Question { 3832 }

My question may be very basic or childish but this question
still persists in me, someone plz help me
1.why do we go for differential equations to analyze a system?
2.why do we solve it using matrices, is there any specific
reason for using matrices other than the stories like it is
simple,faster etc.

Answer

if u model the any system like
mmechnical/electrical/pneumatic establish relation b/w
input and o/p force,mass,friction etc a=dv/dt,f=m(dv/dt)
model all forces and adding all forces we get diff equation
homo/non hom solve by using laplace trnsformation.but here
initial conditions assumed to be zero solution is state
space analysis using matlab ,so matlab variables are
arrngend matrix format.

Question { Honeywell, 31407 }

what is the meaning of reverse action and forward action of
control valve...

Answer

for pressure increases the % of valve opening increase in
direct action .but in case of reverse actoin pressure
increases the % of valve opening decrease.

Question { Wartsila, 6820 }

HELLO FRIENDS PLZ EXPLAINE ME WHAT IS ORIFICE?AND HOW WE
ARE USING IT IN INSTRUMENTATION

Answer

orifice is variable restriction flow meter,it has two
tapings befor restriction and after restriction connect to
differntial manometer this pressure head is propotional to
the flow rate,it is based on bernuolis law and continutiy
equation.

Question { HAL, 34236 }

what is the difference between the microcontroller and PLC?

Answer

micro controllers used for specific task only and it cant
accept analog inputs directly.using plc we can control more
micrcontrolled based control loops.

Question { HCL, 8188 }

what is the diffrence between plc&dcs

Answer

simply plc is a controller we can control analog and digital
i/o s but i/0 limit is there in plcs.dcs is nothing but
networking of plcs.EX
plc1+plc2+smart instruments+mc baesd instruments all are
controlled by dcs at a time .ic has redundancy also