Question { L&T, 13281 }

tell me about the instrumentation,what is the actual need
of it ?what are the characteristics of a IC engineer ?

Answer

instrumentation is the field to measure,control and
recording any physical parameters. actual need of
instrumentation is to control and record of parameters for
controling and for future purpose respectively.

Question { 10665 }

what is actual difference between pressure Transducer &
Pressure Transmitter.

Answer

Transducer is a device that can converts one type of
energy into another type of energy. pressure transducer
converts nonelectrical energy to electrical energy.
transmitter is a device that can transmits these electrical
energy.

Question { 9042 }

why we are using 4-20ma why cant we use 4-40ma

Answer

4-20ma is the standard value,because any small changes
occurs we can simply identify when we use 4-20ma. if any
zero error occur we can identify it by using 4-20ma.
according to pneumatic 3-15psi is used.same reson for that.
when 4ma applied corresponding 3psi optain and 20ma is
applied then we get 15psi.

Question { IOCL, 10411 }

without a positionar can a control valve operate? give the
difference of operating with positionar and without positionar?

Answer

we can control the control valve accurately with the help of
positioner.