Answer Posted / sks

AC drives known as VFD(variable frequency drives) operate
differently from DC drives known as VSD(variable speed drives )
the most basic difference being that DC drives may have a
constant dutycycle( ON to On-Off ratio) on PWM signal but AC
drives must have a variable duty cycle throughout as they
are frequency based and can't be instantly increased or
stopped at min or max frequency.

whats the abbreviation of IOP? is it instrument of power or input open problem?

1141

---

i want to find out iffco get test paper

13077

---

There are two chlorination tonners both are connected to two pressure swithes and the pressure switch is connected to SOV which operates the valve to changeover the tonner selection i.e if pressure one tonner goes low the other tonner should come in line if it is inautomatic selection design a circuit using relays ?

1947

---

What is the difference between working pressure and calibration pressure of a control valve

3034

---

I need to know steps to Calibration Valve Guard......

1468

---

What are the application of bernoulli’s theorem?

1135

---

What is the right procedure for adjusting the gap voltage of bently nevada vibration sensor?

15478

---

What is force balance principle?

1152

---

Questions on flow meters,few questions on HART protocol,

1977

---

Can anyone convert a 5/2 way or 3/2 way valve into an ISO valve?

914

---

What is difference between Ionization heat and bimetallic heat

1626

---

what is maxdna ?. explain about the software details.

4360

---

principle of automatic votage regulator

2121

---

How to erection of DCS Panel at site step by step

1488

---

please send the sample qustion paper for iocl written test ..

3693

---