Answer / mrmk

Cold Loop checking: Checking of wires continuity of
respective field instrument-Junction box-DCS/PLC
marshalling panel terminal.

Hot loop checking: Once you powerup your field instrument
through DCS/PLC system, by stimulating process input from
respective field instrument and cross check its responce at
DCS/PLC sytsem

Answer / gray

Following the IEC guidelines (62382), there is no such
thing as a cold and hot loop check.

There is a wiring/ point to point that all should do before
carrying out a loop check from field device to DCS display.

What is the procedure of calibration of Load cell?

0 Answers  

---

What is DCS?

5 Answers   Adani,

---

any body please send me the old question papers of ongc test.

0 Answers   NTPC,

---

1.what is the effect of vapour presuure in orifice plate flow measurement 2.which is more effective 2 pressure sensors or one single differential pressure sensor in orifice plate measurement 3.how to design a v/i converter and i/v converter 4.how many type of thermocouple are there 5.how many leads are there in thermocouple measurement 6.how pressure sensors are connected in level measurement in differential pressure method 7.what is the output of capacitive pressure sensor (ac or dc),how its o/p is signal charactarized 8.what is the physical meaning of discharge coeeficient,why it is calculated,orifice plate what is its value,why it is less than 1,Q at upstream is equal to or not equal to Q at downstream of orifice plate why?what is vena contracta in orifice plate 9.why rotameter is called variable area flowmeter,it can measure flow even if area is not varying,why it is made tapered 10.design a 10 bit counter ,which counter you will prefer 11.how to remove self heating error in RTD 12.which is more sensitive pt100 or pt50 13.why thermocouple are connected in parallel 14.what is lead contact error in RTD,how to avoid 15.what is P,PI,PID,PD controller,why there is no ID controller 16.what is override,split range,sequential,ratio,feedforward,cascade controller 17.why we moved from SR to JK and then JK to master slave JK flipflop,give correct reason 18.how to measure level of a closed container which contains vapour and liquid,remember no vapour gas should be leaked,so ultrasonic and capacitive is not an option,design another method 19.how to design horse race counter including sensors and signal conditioning element 20.what is bevelling

0 Answers   BARC,

---

Lube oil pressure transmitter local it's showing 9.8 kg/cm2 but dcs side it's showing 9.26 like that what is the reason?

3 Answers   Edac,

---

What is SCADA ? WHAT is it role in DCS ?

3 Answers   Honeywell,

---

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

2 Answers  

---

How can one improve linearity of an RTD based temperature measurement system?

2 Answers   Honeywell,

---

Why we use 3-15 psi air for control valve input?

2 Answers  

---

FOR CO/CO2/O2/NOX applications which of the following manufature is best? and what is the basic principle of gas analysers? ABB/YOKOGAWA/EMERSON/SIEMENS/TELEDYNE/THERMOFISHER

4 Answers  

---

meaning of SMART

3 Answers   ISRO,

---

NPN transistor, SCR, Zener diode, LED, Varactor diode, Vortex meter, RTD, Resistor, Crystal

0 Answers   CCIE, RTD,

---