Answer Posted / ecxlsync

in boiler drum level control it uses the three elements
principle wherein it consist of Feed water Flow, actual drum
level and steam flow.
in the feed water line there are two Flow Control Valves (37%and 100%). the 37% is being controlled by single element
(single controller). the SP of single controller is the
actual pressure compensated drum level. if the steam flow
is more than 30% of its designed max flow, drum level
control will shift automatically to three elements control
which is in cascaded mode (two controllers). the output of
primary controller which is compensated by the steam flow
as feed forward control is being fed to the secondary
controller as setpoint for the feed water flow. the output
of secondary controller is sent to 100% FCV to manipulate
the feed water flow.
therefore, 3 elements control is to attain that feed water
flow will be equal to the Steam flow.

principle of dead weight tester ?

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plz you help about Que paper of mahagenco previous your,any model paper relad to it{maharastra power genration}

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please any body have most important data for study for saudi aramco test of instrument QC thanks email shahnaveedullah@gmail.com

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i hav applied for the post of engg. in iocl so please require the past test papers fro instrumentation engg please please help me and send me the papers or tell me the pattern and type of ques asked in examination......

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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.

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use of split range ? where it is used ? in which control loop it is used ?

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any body who gone thru recent iocl interview.INSTRUMENTATION questions. I need.

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I am manjunath having exp in maintenance of chemical plants,know i want to do a design course INTOOLS,after doing design course can we get jobs in design field.sinve i dont have design exp..

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hi i am eswar i want to know the instrumentation interview questations for eil(engineers india ltd) i have applied for engineer post in eil please help in this.my mail id eswar310@gmail.com

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please send data bank of quetions answers on analytical instrumentation.

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can any one tell me when ongc placement test and its forms is available????/ pls tell me if u know

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this site is owned by an nonsense

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Questions on flow meters,few questions on HART protocol,

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

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send me last 5 years questions asked in rrb chennai, for section engineer

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