wats the procedure to calculate no of batteries for ups?

1 Answers  

---

What is 100% protection of generator? Why 100% is not used but 95% is generally used?

0 Answers  

---

what is the first step of dg shycroning ?

2 Answers   ABB,

---

what is the basic differnce between ground and earth

3 Answers  

---

an electric bulb or lamp can operate on ac and dc, if yes then why

5 Answers  

---

generally on the roadside v hav 11kv line which is being step down to 440v line to line....so any1 can tell me which type of transformer they r using whether it is star to delta,delta to star etc...???

9 Answers   Core Solutions,

---

WHY IS THE NO LOAD CURRENT SMALL FOR A TRANSFORMER COMPARED TO OTHER ROTATING ELECTRICAL MACHINES??

1 Answers  

---

why we have to do tan delta test of the transformer oil???

5 Answers  

---

What is the purpose of REACTOR in GIS substation?

1 Answers  

---

how we can check that any motor is faulty may be single phase or three phase?

2 Answers   MAHINDRA,

---

Name different types of circuit breakers and their voltage ratings?

11 Answers   NTPC,

---

what is the difference between UPS and INVERTER?

5 Answers   Techno Engineering,

---