Answer / mahesh

LOADED UPS KAV/BATTERY LOW VOLTAGE=I(DC)

THEN SEE THE BATT. CAPACITY

FOR EXAMPLE 100AH BATT. AND DC CURRENT 100AMP
SO BACK UP IS 1HOUR

Answer / rakesh

it is purpus supply input and output supply 230 volts

Answer / bala_vlsi

Fomula

Watt/d.c voltage )x 1 / (p.f )x (1/ Efficiency) x Required
Hrs

Example

Data
500 W = load
12 V = d.c vOLTAGE
0.9 = P.F (ASSUMED )
0.8 = mAINTAINANCE fACTOR(ASSUMED )


500 / 12 X (1 / 0.9 ) X (1 / 0.8 )X 2= 115 AH Battery is
need to priovide 2 Hrs back up supply

what kind of battery is used in laptops

4 Answers   Pepsi,

---

how many single tension hardware are required on a double circuit transmission tower?

0 Answers  

---

can we use IGBT as a AC-DC converting device in the applications?

2 Answers  

---

What types of CMOS memories have you designed? What were their size? Speed? Configuration Process technology?

0 Answers   AFG, Afghan Telecom, GE, IBM, SECL, Sun Pharma, TNPL,

---

HOW TO CONVERT SQ MM OF A CABLE TO DIAMETER, EG. CABLE SIZE IS 185SQ.MM WHAT IS THE DIA OF THE CABLE??????????????

3 Answers   Parsons, SWAN,

---

---

following are the questions asked in interviews: 1) Considering the short circuit fault, which switchgear is preferable, SFU OR MCCB? Which operates faster? whicg one is popular in Indian Market and why? 2)Define SCPD. What is type2 coodination? 3)Why the contactor rating is higher for the fuseless selection than for fuse selection? whether the ratinf of SFU or MCCB remains the same in both the cases? 4)If the HP rating is known then can you calculate the ratings of L.V Switchgear(SFU/MCCB, contactor, OLR) without using the selection chart?

0 Answers  

---

which is the most advanced form of SF6 BREAKER?Can we use other gases to quench the arc?

0 Answers   TATA,

---

how to calculate single phase motor efficiency ?

0 Answers   Bhel,

---

How stabilizer works??

0 Answers  

---

What is inrush current?

0 Answers  

---

kindly arrange to send me RRB Bangalore previous question paper for JE/Electrical and JE/Signal I am going to write exam on 2010

2 Answers  

---

How to Calculate Stc Rating of an indoor type VCB Panel? What is a full form of STC?

1 Answers   ABB,

---