Answer / jerry

THOMAS SEEBECK discovered that if two wires made of dissimilar metals are connected at both ends to make two junctions,when one is heated,a small amount of current would flow through the circuit .when both ends of the wires are twisted together and one end is heated,the two wires produce an open circuit voltage that is called seebeck voltage.The open circuit voltage is proportional to the amount of heat added to the junction.this principal is used to detect temperature in the Thermocouple.

Answer / naveenvermaei@gmail.com

"The phenomenon of production of emf in a thermocouple when its two junctions are at different temperature is known as seebeck effect."

*thermocouple- when two wires of different metals joined at their ends to form two junction,such an arrangement ia called a thermocouple`

Answer / k.seunath

when a length of conductor is heated at one end, electrons at that end is "pushed" towards the colder end.This is due to the characteristics of the metal itself.In order to measure this movement of electrons(potential)we cannot use the same type of conductor because the net "potential" will be zero.However if a different conductor was used (different characteristics),a difference in potential can now be measured because the amount of electrons "pushed" will be different with respect to the other conductor.This is the Seebeck effect.This gives a relationship bet. voltage and temperature which can be used to measure temperature.

dear sir we have insatlled positioner model no.sipart PS2 make Siemens at our control valves . now problem is if we want to increase the response of valve opening speedy /fast. what parameters do we change for positioner ? any idea. please guide us.

0 Answers   CPL,

---

Why upper weighing limit of electronics balance is 90% of the total weighing capacity?

0 Answers   Emcure,

---

ABB DCS (AC 800 M)redundency take howmany milliseconds to switch from master controller to slave?should be less than DCS scanning time?

2 Answers   SCS,

---

what is control valve input and out put

10 Answers   Nirma,

---

i feel sq. pipe is better than round pipe pls give comment for this. advance thanks for reply

3 Answers  

---

Name four general (not technical) criteria that would you consider important, when deciding upon a particular control valve?

1 Answers  

---

i have an interview in Qatar Petroleum. So please provide the all details abt fire & gas systems

1 Answers   Qatar Petroleums,

---

what can of fault ofently come in vibration mesurement?

0 Answers  

---

THE OUTPUT OF A CURRRENT TRANSMITTER OR A PNEUMATIC TRANSMITTER HAS A LIVE ZERO?EXPLAIN

2 Answers  

---

pls provide me syllabus and old question paper of instrumentation engineering for GET(JSPL)

0 Answers  

---

what is upstream and downstream in liquid flow?

6 Answers   Thermax,

---

what is XV and KV valves?

4 Answers  

---