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Answer Posted / anupam neelabh
1.J P BENTLY
2.C D JHONSON
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i need some objective type questions in instrumentation
define feed forward control loop with example and drawing?
what effects a surging can produce in the compressor
What is hp & mp seperator .& what is its working principle ?
can any one explain in which term we are flow flow is it volumetric r is it mass? and y
all questions related to instrument technician in any offshore oil and gas company.
Explain types of valves?
any body please send me the old question papers of ongc test.
why any measurement made interms of pressure is more accurate ? to be more precise most of the flow velocity is made interms of pressure and it is accurate. what is the reason behind pressure measurement being accurate ?
how many types of spped sensors n vibration sensors?their basic principle n connection?
May I have a brief note above the voltage barriers? Whats is the purpose? Please mail me if you've operational details, mail id: rajkumar.diice@gmail.com
What is PDS and PDMS ?
How to Calibrate Level Switch in field
Questions on flow meters,few questions on HART protocol,
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.
