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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 3066

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


1 3267

how can calibrate vacume trasmitter by HART COMMUNICATOR ?

Bajaj, IMECO,

3 5119

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

5 33931

Can we calibrate an actuator?


5 9011

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

2 4633

why we cant transmit the dc current easily

1 3618

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

Adani, Birla, MEIL,

2 6784

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?


2 4851

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


2 4362

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 4960

how works encoder in plc


Explain the usage of the PLC system?

3 4161

Explain the difference between the types of input variables plc?

1 3489

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


2 3306

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Un-Answered Questions { Instrumentation }

Instrumentation symbols interpration, P& ID, Logic diagram analysis, Electrical drawing analysis.


There are many type of control cable like pair,core,tried, What are defination each one


why we us isolation barrier in hazardous area how it works to protect the area and please clarify its current flow.


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


why orfice is not used for main steam flow calculation


What is difference between ESD and PLC please Explain me clearly.


What is eddy current? Describe the operating principle of proximity probe.


Explain the combusion chamber


what is interlock system and why we use of this?


what is function of switch, and how is it work, explain with difination


How to check electrical health of Vibration probe?


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 =


Manipulation of dead wt. tester double piston type.


There are two chlorination tonners both are connected to two pressure swithes and the pressure switch is connected to SOV which operates the valve to changeover the tonner selection i.e if pressure one tonner goes low the other tonner should come in line if it is inautomatic selection design a circuit using relays ?


Specify ideal accuracy of flow element like orifice plate, Ventury, Annubar. Ultrasonic flow meter etc.