Answer / parmod kumar

it has the same two power sources, and a transfer switch
that selects between them. It is the exact opposite from
the standby UPS because it has reversed its sources: in the
online UPS the primary power source is the UPS's battery,
and utility power is the secondary power source!
Under normal operation the online UPS is always running off
the battery, using its inverter, while the line power runs
the battery charger.

what is the main difference b/w contactor and relay

2 Answers   Pace Pharmaceuticals,

---

what is the use of neutral displacement relay

1 Answers   OCL,

---

what is the tolerance for the magnetic balance test conducted on the distribution transformer?

0 Answers  

---

Why insulation layer of a High Voltage cable is more than a current carrying cable?

3 Answers  

---

what is electric traction?

26 Answers   TCS, Volvo,

---

WHAT ARE THE DFT AND RMS MEASURMENTS PRINCIPLE IN NUMERICAL TECHNOLOGY OF POWER SYSTEM ?? WHICH IS BETTER IN WHICH QUANTITY MEASURNMENT??

1 Answers  

---

WHY THE FREQUENCY IS 50 HZ IN INDIA.CAN WE USE SOME OTHER FREQUENCY.IF SO WHAT IS THE RANGE AND WHAT WILL BE THE EFFECT IN PRESENT POWER SYSTEM IF WE CHANGE THE FREQUENCY AS YOU SUGGEST ?

32 Answers   L&T, MCL,

---

WHY L-G FAULT IS MORE SEVERE IN TERMS OF RRRV?

0 Answers   Engineers India Limited,

---

When a square wave is applied to primary of a transformer then what will be output wave form of secondary ?

2 Answers   Sail, TCS,

---

what purose of the double circuit transmission line phase of the line phase changed for circuit-1 for Circuit-2 R-Y-B B-Y-R

0 Answers   NCC,

---

What is the difference between a 3 winding and 2 winding Potential Transformer

0 Answers   Engineers India,

---

Why Utility Distribution System in India is mainly at 11 kV? Why not Utility go for 33 kV?

0 Answers  

---