Answer / ibrahim s

This is nothing but SCADA(Supervisory Control And Data
Acquisition), this can used to monitor and control the
process variable along with PLC.

Answer / raj anu raj

As the name implies, like a supervisor who supervise his
subordinates functions and control over them.
Particularly in SCADA(supervisory control and data
aquisition)from HMI ie.. simply from monitor screen u can
supervise the various functions in the plant and also
control them by changing set points etc.. .Usualy SCADA
comprises of PLCS(functions as supervisor in auto), a
communication mode to receive data to and fro and a manual
interface ie.. for example graphics to communicate with
the PLC
Regards

Answer / khan

scada is abrreviated as supervisary control and data aqasition where the all data which monitered by the user is collected and aquared.the data can means what ever the set point acc to the program is can changed from it.
although the whole operation is monited by mmi man machine inteface first it send to the control unit then to the fild unit .

Why 4-20 amps is being used in instruments? Why cant we use any other range instead of 4-20 amps? Why only 4 amps is taken as lower limit and why 20 amps is taken as the higher limit?

0 Answers  

---

Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72

0 Answers  

---

What is the purpose of valve positioner. Explain 4 uses.

2 Answers   SRACO,

---

send me last 5 years questions asked in rrb chennai, for section engineer

0 Answers   RRB,

---

What is live zero and dead zero

2 Answers  

---

---

If we increase D what will be the controller action?

2 Answers  

---

Hi,can anyone help me out with PhD programs related to Instrumentation field?I have a degree in electronic Instrumentation?

0 Answers  

---

Why the Air Tank Accumulators required for the single acting actuators SDV's or BDV's as I see in some Schematic diagrams of ROTORK ??

2 Answers   L&T, Siemens,

---

Isometric drawings are generated during _________________ phase of a project

0 Answers  

---

How will you calibrate an interface level trol/normal level trol in line and in w/s?

1 Answers   CCIE,

---

what is solenoid valve?

1 Answers  

---

Explain about signal isolator

1 Answers   TCS,

---