Answer Posted / mark chen - maran engineering

More info:
The ID fan serves two functions:
1. Create a negative pressure in the furnace compared to outer pressure. if the furnace has leaks, a positive pressure in the furnace will cause gases to leak out. instead of building an expensive totally leak proof furnace, a cheaper design may be used.
2. increase the flow velocity of furnace gases. After the furnace the flue gases cool, especially when they pass various cleaning processes, so they may not reach the height in the atmosphere where they are distributed, and stay condensed above the plant site and nearby area. a high stack and increased flow velocity help here.

how we decide the require size is this for a known current at fuu load?

1967

---

why tertiary winding is used in transformer with diagram?

2255

---

1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

2042

---

Which motor will you choose which can operate in both lagging as well as leading power factors?

1159

---

which model T or pie model is prefarable in power syatem

1887

---

How Load Factor, Demand Factor, Diversity Factor etc best applied in designing an electrical circuit? Is it allowed to consider these factors in each and every panel in an electrical distribution system? Can any body suggest a good book for reference?

2898

---

can any one tell in easy method for circulating current ??

2176

---

What is the lower limit of break-down voltage of converter transformer.

1917

---

What is the disadventage of gland earthing(power cable) if any. ?

2124

---

how to compute kAIC?  with formulas...

4244

---

On 400 amp factory load how kvarh capacitors provide

1708

---

In a Impedance Based Distance Relay (Quad Characteristics) - Could there be two different Line Angle(RCA) for Ph-Ph & Ph-Gnd? If So Kindly Let me Know.. Where, What are the advantages of the same?

1433

---

which type of effect of turbine and generator reverse power protection ?

4197

---

who many types of fire explane with exmple

2222

---

what is the difference between electrical choke and electronic choke?

2518

---