Answer Posted / m talha aziz(cap)

In a balanced draft boiler you actually have both F.d fan and I.D fan.
1. I.D stands for Induced draft Fan whereas F.D stands for Force Draft fan.
2. ID fan(Induced Draft Fan)basically pulls out flue gas from
the furnace of boiler. FD fan(Forced Draft Fan)supplies the
required air into the furnace for combustion of fuel.
3. It is located between dust precipitators(ESPs) and Chimney. Obviously it handles hot air/dust. F.D handles air at normal temperature. The capacity/power rating of ID fan will be more than that of FD fan.

in control scheme dc logic wiring commonly using negative loop,what is the reason?if we use positive looping what will happen?

2350

---

how can we phase identification in a distribution line,how we recognise that which phase is coming for a house hold connection.help me............

2089

---

Differentiate between Zero and Negative sequence current

1921

---

how to commissioning the genset with amf panel?

2417

---

at what basis/standard we have to arrive the current density of aluminium/ copper in busbar?

2134

---

what is meant by the phrase 'static load' in case of shorting in a generator excitation system?

2151

---

When we use 3 terminal resistor?

1258

---

how to select the mpcbs and contactor for 3 phase 30 hp star delta motors.for plc control.and tell me the calaculation for future use.

1995

---

HOW TO CALCULATE HV CABLE SIZING?

3228

---

what is the reason for indication of light in the earth lamps of main switchboard.if there is an earth why does one lamp get dim and the other two bright.

2354

---

Why we use 4-20 mA Analog signal for the PLC input? Why not 0-20 mA? Why not 5-25 mA?

2905

---

In vapour absorption refrigeration machine fluids used are

1249

---

Explain using drawings what is reverse PID action w.r.t PID controllers.

3462

---

What is the working principle of servo motor? And explain it.

1945

---

low frequency protection why recomend?

2288

---