Q: (i)Determine the maximum power that a 430 km, high-voltage 3-phase transmission line can transmit if the system voltage is 550kV and the impedance of the line is 0.5 ohm/km.
(ii)If it is desired to be able to deliver 2000 MW, by how much (in percent) would the reactance of the tranmission line need to be reduced?
Q:Determine the number of lighting fixtures required to illuminate a 2000 sq ft area to a level of50 fc. The CU,LLF and multiplying factor are 0.6, 0.85 and 0.87 respectively. Each fixture containts 3 lamps, producting 3000 lumens perlamp.
Q: A point source of light has a value of 3000 cd in the direction of interest. Determine the illuminance at a distance of
a)8 ft
b)5m
from the source.
Q:A point source of light has a value of 3500 cd in the direction of interest. The angle of incidence of this light ray with respect to the vertical axis is 40 degrees. Determine the illuminance at a distance of 12 ft from the source