Question { 7468 }

what is Micro-switch and where it is used......?

Answer

Micro switch is just like our ordinary switch but the
difference is that it regains its original position i.e.
normally close contact upon removal of force to it. it has a
spring lever mechanism. & two contacts nc & no. its used for
safety purpose to limiting the movement of some movable
parts & to take a feedback also.many applications are there
in which we can used it.

Question { Exxon Mobil, 25724 }

what is meant by calibration

Answer

calibration is procedure in which we compares the readings
of our measuring instrument/transmitter with the reading of
standard & certified calibrated instrument/source. in the
same environment & working condition & adjusting our
instrument/transmitter readings to match with the standard
instrument readings by adjusting the SPAN & ZERO. If it is
not possible to adjust span & zero than we can only do
verification of our instruments not calibration.

Question { 4961 }

A motor is taking 15 Amps at no load and 60 Amps at full load.
and a valve has to open 10% at full load and 80% at no load.
How to draw ladder logic.(PLC).

Answer

U dont need any plc logic for such application since u can
do this project with the help of simple transducer which
will gives the mA o/p with respect to ur Amps. & just i/p
converter which will help u to open ur positioner valve.

Question { 4253 }

who's take first position in process in the timing of new
installation flow transmitter and control vavle. give the
answer with logical trick.

Answer

obviously the control valve should be installed first.
because we must restrict the flow first by placing valve in
line. then only we should think about to control the flow by
flow transmitter.

Question { 9827 }

what is orifice plate?
Give me best answer?....plz

Answer

orifice plate is used in liquid flow lines to measure the
flow rate by creating a differential pressure across it,
which is than converted in to flow rates by means of some
circuits. in some cases it is also used to reduce the
pressure in line.