Why the Proximitor supply should be Negative voltage? Why should not we give Positive voltage to the Transducer?

6 Answers   Moser Baer,

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how many type of control valve?

10 Answers  

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KAlman filter code for two dimension?

0 Answers   Tisco,

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What is Span Error

0 Answers  

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How can we say that accuracy of measurement increases by using 3 or 4 wire RTD? because for example: If resistance of RTD element is say r ohms and Resistance of the cable from transmitter to RTD is R ohms And if 4 wire RTD is used, ____._____________________ R ohms | |_____._____________________ R ohms / \ / r ohms \ \ | |______.__________________ R Ohms | |_______._________________ R ohms Then the actual resistance measured will be: Total = r + R/2 + R/2 = r +R Ohms Note: r+R instead of r ohms. hence error

2 Answers  

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all types instrumentation questions want

0 Answers   Bhel, Descon, HBL Power Systems,

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how can we understand about dcs "bailey infi 90 dcs system" . how its work how signal come from field how it process and how o/p creative by controller. how its cards work.the bsic principle of working of dcs

1 Answers  

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i am going to attend ongc exam this coming june for Graduate Engineer Trainee post if anybody knows the question pattern or have experience plz share it with me

3 Answers   ONGC,

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Pls can anybody tell me how much memory plc's has?in byte or in Kb

2 Answers  

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Lube oil pressure transmitter local it's showing 9.8 kg/cm2 but dcs side it's showing 9.26 like that what is the reason?

3 Answers   Edac,

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What is sensitivity of K type thermocouple? Is polarity important in thermocouple connections?

3 Answers   Honeywell,

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why we require Differential pressure?Why we use Orifice Plate?

3 Answers  

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