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Instrumentation Interview Questions

Hot calibrate a level transmitter (wet & dry legs)?

2002

Instrumentation Safe Guarding test. How to determine the interval time of the test. eg:Halfyearly,Every year,Every three years etc.

1089

POSSITIVE PULSE IS APPLIED TO AN INVERTER INPUT.THE TIME FROM THE LEADING EDGE OF THE INPUT TO THE LEADING EDGE OF THE OUTPUT IS 10 ns. THE TIME FROM THE TRAILING EDGE OF THE INPUT TO THE TRYLING EDGE OF THE OUTPUT IS 8 ns. WHAT ARE THE VALUES OF tPLH and tPHL?

1219

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

2176

How a oxygen sensor & analyzer work at boiler or furnace, whatâ€™s the principle & science is beyond this, How O2 sensor scene & convert signal & move toward analyzer & analyzer show reading in percent?

4246

How to convert mA into Percentage?

KNPC,

27373

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.

MNC,

1242

can i calibrate DP transmitter online (while Tx in Service) if yes ,how?

CEPC,

3960

I have a orifice installed in plant which is design for 0~100 inH2O for 0~80MMSCFD, now due to process change the maximum flow is change to 120 MMSCFD so for this new process value what will be the DP across orifice.

5559

what is positive feedback and negative feedback?

CEPC,

4017

without color coding, without nameplate, without multimeter how can you find the type of thermocouple???

4758

why r using 250 resistances

7608

Explain level troll principle & interface level measurement.

3483

What is surge and how is it prevented, what is the purpose of bypass valve across AS valve.

996

i want the equation of this question. Tranmitter range is 120 mmwc and dcs flow range is 1700 nm3/hr. if i want to change dcs range from 1700 to 2400 nm3/hr then how much dp i have to enter in transmitter

GMR,

9056

selection criteria of control valve? and selection criteria of actuator explain in brief?

3155

What are different types of control valves?

179

how many types of preheaters are in cement industry & what r they can any body explain?

836

how radio frequency level probes works with its controller ? what is its principle ? pls give me brief explanation?

1008

please tell me what is a light up procedure of Cfbc boiler and what it's axuillaries of cfbc boiler?

7661

what is the difference between attemperator and desuperheater ?

3857

what is sil (safety integrity level

1412

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

1793

What is hp & mp seperator .& what is its working principle ?

1489

how to calibrate corollaries (Mass flow meter)?

1172

please send the drdo exam paper

1530

1. what is modbus cable? 2. what kind of communication we are using for the interface of DCS, ESD and Third party cabinets? 3. What is serial communication and peer to peer communication?

1228

Hello to all....I am an Instrumentation Graduate and i am passed out in this year only.. I am unable to find the job in my core instrumentation.. so any boby tell me how to and where to search the job....please...and also tell me i there are any courses offered in the instrumentation stream so i can do it... you can send your suggestions to my mail-id i.e Ganesh20084u@gmail.com ... please..

1089

hye SAM acn u send your e mail id, so that i can solve my query through e mail?

1336

full process of gas turbin?

1012