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Instrumentation Interview Questions
Questions Answers Views Company eMail

if we mount flow tube in arrow direction then flow comes in negative & if we mount it another direction then flow comes positive,So what will be the problem

2 3586

if tx. dp increase or decrese what happend in the reading

BSP,

1 3872

how can calibrate vacume trasmitter by HART COMMUNICATOR ?

Bajaj, IMECO,

3 5865

What's the difference between cold loop test and hot loop test?

5 38313

Can we calibrate an actuator?

Siemens,

5 10060

What is Cu-100 and Cu-1000 ? and tell me its application ?

2 5242

why we cant transmit the dc current easily

1 4072

What is the Temperature Co-officient of Resistance of PT- 1000 and PT-2000 ?

Adani, Birla, MEIL,

2 7664

Consider a control valve action,the inlet air pressure is only 6 ksc but physically how it can be operate against 100 ksc line fluid pressure?

SCS,

2 5595

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

SCS,

2 4919

A DP Endress and Hauser flow transmitter is always tripping pump at low flow. set point is 74 cubic meter/hr. Thorough impulse line flushing and zero calibration has been done, yet problem persists. What do you think is the problem and how do you rectify this fault?

5 5962

how works encoder in plc

1406

Explain the usage of the PLC system?

3 4798

Explain the difference between the types of input variables plc?

1 3864

Is an analogue only transmitter as accurate as a smart transmitter?

SCA,

2 3895


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Un-Answered Questions { Instrumentation }

where are following valves are applicable to install. can any valve be installed any line. globe valve butterfly valve boll valve gate valve

1072


field bus transmitter calibration procedure tell me

1144


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 =

1301


How to calibrate Field bus transmitter? procedure ?

1669


how do u calibrate the vacuum transmitter if it shows more reading

1416






How servomotor controls throttle valve of TURBINE?

1284


hii my name is sujith...i am preparing for HPVL GET 2010... so ,,,pls help me by send any previous questions or material to my site.....(Msujith_12@in.com) thank q

1295


Why rdt and thermocouple both give different output .and one things more, how to generate  ohm or mili volt  plz mail me merajalam143545@yahoo.com

2107


What is solenoid valve? Where it is used?

450


How to work temperature gauge?

1245


What is Positive Calibration and Negative Calibration?

1561


How many interlocks at turbine side?

1266


What is instrumentation technologists and mechanics?

414


In a gas over oil actuator, after the opening/closing of valve, how the gas is vented out? How does the hydraulic/gas circuit function?

1213


which type inter lock use in petrochemical refinery,and oil & gas?

2471