Interview Questions Answers in Instrumentation

Questions / { lenin }

Questions Answers Category Views Company eMail

What is the processor scan time of allen bradle control logix processor 5555 lenin lenin123us@rediff.com

1 Instrumentation 9832

What is the purpose of RS Networks

2 Instrumentation 5133

How to calibrate the magnetic flow meter and how to correct the flow if it is showing more flow.

Bohra Industries Limited, TCL,

5 Instrumentation 25923

In electronic board one fuse(rating 230v,100ma)showing 2.5 ohms with multimeter,then the fuse is healthy or not.

4 Instrumentation 6149

Which softwere is required to communicate the S7-300 processor

4 Instrumentation 6763

What is the difference bitween control net scaner and device net scaner

Binani,

Instrumentation 2944

How to make position transmitter feedback reverse i.e at valve close i want 20ma output and at full open 4ma.for the NELES positioner,model:ND8261/TS1.

3 Instrumentation 5611

Answers / { lenin }

Question { 15293 }

when i installed Allen_bradley_RsLogix_500_Pro_V_7.0,after
installation it gives the fatal error.it need activation
file.from where and how i can find its activation file.

Answer

When ever you purchase the RSlogix 500 software they will
give activation flopy with the CD.After installation, to
open the software you need to instal the
Activation.normally it will be available in flopy.To
activate You have to go through Start-programs-rockwell
software-Utilites and follow the instructions.

Is This Answer Correct ?

10 Yes

0 No

Question { 13924 }

What is the role of P(Protional), I(Integral) and D
(Derivative) in PID Controller?

Answer

P(proptional):To control the present difference between sp
and pv
I(integral): To control the past
D(derivative) :To control the futcher

Is This Answer Correct ?

7 Yes

0 No

Question { Honeywell, 31388 }

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

Answer

HhHHH

Hi my dear friend the valve action depends on the
service.If the PV increasing the valve opening also
increasing, the action is direct action.If the PV
increasing, the valve opening decreasing i.e reverse action.

For example if you used one valve to fill the tank.if the
PV increasing, you have to close the valve.i.e your valve
action is reverse to the PV value.
If you used valve in discharge line of the tank.If the PV
increasing, you have to open the valve. i.e your valve
action is direct to the PV value.
SP-PV=Error=Reverse action
PV-SP=Error=direct action

Is This Answer Correct ?

33 Yes

6 No

Question { KNPC, 9720 }

what will be the output of a temperature transmitter if
temperature is 120 degree celcius?

Answer

Hi mydear friend,Transmitter output depends on the
transmitter calibrated range.With out knowing the
transmitter calibrated range diffucalty to tell the output
of the transmitter.If u calibrated the transmitter 0-
120deg.The transmitter ouput will be 20ma at actual temp
120 deg.If u calibrated the transmitter 0-480deg,the
transmitter ouput will be 8ma at 120deg actual temp.

Is This Answer Correct ?

52 Yes

3 No