Answer Happy

19. In lighting applications, maximum uniform illumination is provided by A. totally indirect systems using luminous ceilings. B. direct-lighting systems using open reflectors. C. local lamps with exposed filaments. D. light sources of high brightness. 20. The room cavity ratio of a 30 x 40 ft room using flush-mounted luminaires, and having a ceiling height of 15 ft and a work area 3 ft high, is A. 0.67. B. 0.75. C. 1.75. D. 3.50. 21. In an office with a general illumination of 90 fc and a cream-colored ceiling, dark-green walls, light-colored, dull-finished desk tops, and floors with 15% reflectance, the best way to improve the general illumination would be to A. paint the walls a light green. B. reduce floor reflectance to 10%. C. use dark-colored acoustic ceiling tiles. D. replace dull desk tops with glossy desk tops.