I want to know the questions asked in ONGC interview(after being selected in the written exam) for Instrumentation branch.Kindly help.

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What are difference between automatic and manual control system?

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What is sensitivity in vibration probes..?

0 Answers   Lanco,

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What is the constant voltage unit?

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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.

0 Answers   MNC,

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what is the function of boiler in plant?

2 Answers   Maden,

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why we go for pcbs

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Why trim span ? How?

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Can anyone send most commonley asked Instrumentation questions and answers in cement industry please?

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What is the role of integral in PID controller

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Why ac supply load cell is used? Can we use the dc supply load cell?

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How is work 5/2 sov?

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