Answer / sid

1 TR = 400 CFM is a rough calculation used for the designing of duct used as a common rule....actually the cfm required to make 1 tr may vary according to the coil manufacturers.....so when designing duct using standards ,always check the cfm required to make 1 tr from the unit specifications.

Answer / virendra paril

12000 BTU

what is surge suppressor?

5 Answers   Essar,

---

why ac supply neutral should earth not in dc (-)

2 Answers  

---

How many no. of earthing pits required for commisioning a new 320KVC DG Set????How????

6 Answers   Emerson,

---

I have lowered a submersible pump having 100 LPM discharge & 130 Mts. Head, 15 HP rating on borewell. After lowering 108 Meters, It is taking 39 amps & blowing the fuse. Can someone put light what is the cause behind it ?

1 Answers  

---

for preparation of design note of 11 / 220 kV , 3 phase, 63 MVA transformer how can calculate or consider the iron losses and copper losses

1 Answers  

---

Why we are using only Dyn11 tranformer in distribution system but not using a Dyn1 in distributing system?why not and advantage and disadvantage in both

0 Answers   Jindal,

---

which protection function should measure RMS value of current&DFT value of current?

0 Answers  

---

Dear all, I just want to ask an expert on this forum for some insights. For the magnetic balance test, when applied voltage on a Delta-Star transformer e.g. Dyn11, the following relationships apply for HV side: 1.  H1-H2 = H2-H3 H3-H1 2.  H2-H3 = H3-H1 H1-H2 3.  H3-H1 = H1-H2 H2-H3 For the LV side also: 4.  X1-X0 = X2-X0 X3-X0 5.  X2-X0 = X3-X0 X1-X0 6.  X3-X0 = X1-X0 X2-X0 Is there a similar pattern for Y-d, Y-Y, D-d? And how about Y-z, D-z, Z-y transformers? I've tested a YNzn5 transformer and for LV side I don't see the pattern. In this particular case I got for LV side the following (see values below): H1-H0  H2-H0  H3-H0    X0-X1  X0-X2  X0-X3 128.0  119.9  7.2      29.2   13.3   15.8 70.7   128.4  59.2     23.4   22.0   3.6 7.2    120.1  128.1    13.4   29.3   15.8 What is the relationship here for LV? For row 1 I see the relationship, for row 3 I also see but it's shifted, but for row 2 I don't see such relationship. Any suggestions, answers, someone?

0 Answers  

---

what are types of servo motors

1 Answers  

---

sir please send me previous year questions of jspl of electrical section through which i could prepare myself fpr the test.

0 Answers  

---

why protection meter is always connect to star

1 Answers  

---

How are calculated the aluminium busbar cross section area?

2 Answers  

---