody having Qatar Petroleum questions for instrument Technician offshore ....please send me
why we use negative 24vdc to a proximeter