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Instrumentation Interview Questions
Questions Answers Views Company eMail

how we will install a positioner ?

Descon,

2 4589

what is difference b/w tube and pipe ?

BSL, Descon, Kirloskar,

6 7269

what is the difference between 2 wire and 3 wire RTD- application wise,cost effectivity?

2 5993

what is the difference between sinking and sourcing inputs and also what are there applications?

2 5414

What is cascade control in process instrumentation?

Engineers India, ITC Infotech,

4 20837

how the 2.5bar pressure able to control the 40bar steam

IBM, PAFL, Thirumalai Chemicals,

8 7183

what is AWG?

NTPC,

2 5407

difference b\w a transducer and a sensor

4 5159

Please send the all question with answer related for interview.

1 1885

What pressure results for a flow transmitter of range 0- 180t/h in the dcs and 0-301mbar in the field using square root extraction. Kindly also suggest formulae for the percentages 0,25,50,75,100?

Kentz,

1134

what is Green field /brown field exposure in chemicals /oil /petrochemicals /refineries /paints /speciality chemicals /gas /FMCG /glass industry

1 2018

on interface level transmitter model(RTG3302-EMERSON) What is threshold valve how can we select correct threshold value T1,T2,T3,T4 When interface water & hydro carbon

1271

i have 20 kw motor & my vfd drive capcity is 18 kw if possible to use 20kw motor on this vfd?

4 7224

Tell me the field calibration procedure step by step with diagram of pressure gauge, pressure switch, pressure transmitter, temperature switch, level switch, flow switch, flow transmitter.

2279

Tell me the field calibration procedure step by step with diagram of temperature transmitter, temperature indicator, flow indicator, level indicator, control valve, thermocouple, pressure indicator (digital & analogue).

1 7545


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Un-Answered Questions { Instrumentation }

Calibration of controller (pneumatic)

1099


send me HPCL paper

6436


WHY THE DEGREE OF VALVE PLUG AND VALVE SEAT IS SLIGTLY DIFFERENT I CONTROL VALVE TRIM DESIGN

1038


sir,would you please send me the Hindustan petroleum corporation limited papers(HPCL).my e-mail ID is ujjwal_sharma1983@yahoo.com

1364


HOW TO CALCULATE ACCURACY OF AN INSTRUMENT. WHICH IS COMPITABLE FOR USE.

1393






How can we use feedback signal frm rtd for monitoring and in dcs for controlling ,then which type of rtd is sutaible 2 , 3,4wire and why ?

778


what is isloted barrier how it works and what are the main purpose.how it make safe area.

1108


anybody having Qatar Petroleum questions for instrument Technician offshore ....please send me

4655


what is the difference between magnetic flow meter and mass flowmeter

510


Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72

1202


for oil & gas industries which zone is normally preferred? why? give its example?

1198


draw shematic diagram of c/v positioner(smart type)?

1240


how many type of plug are used in pneumatic control valve,name them.

3402


how we are selecting instuments by differentiating certain instruments in 4 to 20 ma range and certain in 1 to 5 v dc

1223


What is compensation for flow ? Why we use compensation ? What are the factors of different compensation ? We not use then what problems may happen ?

1047