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L&T Instrumentation Interview Questions
Questions Answers Views Company eMail

Explain PID controller tuning & any one method used for it.

 1 7002

Tell about your IFFCO plant visit.

 1644

Explain Three way boiler.

 2 6389

Draw bode plot of any transfer function. Why is plotting bode necessary?

 1869

Explain any simple temperature control system.

 3 7623

diff between neutral ,ground,phase , earthing and shielding?

 1870

how to derive kg/cm2 to mmwc? complete derivation.

 11 38029

for commissioning the DPT and Flow Transmitter , what kind of necessary activities we have to check and do? specially that orifice flange valve[ isolation valve}

 1 7893

a flow transmitter [range-0-400mbar] connected in process line. please explain me how to calibrate the flow transmitter , & how to do static error

 1846

In E&I diagram what is the meaning of rectangular box and circular box

 3 9310

In RTU Panel we are having several Analogue & Digital Inputs /Outputs. We are recently facing some problems over Analog inputs , which are not updating properly (But Digital Input are updating normally) Can any one tell me from where the problem is creating , we have checked PLC CPU card, Analog Input card & we reconfigured ,But still the issue is there. Issue : 1. Sometimes Analog values are updating & sometimes not. 2. Analog values are not updating normally , showing some wrong Values 3. Total dead (0 value) Analog values are Level & flow measurement from the field instruments. (But in field the instruments are working normally & Displaying the values normally in local display unit) This problem we are facing in our Water Plant. If any one experienced this same problem or having any ideas related to our issue PLS send your valuable Answers/Replies...

 6 7104

how to replace the smart transmitter software

 1 3024

Why the Air Tank Accumulators required for the single acting actuators SDV's or BDV's as I see in some Schematic diagrams of ROTORK ??

 2 9695

How to control flow variations in magnetic flow maters..... When i will provide proper earthing?

 1797

For a diafhram 1.5 d =kn(p-p0) D4 Where d in deflection in inch k=constant n=no of capdule (P-P0)=Applied pressure in psi D In active dia at capsule. -1.5 d=k to p d being constant -1.5

 2016

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L&T Instrumentation Interview Questions


Un-Answered Questions

What is the Banking Ombudsman Scheme?

650

Can we close statement before resultset?

153

For searches. Which one is most preferred: array list or linked list?

545

Are string objects mutable or immutable?

526

What is a modular application? What does module-relative mean?

541




• What are the types of cash flows?

1716

How is a queue works?

540

What is the correct way to check if a Compass sensor is present on the system? Explain your answer.

1708

Is c sharp and c# are same?

507

wheather the size of windings in motor and generator are the same

1507

How many ways to use colors apply on html elements?

442

What is rct?

751

How to Set Up a C++ Builder or Delphi Form to View InterBase Data?

1261

What is akka in scala?

1

In HVDC LINE RECTIFIER CONTROL ON CONSTANT CURRENT AND INVERTER CONTROL CONSTANT EXITATION ANGLE CONTROL BUT HOW INVERTER CONTROL CONSTANT CURRENT?

1516