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 (3079)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3290)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13338)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2363)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (416)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (77)
 Bio Engineering interview questions  Bio Engineering Interview Questions (17)
 Metallurgy interview questions  Metallurgy Interview Questions (80)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (163)
 Instrumentation interview questions  Instrumentation Interview Questions (2382)
 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 (44)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (78)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1196)
Question
how to calibrate a control valve?
 Question Submitted By :: Instrumentation
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
calibration instrument required.
1.portable pneumatic calibrator
INPUT signal OUTPUT
Generate 0.2 kg/cm 0% of v/v travel
0.4 25%
0.6 50%

0.8 75%
1.0 100%

If you observe any deviation adjust accordingly.
 
Is This Answer Correct ?    88 Yes 14 No
K.thirunathan
 
Answer
# 2
BY using DRUG calibrater we can easily calibrate just we
need a air line having pressure of 6kg as input of CV.
by giving 4-20mA signal through DRUG.
for example
4mA CV in close position
8mA 25%
12mA 50%
16mA 75%
20mA 100%
 
Is This Answer Correct ?    63 Yes 12 No
Deba
 
 
 
Answer
# 3
To calibrate a valve first check the input signal range if
it is 0.2 to 1.0 Kg/cm2 or different.
Calculate the span ( Difference between higher limit to
lower limit=1.0-0.2=.8 ) Now divide it in four equal parts
that is 0.2 Kg/cm2 this is 25% of the span.
Now check the valve travel like 2 inches, 3 inches or any
other value Divide it in four equal parts 25% of the travel.
Apply 25% of the span value+ 0.2= 0.4 Kg/cm2 it is 25% of
travel and apply full span value and see you get the
complete travel if you find difference adjust the spring
accordingly.
 
Is This Answer Correct ?    56 Yes 7 No
Azmat
 
Answer
# 4
before do the stroke checking we have make sure the bench
calibration after that we should check 0-100% stroke
 
Is This Answer Correct ?    59 Yes 14 No
Venkat
 
Answer
# 5
If the valve is SMART now we can use a HART communicator to calibrate the control valve.Give the supply pressure according to the valve name plate then use HART communicator and give 0% 25% 50% 75% & 100% check the travelling of valve 
Is This Answer Correct ?    27 Yes 8 No
Jayesh
 
Answer
# 6
first you have to now your limits if its pneumatic work
from 20 to 100kpa if current i 4 to 20ma
supply pressure,
1.bench set
2.beam alignments
3.calibration
 
Is This Answer Correct ?    13 Yes 4 No
C.grema@yahoo.com
 

 
 
 
Other Instrumentation Interview Questions
 
  Question Asked @ Answers
 
how the 2.5bar pressure able to control the 40bar steam Thirumalai-Chemicals 7
What is the basic principle of vibration measurement by BENTLY NEVADA vibration measurement system? and Why it gives the -ve voltage output? GNFC 13
what is the input to be given digital temp controller during the the calibration time?   2
what do u mean by compensating?in power plant where are compensating done?how level , flow compensated? TATA 1
in any transimitter (flow/level) there are three terminals for supply& test (+,-,+)in two wire,24VDC given to Tx.,but how 4-20 ma signal travels thru same wire (as it is for 24VDC input supply)? UltraTech 1
units of pressure,flow, level,temperature? principle of pressure gauge? calibration of pressure tx., level tx., temperature tx.flow tx.? description of two wire ,three wire and four wire R.T.D.? WHAT IS INPUT AND OUTPUT OF TX.? WHAT IS INPUT AND OUTPUT OF R.T.D. AND THERMOCOUPLE? WHAT IS HOT LOOP AND COLD LOOP? WHAT IS INPUT AND OUT PUT AND OUTPUT OF D.C.S. AND P.L.C.? PRINCIPLE AND WORKING OF HART? WHAT IS PNP AND NPN PROXY? CALIBRATION OF PRESSURE ,LEVEL ,FLOW SWITCH? DESCRIPTION OF FIELDBUS FOUNDATION? WORKING OF SOV.?   2
What is meant by calibration   5
What is transducer IFFCO 4
1)What is the suitable MOC for flow meters working at temperature between 200 - 250 cen. 2)In which application the mass flow meters are not advisable 3)Is it advisable to use radiation type or radar type instrument for non contact application   1
1.what is the role of proportional comtroller in pid controller?2.How do u calibrate the control valve? IOCL 3
Please explain the difference between instrument range and calibration range in terms of pressure transmitter? line design pressure: 93 bar operating pressure : 82 bar press Transmitter Range? calibration range ? l&T 1
Regarding MOS (maintenance override switch), I want to know its function and its state ( 1 or 0 when not activated ). An example will be very helpful..thank you.   1
 
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