I have a orifice installed in plant which is design for
0~100 inH2O for 0~80MMSCFD, now due to process change the
maximum flow is change to 120 MMSCFD so for this new
process value what will be the DP across orifice.
A PLC is programmed to drive three motors A, B and C as
After running motor A for an hour, motor B should get ON and
motor A should get OFF.
And after running motor B for an hour, motor C should get ON
and motor B should get OFF.
And after running motor C for an hour, motor A should get ON
and motor C should get OFF.
(That is, a cyclic repetition with time period one hour)
Now, the second condition is:
If any motor gone faulty and is tripped, the consecutive
motor should get ON and
the faulty (tripped) motor should be eliminated from cyclic
The remaining two motors should bear the cyclic repetition
of one hour each.
(For healthy motor take logic as high and for tripped motor
take logic as low)
Now, the third condition is:
When motor A load(Amps) exceeds 60% of its rated load, motor
B should get ON in parallel to motor A.
And when both motors A & B are running in parallel, and if
their load exceeds 60% of their rated load,
motor C should also start in parallel to A & B.
[Here the cyclic repetition is eliminated, until their loads
[Take logic high(1) for load at 60% and logic low(0) for
load at 40%]
Now draw a flow chart or a ladder diagram to fulfill the
How a oxygen sensor & analyzer work at boiler or furnace,
whatâ€™s the principle & science is beyond this, How O2
sensor scene & convert signal & move toward analyzer &
analyzer show reading in percent?
POSSITIVE PULSE IS APPLIED TO AN INVERTER INPUT.THE TIME
FROM THE LEADING EDGE OF THE INPUT TO THE LEADING EDGE OF
THE OUTPUT IS 10 ns. THE TIME FROM THE TRAILING EDGE OF THE
INPUT TO THE TRYLING EDGE OF THE OUTPUT IS 8 ns. WHAT ARE
THE VALUES OF tPLH and tPHL?
why any measurement made interms of pressure is more
to be more precise
most of the flow velocity is made interms of pressure and it
what is the reason behind pressure measurement being
My rtd working well at the same time r/i converter is not working properly.when power is given to rtd..it is giving 30mA and getting 2.4 mA if i remove the compensate leads No matter how many ohms.why it is happening like so?what is the solution?rtd range-0-200deg c& 4-20 mA o/p.please give me solutiin anyone......
sir, i preparing hpcl,ongc,barc,hal exams(instrumentation
engg)pls send a placement papers
What inherent design and operating principles are included in
a modern control system to use predictive maintenance
practices to increase overall system reliability?
Describe the function of Accumulator into the Pump
dear friends, i have seen flow as the selection critriea in
presure guage (bourdon tube) and i would like to know what
is the relation between flow and performance of pressure
other parameters i found in the data sheet are
pressure max. 1ksc
temperature max. - 50 deg c
line size - 80NB
operating range - 1ksc
pr. guage range - 0-2 ksc
we have a s-5 simense plc having op7 .recently on op7
showing error 1.plc not present 2. DB error frequently.
can u have any solution . please send me.
for oil & gas industries which zone is normally preferred?
why? give its example?
sir i m preparing for BARC but i am not getting any papers
to prepare for this exam so please send me some sample
papers to my i.d for the preparation of barc.