Answer / pvl

This depends on the design of the turbine. I worked with turbine with 4 critical speed bands. It is the natural harmonic frequency where there is maximum vibrations in the turbine. These speed bands can be more than one. Length, weight and steam entry type are the factors which decide the critical speed bands in a turbine.

What you mean by multi stage control vavles?

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Why rdt and thermocouple both give different output .and one things more, how to generate  ohm or mili volt  plz mail me merajalam143545@yahoo.com

0 Answers   Samsung,

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What is the processor scan time of allen bradle control logix processor 5555 lenin lenin123us@rediff.com

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HOW DPT WORKS?

6 Answers   Essar,

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what is stroke check for field instument transmetter's & AOV's

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What is purpose of shield wire?

1 Answers   IFFCO,

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How oil line flow measured?eplain about instruments used and working principle?

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full process of gas turbin?

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Can we use thermocouple in generator of power station replace RTD(pt 100)? if we don't have any place for use RTD.

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how to check thermocouple ,its working or not?

14 Answers   Coca Cola, Ford, Honeywell,

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What is ultrasonic flowmeter?

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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =

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