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

2852

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If any cable burnt how can we identify it burnt by high current of high voltage? 

2407

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What is the function of NER and NET?

2409

---

why we used dc supply for field in dg set

2346

---

Where is the best place to mount  distribution panel in a house.

2030

---

for the steam temp 420dec de superated to 120deg how much of water required

1934

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My vendor filled liquid oxygen in our 11000 liter capacity tank. He filled from 1400 MMWC up to 3200 MMWC. I followed the provided conversion table and found that we had been supplied 1800 MMWC liquid which is going to yield 2815 cubic meter. On the other hand, the vendor claims that he supplied as follows:- 5236 cub mtr(3200 MMWC)-2124 cub mtr(1400MMWC) = 3112 cub mtr. I fear that he wants to charge 297 cubic meters extra. He claims that my method was wrong and his was right. He says that this disparity is because of the conical shape of the base of the flask. I will be thankful if somebody can explain me the truth.

3322

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how can i change the rotation of the AC single phase induction motor and show me by diagram

1754

---

in general it is observed in power stations, the tertiary winding is used in higher rating Y-Y auto transformer but not in Y-Y power transformer. is the tertiary winding is compulsory then why it is not using in power transformer 

1765

---

how  do you choose the cable size as per amps rating & the voltage drop for the same.

1744

---

what should be RCC material i.e iron rod(mm)x cement x stone x sand for laying of slab L 42'x B 22'x tk 0.375ft = 1nos & column of H 17'x15"x8" 2nos.

2305

---

Explain about safety integrated level protection? . How it was differ from other protections ?

1708

---

For Wet Mix Mecadam design what is Optimum moisture content

2005

---

may i know the detailed description of cutting length

1996

---

 why Fahrenheit unit of moistur analyzer transmitter

2191

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