ALLInterview.com :: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Google
   
 
Categories >> Engineering >> Instrumentation
 
 


 

 
 Civil Engineering interview questions  Civil Engineering Interview Questions (3070)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3286)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13320)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2362)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (414)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (77)
 Bio Engineering interview questions  Bio Engineering Interview Questions (17)
 Metallurgy interview questions  Metallurgy Interview Questions (79)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (163)
 Instrumentation interview questions  Instrumentation Interview Questions (2374)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (106)
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions (38)
 Marine Engineering interview questions  Marine Engineering Interview Questions (43)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (75)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1195)
Question
what is the basic working principle of I/P and Positioner in 
any control valve.
 Question Submitted By :: Instrumentation
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
I/P is basiclly working on the flapper and nozzle
principle.And the positioner is working on the Forced
balance principle.
 
Is This Answer Correct ?    96 Yes 7 No
Ramana
 
Answer
# 2
I/P Converter , converts 4-20 mA signal from controller
to .2 to 1.0 Kg/cm2 pneumatic signal.

Positioner consist of air supply port , signal input port,
out put port.When positioner get in put signal ,it compare
with stem position and output is generated and signal
boosted sufficiently to operate the valve . It uses force
balance system.
 
Is This Answer Correct ?    46 Yes 9 No
Ashok Polampalli
 
 
 
Answer
# 3
It works on force balance principle. A coil is suspended
in a magnetic field on a flexible mount. At the lower end
of the coil is a flapper valve that operates against a
precision ground nozzle to create a backpressure on the
servo diaphragm of a booster relay. The input current flows
in the coil and produces a force between the coil and the
flapper valve, which controls the servo pressure and the
output pressure.Zero adjustment of the unit is made by
turning a screw that regulates the distance between the
flapper valve and the air nozzle. Span adjustmentis made by
varying a potentiometer,which shunts input current past the
coil.
 
Is This Answer Correct ?    41 Yes 4 No
M M Chotrani
 
Answer
# 4
mA ---> Kg/Cm2 ---> % Valve Open

4 ---> 0.2 ---> 0%
8 0.4 25%
12 0.6 50%
16 0.8 75%
20 1.0 100%
 
Is This Answer Correct ?    9 Yes 2 No
Mayank Rathod
 
Answer
# 5
I/P is input (requirement of process/operator) at which
valve needs to be operated.Positioner gives output
(feedback) to control loop about actual position of valve.
Conclusively-I/P-requirement, Positioner-job done
conformation
 
Is This Answer Correct ?    21 Yes 15 No
Rk Singh
 
Answer
# 6
it's work to forced balanced
principle
 
Is This Answer Correct ?    6 Yes 2 No
Chetan Jodatti
 
Answer
# 7
I/p converter is a heart of
control valve. Positioner is
like a blood circulation.
 
Is This Answer Correct ?    2 Yes 3 No
M.suresh
 
Answer
# 8
i/p means current to penumatic converter its gives 4-20ma
and hi regulate the penumatic pressur
 
Is This Answer Correct ?    2 Yes 8 No
Rahul D Bhoir
 
Answer
# 9
I/P works on Motion Balance and Positioner works on Force
Balance priciples
 
Is This Answer Correct ?    5 Yes 16 No
Parag Pathak
 
Answer
# 10
basic working principle on frequency circuit 
Is This Answer Correct ?    4 Yes 33 No
Aziz
 

 
 
 
Other Instrumentation Interview Questions
 
  Question Asked @ Answers
 
what is written on orifice plate?   4
what are level of automation & how these are distinguished ?   3
how in the 2 - wire transmitter, 24v supply and the 4ma signal gets in the same path? Yokogawa 1
What is the main three inputs of DCS?   1
what is the difference between 2 wire and 3 wire RTD- application wise,cost effectivity?   2
WHY WE WILL USE 0-24VdC IN ELECTRONIC CIRCUITS AND INSTRUMENTATION TRANSMITTERS? Jindal 3
hydrogen purity meter calibrating and commissioning procedure can be explained?   1
What are the processes Variables?   2
hi this is noor in my work spot, i arranged THERMOCOUPLE in the place of RTD. (in FEED WATER tank). can i use T/C or not?   10
hello dear i have faced problem in drum level transmitter. the problem is when i engrize the meter meter shows 100% but the actual level 40 or something plz suggest me   6
How to carry out hot loop checking of closed loop pf temperature control valve & temperature transmitter?   2
difference b\w a transducer and a sensor   3
 
For more Instrumentation Interview Questions Click Here 
 
 
 
 
 


   
Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
   
Copyright 2013  ALLInterview.com.  All Rights Reserved.

ALLInterview.com   ::  KalAajKal.com