What are the usege & different between UPS & batteries with charging system in in Substation?( UPS 120V AC & battery charger is 120v DC)

1 Answers  

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WHY IS THE POWER FACTOR NOT MORE THAN UNITY.

6 Answers  

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if two bulb of 50w &30w apply in series having 230v the which bulb glow bright ,why

10 Answers  

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what is a difference b/w earthing & neutral?

5 Answers   ABB, KEC, Sterlite,

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What is phase angle? and what is importance to measure it?

2 Answers  

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Why the Transformer connection is changing in different transformer?(Like Star & Delta,Delta & Delta,Star & Star,Delta Star) From that connection where it is used?

2 Answers  

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how the arcing is made in ac electric arc furnace? ( between the three electrodes in any sequences or between the electrode & the charge(steel))

1 Answers  

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how we can select a transformer based on a particular load. suppose we have 4 motors of rating 40 h.p , 50 h.p, 80 h.p & 100 h.p. then what rating of transformer we can select. urgent. pls reply

6 Answers  

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how to select short circuit current while selecting a MCCB? how to calculate current for a given KVA and KW load?

2 Answers   GE, PnU Engineering,

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how can we connect the capacitor bank to improve the power factor?

5 Answers  

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Is it possible to measure the voltage of a battery from a single terminal?

0 Answers  

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what is the calculation formula for motor starting torque,running torque, running torque.

0 Answers  

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