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Instrumentation Interview Questions
Questions Answers Views Company eMail

How I identify to solonied coil which is 24v or 230v In our lab.because there is no tag.

MRPL Mangalore Refinery and Petrochemicals Limited,

1 9600

Can 2 transmitters be connected to Integral orifice meter taps? Does an integral orifice comes with 2 set of taps?

1 5683

What is the compensation of thermocouple

Samsung,

2 11853

Close loop and open loop diagram for instrumentation

Petron ltd,

1 5149

how to convert digital signal to analog signal in plc

UltraTech,

1 6753

Tyes of interface level measurement and how to use that technique for interface level measurement,

1610

why pressure 3-15psi is used as industrial standard and what is the reason

JAL International, UltraTech,

2 12250

what is the difference in Kg/cm2 and mmwc?

Niko,

2 6905

How we are blocking 40 kg or more pressure through only 6 kg instrument air in control valve 

3 7957

What is the formula of vabration sesore. i mean how to covert mils to volt plz share if any body knows   very argent : my mai is merajalam143545@yahoo.com

Samsung,

1491

How to calibrate radar lt type transmitter

NTPC,

1 5432

What is the live zero and dead zero

Samsung,

2 6270

Why rtd  out put is ohm how create the ohm 

Samsung,

1 4521

What is the difference between ff transmitter and non ff transmitter

Samsung,

1507

What is the diffrence between ff tx and non ff tx

Jindal, Rosemount,

1508


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Un-Answered Questions { Instrumentation }

Explain why use mmwc unit?

135


What is the advantage of using locally fabricated hook ups over Pre fabricated hook ups in process instrumentation?

1151


find the kp ki kd from the transper function G(S)=29.44s+04707/1.5349s2+s

979


1.what is controller proportional gain 2.what is the controller intergral action time. 3.A proportional plus derivative controller that has a proportional band of 20% and a derivative action time of 0.1 minutes. Construct the shape of the output waveform for the triangular input if the input rises and falls at the rate of 4 units per minute.

1726


What are de-saturators?

157






how to relay switch sense the fault?

1606


What types of Instrumentation Related Questions can an Interviewer ask in a Telephonic Interview ?

1580


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 ?

946


how to measure oxygen which methods are using?

1019


installation process of orifice,a question asked for confusion creation in interview by BARC 1.if orifice is tightly fitted with pipe ,it will act like venturi 2.if orifice is left hanging in between liquid it will not create the pressure difference exactly,

1163


Explain signal isolator

178


What is difference of fanuc alpha series 16i and 18i controller.also what is differnce betn TC and MC controller

1370


A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.

1243


hello can yoy pls send me previous papers of jindalpower and steel ltd.....'m from instrumentation..... mani1048@gmail.com

1137


what deference between panel earth and systemearth

1282