A corridor is lighted by 4 lamps spaced 10 m apart and suspended at a height of 5 m above the center line of the floor. If each lamp gives 250 candela in all directions 4. below the horizontal. The illumination at the point on the floor mid-way between the second and third lamp is а. 5.15 1ux b. 7.71 lux c. 6.27 lux d. 8.18 lux 5. A drawing office containing a number of boards having a total effective area of 60 m is lit by a number of 40 watt incandescent lamps giving 11 Im/watt. An illumination of 75 lux is required on the drawing boards. Assuming utilization factor of 604 and depreciation factor of 854. Estimate the number of lamps required. а. 18 b. 20 с. 19 d. 21
Load flow analysis
Load flow analysis is a study or numerical calculation of the power flow of power in steady-state conditions in any electrical system. It is used to determine the flow of power (real and reactive), voltage, or current in a system under any load conditions.
Nodal Matrix
The nodal matrix or simply known as admittance matrix, generally in engineering term it is called Y Matrix or Y bus, since it involve matrices so it is also referred as a n into n order matrix that represents a power system with n number of buses. It shows the buses' nodal admittance in a power system. The Y matrix is rather sparse in actual systems with thousands of buses. In the power system the transmission cables connect each bus to only a few other buses. Also the important data that one needs for have a power flow study is the Y Matrix.
Types of Buses
A bus is a type of system of communication that transfers data between the components inside a computer or between two or more computers. With multiple hardware connections, the earlier buses were parallel electrical wires but the term "bus" is now used for any type of physical arrangement which provides the same type of logical functions similar to the parallel electrical bus. Both parallel and bit connections are used by modern buses. They can be wired either electrical parallel or daisy chain topology or are connected by hubs which are switched same as in the case of Universal Serial Bus or USB.
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