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

compare the thermocouple and pyrometer,which one is the best?why?

4 Answers   Ramco,

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During valve sizing from all calculation you got flow coefficient CV 12,than what it means? like for selecting pressure transmitter if your MAWP is 12 bar than you select a capsule of max. 20 bar which cover your mawp 12 in same way for selecting control valve If CV is 12 than how we use it in selecting valve??????

1 Answers  

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Linear amplifier.

0 Answers   CCIE,

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what are the use of belew gear in general ??

0 Answers  

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what different types of problems do occur while doing instrumentation commisioning and how to solve them? please explain in detail

0 Answers   Process Control Technologies,

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Good Evening all.My question is - For a feed water line to an equipment if i need to measure the flow we will use orifice /magnetic/vortex depend on cost/spec.If i need to measure a ''Alarm''signal and ''Interlock'' from one point i think we can use orifice type in one location with 2 different tapping points - one for alarm and one for an interlock to flow valve..If in case i need to have both these signals(Alarm & interlock) from magnetic flow meter,is it possible??will 2 seperate sensors will be located inbuilt r we can program it ??..i thk we can have one transmitter with these 2 signals...need to know any technical issues are there?pls clarify

3 Answers  

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what is difference b/w the solinoid volve and autodrain?

3 Answers  

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Dear Friends, we are planning to design Power distribution and Fiber optic in the same cabinet.Like Front side Fiber optic and Rear side Power distribution.Is it any possibility of problem occurs like interference etc? Your answer is highly appreciate.

0 Answers  

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can we replace a slot sensor (inductive type) with limit switch (potenial free contact / no-nc type).

0 Answers   Max India,

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how the actually positioner of control valve working? where we gave 3-15psi pressure to I/P converter where it is firstly applied ?- on I/P to positioner then what happen? is control valve operate on 3-15 psi or its bench pressure?

2 Answers  

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Hi Friends , i need one urgent help , i am preparing for M.tech entrance examination , i need some obejective questions related to instrumentation field. where can i get those ? can anyone help me pls ?

0 Answers  

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How d.p. Transmitter can be applied to open tank?

0 Answers  

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