Fall 2006 - 1.0 Multiple Choice Questions (I point each):...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 10
Background image of page 11
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1.0 Multiple Choice Questions (I point each): One point each. Circle the letter of the correct answer. 1.1 Which component of a fluorescent lamp produces most of the visible light: A. 'Mercury gas B. Electrodes . Phosphors . Sodium gas 1.2 The advantage of a point source is: A. Better colorrendering B Lower lamp lumen depreciation factor Easier to control the light distribution D. Greater efficacy 1.3 A continuous spectral power distribution curve that peaks at the long wavelength end of the visible spectrum is: A. Cold cathode Incandescent . Fluorescent D. HID 1.4 Which of the following light loss factors does NOT apply to the direct component: Luminaire ambient temperature Luminaire' dirt depreciation Lamp lumen depreciation Room surface dirt depreciation We» U’I One basic assumption of the Inverse Square Law is that the shape of the source is best represented by: A circle A line A plane A point CUE}? H O\ The shortest wavelength of the visible spectrum is perceived as: .‘. Yellow » Violet C. Red D. Green 1.7 Selecting yellow-green as the color for fire engines is based upon the: . Spectral power distribution curve of the source . Pukinje shift Photopic sensitivity curve . Scotopic- sensitivity curve C? @8 At long wavelengths, the eye perceives light to be: . Red B. Green C. Blue D. White 1.9 If a source emits all wavelengths of the visible spectrum at approximately equal power levels, the eye perceives this light as: A. Red B. Green C. Blue White 1 .10 Which of the following is a CIE/IBSNA luminaire distribution classification category? 611? Semi-indirect . Concentrating C. Forward throw D. Wall wash 1.11 A ray of incident light being reflected in one distinct direction is representative of what type of reflection: A. Spread ._ Diffuse C Specular . Semi-specular 1.12 The stimulus. in the luminous environment is: A Light reflected (or transmitted) from an object or surface The human eye C. Light absorbed by an object or surface D. The human brain 1.13 Given a coefficient of utilization for a room of .54, a maintenance factor of .8, and a typical four lamp luminaire with 2900 lumens/lamp, how many luminaires are needed to provide an average of 50 footcandles if the room size is 10ng 100 feet? A. 10luminaires {UMlMCJf/J : » ‘ ( (0(0231‘43 -B. 301uminaires I , ., c. 601uminaires ( C ck) (LL/(5) ("La 6.7)CLF) (.SW) (.8 ‘ ’4 (£20 g 100 luminaires 1.14 lamp emits visible light at wavelengths of405, 435 and 545 nm. Which color will be especially poorly rendered under the light of such a lamp? A. Violet B. .Blue . Green D Red - l 1.15 To achieve the subjective impression of “spaciousness”, the lighting should be: A. Bright and uniform with littlepcripheral lighting Uniform in distribution with some peripheral lighting C. Non-uniform with direct light from overhead ‘ D. At low illuminance with some areas of brightness at the periphery 1.16 The change in direction of a ray of light as it passes between media of different density is called: A. Reflection Refraction . Luminescence D. Insolation 2.0 Short Answer Questidns: I 2.1 List two advantages and two disadvantages of incandescent lamps (4 points). U535, 945%- “ . W‘M 9: ' . D; ' ' 2.4 List three classifications of luminaires according to their distribution pattern (3 points). ) eumrgitwafl . MLWKL/ Mina/Ii, 2.5 Why are systems that use indirect luminaires generally the least efficient (W036 I, .r r _ r . ' 56W“ W I MW at wax/9441 W (hit/km?) V 2.6 What is the spacing criterion (1 point)? Wyn/Ma 5 Ip AIM/V13 2.7 What is the significance of the spacing criterion (1 point)? It Binge/141a uu~:v‘ltb’t—é;xvi_m yn/ "fimlt—j . 2.8 What is the shielding angle (1 point)? N ‘ ._ fig/Wk W Min»? Viiiézd _ 2.9 What are recoverable light loss factors (do not list them, tell me what the term rneans) (1 point)? V (wy ‘ Mi ,wwwaj/ t wwi’f/V’VQ—t" > 2.1 Why is it necessary to calculate an effective reflectance value for the ceiling cavity when luminaries V suspended below the ceiling plane arg used ('1 point)? ‘ y K M «bi/w VIM/Vt \Li» 30 P 51 W’éfi‘Wf) W “(7') ‘ ‘21; " .- j ( ~ ‘ I ‘ 2.11 .How does electric lighting affect the'air conditioning in a build' g (1 point)? i 2.12 What is the difference between perceived brightness and luminance (1 point)? i ‘ " ‘9’“: t We fl gWW 2.14 What does the coefficient of utilization represent (1 point)? Prue vf" C (; WV ,., . . . NW wamfiam Ap- €43,» 2.15 What are the SI and Imperial units for photometric brightness (1 point)? c/c/k/ M 7/ 55L P“? L V\ 1 ‘ 2.16 What does the effective ceiling L:a/véiity reflectance represent (1 point)? LQflM/ KIM/w! / (91. j; . i ' I .1 ' i It?) . _ . . ' —. I 2.17 What is' illuminance (1 point)? .«v 2.18 Why is it necessary to include the light loss factor in the calculations for the required number of luminaries (1 point)? e... ‘ , ,_ w ) x W . vw W ZLLUMR/QLV16g 2.19 What are the SI and Imperial units for illuminance (1 point)? 1 MI AWL?” 2.20 Differentiate between recoverable and nonrecoverable light 1055 factors (1 point)? ~ 2.21 Why is color rendering important in health care applications (1 point)? K K \ ‘ - \— l i ‘ AW )WWM/M 4 8 ‘K U 1 \Lp P Mama/e 5 i g . 2.22 In a museum application, why is illuminance X hours a concern (1 point)? ~ it; inth @«M - [AM/U (we... can (Lg/v1 27 (Vb/nu, (fave/it I _ I -. C. [Mg ‘1 ~31;— WWW»; Mtpues-Nflaj - 3.0 Photometric Report Questions (to receive full credit, you. must show all appropriate formuiae, caicuiations, and answer): The following questions refer to the photometric report attached to the end of the test 3.1 Describe the luminaire mounting condition (1 point)? tame/t 3.2 What is the iuminaire type, according to the CIE-IES iuminaire classification system (1 point)? 3.3 Describe the lamps that were used in the luminaire (1 point)? [40 ’Tll M5, gig‘DW 3 .4 i What is the total lamp lumens ‘(1 point)? 3(9‘29 # ‘3 e We?) 3.5 What is the totai iuminaire efficiency (1 point)? team v4 (w ‘= 5W9? 3.6 What type of diffuser is used with this luminaire (1 point)? a? 4.0 Calculation Questions (to receive full credit, you must Show all appropriate formulae, calculations, and answer): 4.1(a) Given 25, 2000 lumen lamps, a coefficient of utilization of .40/1 ‘crht loss factor of .8, in a 200 ft2 a: 5’ ' room, what is the maintained illuminance (2 points)? ’6’ I 64 (1.5”)(W) fiwflt) @wg" «WW I" Q /' . akaW/é’t’x u 4.1(b) Suppose now that it is desired to design for an average maintained illuminance of 50 fc. How many lamps are required (3 points)? 4.2 Determine the effective cavity reflectance of the barrel vault depicted in the figure. The reflectance of the vault is 80 percent while the vertical end caps have a reflectance of 50 percent. (15 points) Solutiont The area of the vault 'If'lhe area Weighted average reflectance of the entire barrel vault cavity is r en, ' - - 4.3 A 2 x 2 fluorescent luminaire emits 3000 ed at nadir. What is the maintained illuminance at a point 12 ft directly below the luminaire. Assume the following light loss factors apply in this space (3 points): Luminaire dirt depreciation: 0.9 Lamp lumen depreciation: . 0.85 Ballast factor: 0.94 Room surface dirt depreciation: 0.95 5.0 Bonus Question (to receive full credit, you must show all appropriate formulae, calculations, and answer): 5.1 Determine the effective cavity reflectance of the entire ceiling depicted in the figure, consisting of the hemispherical dome and the flat region bounding the dome. The integrated reflectance of the dome surface is 80 percent, and that of the rectangular region bounding the dome is 70 percent (8 points). 0 egg! gileey‘mxfifl Solution: The area of a sphere is given by the relatio So the area of the dome, Ad = 27t(20)2 And the area of the opening, A0 = 1ch = Now, applying Equation 11 for the dome only, peff dome = i“ The area of the remaining rectangular region Now, applying area weighted averaging to t region yields, XYZ Photometric Laboratories Cerlified Test Program Compmed by XYZ program Report no; ABC Company. 00001 Prepared lor ABC Company Catalog no; AECODDOU Luminalre: Fabricated metal housing. white painted reflemor. specular parabolic louver Lamps: Three F4DT12/CW. each rated 3150 lumens Ballasts: One XOOG. one CDE X0032 Mounting: Recessed Lumen to candela ratio used = 9.17 Tolal input watts = 131.1 31 120.0 volts The Megree plane is parallel with the lamps Candela Dlstrlbutlon Flux 0.0 22.5 45.0 67.5 90.0 0 2875 2576 2876 2876 2876 . S 2875 2887 2899 2919 2915 278 15 2739 2831 2982 3102 3122 844 25 2485 2700 3197 3703 3767 1462 35 2150 2532 3074 2939 2835 1706 45 1545 1987 1688 1302 1290 1208 55 24 108 295 159 120 214 65 0 0 0 0 0 0 75 0 0 O 0 0 0 85 0 D - 0 0 0 D 90 0 0 0 0 0 Zonal Lumen Summary Zone Lumens , % Lamp "1. let 0- 30 2584 27.3 45.2 0— 40 4290 45.4 75-1 0-— 60 5711 60.4 100.0 0— 90 5711 r 60.4 100.0 90—180 0 0.0 0.0 0—180 5711 60.4 100.0 \ Total luminaire efliciency = ~ . Tolalrrefleclance ol pa‘rm: 91.3% x — Plane : _ Meg all—deg . Spacing crl'leria 2 1.2 1.4 \ Luminance data 'm candelas per square meter . . .. .. .. .j. _.._-._Au9l§_,&Er.ese_Averageévemse . , 0-029 Luminance data In candelas per square meter I Angle Average Average Average ' g in deg 0-deg 45-deg ell-deg . - - D - 45 3240. 3535 2700 _ 55 so 760 310 65 - 0 0 0 75 _ 0 0 0 85 0 0 0 ...
View Full Document

Page1 / 11

Fall 2006 - 1.0 Multiple Choice Questions (I point each):...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online