Answer / biswarup das

A lead-lag compensator is a component in a control system
that improves undesirable frequency response in a feedback
and control system. It is a fundamental building block in
classical control theory.

We are using it in varied discipline such as robotics,
satellite control, automobile diagnostics, laser frequency
stabilization and many more. It can also be used in digital
control.

Answer / prabudas

Compensator is used to compensate the deficiency in the performance of plant.
A lead compensator is used to improve the transient response and the steady state response is partially improved.
A lag compensator is used to improve the steady state response and the transient response is partially improved.
If we need a better transient response we should choose lead compensator.
If we need a better steady state response we should choose lag compensator.
If we need both transient response and steady state response we should choose lead lag compensator.

Answer / parmar.ic@gmail,com

THe lead compasator is suitable for systems having
unsatisfactory transient response but it provides only a
limited improvment in steady state response
lag compasator is suitable for systems having
unsatisfactory transisnt response but it provides only a
limited improvment in steady state response.
lead lag compensator is used in unstable system to convert
the stable system .

canu tell me why 4-20 ma and why not this 3-25ma?please give reason of this value.

6 Answers  

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I have a Control VAlve having size of 2 ".Only the known parameter is Pressure drop . Its 2 Kg. Then How to calculate control valve sizing means Cv.

0 Answers   JSW,

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a laways iface problem with brine level transmitter sealing diaphram a laways giving error and maximum reading i made re range and adjust with side glass but during commission it giving gap reading between it and side glass i need help from expert to explain how to calibrate it. note:dp transmitter yokogawa company

1 Answers  

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Sir,I am going to sit for IOCL written test exam. recently.Can anyone tell me the name of 'Objective type Question Book on Instrumentation Engineering ' which will help me. Pl. mail to bidyut_71@rediffmail.com / bidyut.saha2008@indiatimes.com / bidyut.saha09@yahoo.in

0 Answers  

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How much voltage we are using at switches?

4 Answers   Edac,

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

0 Answers  

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suppose, after calibrating a transmitter we fixed it in a process line. At live zero condition the Tx shows 4.5 mA. what should we do to make the Tx show 4 mA? If we adjust zero, will it not affect the calibration?

4 Answers   ABG Shipyard,

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what are the different types of Protocols? & their applications.

6 Answers   Infosys, Sitara Chemical Industries, Syntel, VSNL,

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The performance of a pump is monitored by measuring the ________ and _________ pressures

1 Answers  

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what pressure transmitter?

8 Answers   Bhel,

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In dcs contol valve parameters showing like this Gain=1 or 2 , ti=7 sec, td=20sec. But temp,pressure,level control valves we are using in which type parameter side using ti,td clearly tell me

1 Answers  

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diff c and c++

1 Answers  

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