Answer / akshay

bcz here 2 matals are couple together

Answer / shyam

Two dissimilar metal are couple together one end & other end
is open & used for temperature measurement.

Answer / agathiyan r

thermocouple:
thermo means related to temperature and couple means joint of two;here 2 dissimilar metal are coupled together to measure temperature for higher degree;

Answer / mutyalarao

akshay it is exactly correct ,

BUT i can say briefly,
1.the temperature measuring element formed of TWO DISSIMILAR METALS OF DIFFERENT ELEC PROPERTIES COPUPLED TOGETHER ,
2. MAIN PRINCIPLE/ PHENOMENA IN THIS MEASUREMENT IS CONDUCTION PROPERTIES OF METAL (acc to MATERIAL SCIENCE & THERMODYNAMICS ),
3.CHANGE IN THE ELEC PROPERTIES i.e .FLOW OF EMF THROUGH THE METAL WEN IT IS SUBJECTED TO TEMPERATURE DUE TO THE TEMP & ELEC PROPERTIES CHANGE.and diff metals hav diff elec properties.
4.so wen we join these metals , and apply temp to these metals ,they produces the differential voltage produced through them i.e . let us say metal 1 produce e1 , sim`ly metal2 produces e2 ,therefore net voltage produced is e12=e1-e2 or e2-e1
5.not all metals r suitable for thermocouples,those suitable which their elec properties changes with temp

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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =

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