why we use cascade control and feed forward control in 3
element drum level control measurement of steam drum .what
is cascade and feed forward control system ?give example .
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What is DCS?
what is difference between total flow and flow rate in general ?? explain it with daily life example.
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In instrumentation standard we use 4 to 20ma for transmission , why cant we use 3 to 19ma ?
why level transmitter input is given 4to20ma
how can be connected thermocouple in series?what is the need?
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what are the standards used for earthing instruments in the field?
On drum level, why we are using air to close Control valve?
What unit is used for measuring comp. outlet flow. it is CFM, M3/hr or NM3/hr. ?
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i want to measure temp of hot sand(welding flux) in closed chamber(around 150 deg C).Which is better thermocouple or thermometer?