Answer / ginoop .k.m

ma (Linear) =(% *
16)/100 +4
example - ma=
(25*16)/100 +4
linear ma of 25%
=400/100 +4
linear ma of 25%=
4+4
linear ma of 25% =
8ma

ma (sq rt) = (sqrt
of %*16)/10 +4
example -
sqrt ma of 25% =
(sqrt
of25*16)/10 + 4
sqrt ma of 25% =
(5*16)/10 +4
sqrt ma of 25% =
8+4
sqrt ma of 25%
=12ma

Answer / sampath

Sq.Root { x / 100 } * 16 + 4 = ____ mA
where, x is the % ( percenteage value )


For eg, 25% Sq.Root { 25 / 100 } * 16 + 4 = 12 mA


50% Sq.Root { 50 / 100 } * 16 + 4 = 15.31 mA


75% Sq.Root { 75 / 100 } * 16 + 4 = 17.86 mA

Answer / jackass

So, the way you would go about doing square root extraction is by using an analog multipler. An analog multiplier has three inputs Vx, Vy & Vz. The output is given by Vo = (Vx*Vy)/Vz; If we set Vy = 1V and Vo = Vz through a feedback loop, we get Vo.^2 = Vx => Vo = sqrt(Vx).

If the interviewer further asks about an analog multiplier, you could mention that it can be designed by a combination of logarithmic/anti-logarithmic amplifier and an adder.

Hope that helps!

Why DP transmitters are subjected to high static pressure test of 100 bar. Though they will be used for very small pressure range

4 Answers   HPCL,

---

if we have 380 KVA DG. how to calculate Power Factor. With detailed formula

1 Answers  

---

How does a redundant controller comes in line when the main controller fails??

3 Answers   Yokogawa,

---

applications of plc in printing and packaging?

0 Answers  

---

how to turbine speed measurement?

0 Answers   Jindal Steel and Power,

---

what is the difference between SCADA and DCS?

5 Answers   ACC,

---

what is start up vent valve ? why it is used in boiler?

8 Answers   ACC, Bhushan Power Steel,

---

List three types Level Switches with their working principles

0 Answers  

---

Can all intrinsic safe transmitters are provided with inbuilt zener barriers? why

2 Answers  

---

how flame detectors sense the flame.

3 Answers  

---

which processor is used in dcs.

0 Answers   ABB, Wave Distillery,

---

Explain PID controller tuning & any one method used for it.

1 Answers   L&T, Oil India,

---