Answer / vijay krishna

profi bus communication is not suitable for more distance
and will be get affected by emf.signal strength will also
low compared to ofc commn.only thing is less expensive.

explain Cascade Control strategy with the help of a block diagram. also exlain its working in a distillation column

2 Answers   ABB, Sabic,

---

What is mean by Ethernet, Device net and Control net? For what application we are using these?

4 Answers  

---

Explain about 4 wire instrument concept & tell about its wiring fron sensor in Field to PLC panel.Explain with an example?

3 Answers   IOCL,

---

How oil line flow measured?eplain about instruments used and working principle?

0 Answers  

---

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

2 Answers  

---

what is the procedure of O2 analyser calibration?

3 Answers   Thermax,

---

i am confusing about differential pressure transmitter as i seen so many DPTs in different ranges how can we calculate level and flow with mmh20 plz tel me

1 Answers  

---

what are the documentation and instrument identification system used to identify the correct device to be calibrated? name atleast three.

1 Answers  

---

Can I put my meter across an RTD to check it safely witout tripping the equipment when it is connected to an monitoring device eg.RTD module or IQ 1000

1 Answers  

---

wat are the interview questions asked in air india for post service engineer

1 Answers   AirIndia, Shree Renuka Sugars,

---

How can test or measure the probe and extension cable to identify if the problem at the probe or cable or at the driver it self? (pleast notify the measuring method)

0 Answers  

---

WHY RESISTANCE TEMPERATURE DETECTOR IS AN ACTIVE DEVICE

2 Answers  

---