Why we are testing cables with dc?
To build up a steady voltage (potential)between test points
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UPS battery Back time = no.of Batteries * Ah of the Battery / output KVA * 130 ? what is the 130 means ? can any one help? because all are using this formula how its came 130?
Suppose i Have an Ac motor of 25Hp 1500 Rpm 50 Hz Can i run a motor 2500 Rpm by AC drives by increasing a frequency either it safe or not ....
what is positive , negative & zero equivalent system resistance
what is ferranti effect?
can transformer of different kvas be paralled
I know the Capacitor value- 12.5KVAR, voltage 440V gas filled, then what is the formula for calculate the microfarad value for this 12.5KVAR capacitor
How do I calculate/select Droop CT ratio for various capacity of generators?
(In MEP services) HVAC in AC Plant room what else can we provide if the chiller is not considered?
WHAT IS THE ANALYSIS OF FREE WHEELING DIODE IN FULL WAVE CONROL RECTIFIER?
How to calculate the size of the cable? for exp i want to use the load of 10HP
how we done power management?
IR value for 30kw lt motor