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Off line UPS System
Again the two switches are used in this type of ups as online ups. The difference is that here the main static switch remains normally ON and UPS static switch remains normally OFF.
Here the load is directly connected to the main supply through main static switch. Under the condition of power failure, main static switch operates to disconnect the mains from the load and then ups static switch becomes ON to connect the load batter by bank through circuit. Battery bank suppliers the power to the load.
Using star-delta transformation, calculate the current flow through RL.
Explain Corrosion. Corrosion: The process of constant eating (or destruction) up of metals (by the surface) by the surrounding is termed as corrosion. These metals are corroded
the electrical network show below
The resistivity of pure copper is 1.56 micro-ohm -cm. An alloy of copper contains 1 atomic percent nickel has a resistivity of 2.81 micro-ohm-cm. An alloy of copper containing 3-
The Lennox to Bowmanville 500 kV circuit, spanning a distance of about 180 km, has series (inductive) impedance j 0.0224 pu and shunt (capacitive) admittance j 2.34 pu, quoted on b
prove abc+abc''+ab''c+a''bc=ab+ac+bc
Calculate the following for a 2 hp and a 20 hp dc machine, each rated for 500 rpm. Use data from the Study Plan 1 data sheet, including "hot" armature resistance value for all cal
Explain ferrites and its uses in high frequency devices. A group of magnetic alloys show the property of magnetisation that change, with percentage of various constituent atoms
Q. Show the Subtraction Method? For this procedure (method), start with a weighted position value greater that the number. If the number is greater than the weighted position f
Properties of Conductors and Insulators: This unit provides the basic characteristics or properties of the most common materials which are classified as semiconductor, conduct
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