Answer / gonzales

In boiler when tripple element controlling required

Answer / nikhil

In some applications, the compensation provided by feedback control is not sufficient.

Also, the feedforward control is faster but it is difficult to predict all the manipulated variables.

Hence a combination of both is used.

Answer / r.murugan

Feed forward control required three inputs like drum level
control (steam flow,drum level,feedwater flow

closed loop control with feedback only applicable

Answer / bhag singh

control valve

what is the input to be given digital temp controller during the the calibration time?

2 Answers  

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why we use sensing type(NPN)on a vibration monitring system not a (PNP)sensing type

1 Answers  

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deference between DCS and PLC including date processing and architacture.

11 Answers   Jindal, Shell,

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how can be calibrate flow indication transmitter (rosemount) it shows excess milli amps nearly about 24 ma on full scale, but its scale was set on 20ma on full scale..???how can be simiulate..???

0 Answers   Siemens,

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Explain level troll principle & interface level measurement.

1 Answers   ADMA OPCO,

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Why we use 250 ohm resistor in series with HART protocol communication?

13 Answers   Chemtrols, Instec, Sabic,

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Q- In the process of checking AC through Phase Tester our body is the part of circuit but we don't recevie Shock, Why ?

2 Answers  

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what is use of communication wire in multipare cable(oil and gas field), why this communication wire not used in single pair cable?

0 Answers  

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A DP transmitter is used to measure the level of an open tank. The drain line of the tank is connected to a control valve, and is configured as, if the level of the tank is 90% the valve should get open 10%. And if the tank level is 10%, the valve should get open 90%. Draw wiring diagram and explain how to configure DP transmitter and control valve using HART communicator. If the span error at output is 1%, what will be the %opening of the control valve at 60% level of the tank?

0 Answers  

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What is the principle of capacitance type level transmitter?

0 Answers  

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what is the Difference betwee the Hart and smart series Pressure transmitter

1 Answers   HPCL Mittal Pipelines Limited HMEL, Kastech Instrumentation,

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what's the reson that,Load is not same on VFD I/P and O/P Side.whenever DOL condition load is same I/P and O/P side.

2 Answers  

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