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Fall 2005 - I Muitiple Choice Questions One point each...

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Unformatted text preview: I. Muitiple Choice Questions: One point each. Circle the letter of the best answer. 1.1 The age of a worker has a bearing on the preferred: @_ Lighting level . Luminance distribution C. Color rendering D. Depth of shadow 2 Ultraviolet radiation roughly occupies the wavelengths between: 100 and 380 11111 B. 380 and 780 nm C. 500 and 600 nm D. 780 and 2000 nm 1.3 The advantage of a point source is: A. Better color rendering . Lower lamp lumen depreciation factor Easier to control the light distribution . Greater efficacy 1.4 A piece of glass which, when hit by a beam of light under specific conditions, shows a transmittance of 0.7 and an absorptance of 0.1, will reflect fiom its surface: 0% Bu} 20% . 50% D. 75% 1.5 A lamp emits visible light at wavelengths of 405, 435 and 545 um. Which color will be particularly poorly rendered under the light of such a lamp: A. Violet ' B. Blue Green Red _ 1.6 Which lighting parameter is most closely related to the visual sensation perceived by the human eye: A. Luminous flux » B. Luminous intemsity ‘ Illuminance D Luminance 1.7 A' lamp emitting a total luminous flux of 50 lm is fitted in a reflector so that 40% of the light from the lamp fills onapaintingwithdnnensions of25 cmx 50 cm. Whatisthe average iBuminaneeonthe surface fthe painting? 1601117: B. 160 ft: C. 16 lux D. 16 ft: Tungsten halogen ; . High pressure sodium lamp C.‘ Mercury vapor D. Metai halide 1, Which of the following is NOT a high intensity discharge lamp: AE 3200 -— Lighting Fundamentals 1.9 The task of good fighting can best be described as: ...- Providing uniform illuminances /B Creating a good luminous environment _ C. Keeping energy costs to a minimum ’ D. Avoiding glare _1 40 The value that-represents the coolest color temperature is: (A) 4100 K B. 3500 K C. 3000K D. 1800 K 1.11 The luminance of a surface will depend on: A Illuminance . Reflectance C... Illuminance and reflectance . Adaptation luminance of the eye 1.12 Operating an incandescent lamp below its rated voltage will: A. Shorten life B. Consume more energy C. Result in a quicker restn'ke @ Cause it to emit less light 1.13 The high intensity discharge source with the longest re-strike time is: A. High pressure sodium B. Mercury vapor © Metal halide D. Fluorescent 1.14 In an enclosed fluorescent 4-lamp luminaire, the ambient operating temperature is approximately 100 degrees F. Of the following, which changewill not improve overall efficiency: A. Replacingan energymvingbaflastwithanelech‘ordc ballast B. Relamping with energy saving lamps . Changing the color temperature from 4100K to 3000K D. Replacing a standard ballast with an energy saving type 1.15 In’general, whichofthe fofiowhrgisanadvantageefmemlhalidelanmswhencompmedtomcwy vapor Imps? A. Lower efficacy B. Smaller size ~ . Better color rendition a Faster starting and resn'ik .' Larger size I . isused toqnantifythe . 1.16 Color temperature, measured in units of A. Unitless, color appearance of light sources B ‘ Kelvin, color appearance of light sources . Celsius, surface temperature of the lamp wall D. Kelvin, surface temperature of the lamp wall AB 3200 — Lighting Fundamentals Page 3 of 11 1.17 Which component of a fluorescent lamp produces most of the visible light: A. Mercury gas B. Electrodes @ Phosphors D. Sodium gas 8 A piece of red—colored glass will transmit mainly: Red B. Blue C. All colors except red D. All colors except blue 1.19 A lamp with a continuous spectral power distribution curve that peaks at the long. wavelength end of the visible spectrum is a: ' . Cold cathode B Incandescent ’ . Fluorescent D. HID 1.20 Which light source emits infrared radiation: A Low pressure sodium B. Mercury vapour Incandescent . High presure sodium 1.21 Contrast is defined as the magnitude of the luminance difierence between an object and its background divided by the; WA. Object luminance (I B) Background luminance Object illuminance D. Background flluminance 1.22 What is the annual energy cost for the following lighting system: Watts per luminaire = 109 Operating Hours per year = 3500 hours Number oflurninaires = 100 Local energy rate = $0.08 per kWh System power factor = 0.90 A. $275 $2,747 ' ' . $3,052 D. $3,391 1.23 Which of the following light loss factors does NOT apply to the direct component A. Lmrn'nairc ambient temperature B. Luminaire dirt depreciation '4,_ Lamp lumen depreciation ' D. Room surface dirt depreciation Pageél- of 11 AE 3200 — Lighting Fundamentals 2. Short Answer Questions: have high CRI’ s and the space they will be used has daylighting integrated with the electric lighting. Which would you select and why? (2 points). stair. WW 2% low sic/raw 5%ng art/{j bf“? Mum/«:25 ' I LJ’»’~<//:—r’A/-, “it“? 501 Mid " 9r 2.1 Color is a priority. Three fluorescent lamps, 3000K, 3500K and 4100K are being considered. Thay all %, 2. 2 List four factors at c Iffect visibility? (4 points) st-r-V 041915 L/ Uta/1 1. influx/K4 0i” ”344M A260 Cilfi’VKA/afl {; TM V W €12.75? WWW JV‘V‘ i AVE/vii” 2. 3 Why is it necessary to include the light loss factor in the calculations for the required number of luminaires? (2 points) MO kA;WMM¢—r—JA/\A;/r (/2 UM! W:’1/\(y (Wt/be “(Ya/2,34- I’t‘ Ar /(}/Q/ /t" £4 {rue or False Questions (Put a check mark in the correct column) (13 points) Question , True also 1. The light output from a fluorescent lamp is temperature sensitive. 2. Thermal characteristics of a luminaire will affect the output of fluorescent lam s. 3. Tungsten—halogen lamps have a shorter life than incandescent lamps. 4. Compact fluorescent lamps are suitable replacements for exterior incandescent lamps in Nebraska 5. Vertical surface lighting has a significant impact on one’s impression of a space. 6. The exterior bulb of an incandescent lamp is made of quartz glass. 7. The light output from an incandescent lamp is temperature sensitive. 8. High pressure sodium lamps would be good sources for retail display lighting. 9. Standard incandescent lamps are designated as “A” lamps. 10. Efiicacy is the most important factor in selecting a light source 11. Perceived brightness is a measurable quantity of light reflected from objects. 12. Lighting calculations are the most important part of lighting design. 13. Lighting design is a strictly linear process. ‘5 .er 2.5 What purpose is served by the base of a lamp? (2 points) 1 [A/‘g/(yéfimfl/HJQP ei’ é, GYM /(/~/«-- -4 Jim} N QC”? Page 5 ofll 2.6 When will the effective and actual ceiling reflectances be the same? (1 point) l/wvu. when he (lac? v’t419w’v J i ? [/VQA'K (fl-l l fill/l" w/é/t/an 2.7 Explain what is meant by the color temperature of a light source. What scale is used and how is that scale interpreted as color? Give one example of a low color temperature and one example of a high color temperature (4 points). gauche/cm! O l/(M/r’? {:51} (4/). Wm/mnrvci L/i (QM/14M: ”W $02M“); “'7 M C. ~ m . lr’A/v \/V’J”’¢’V?Uv4r‘r‘ia’ if Jar/£11m {/{4/ i/f/M/ELI’ N “m/ “Z +‘ kw /( VV\ [a 1%;th . Q L10” vu (Le/(cw \if/t/t/Yi.2§1aw9 (K 2'8 Defines“ “fthemowingr (3 points). lvvle ’\ 9 M; I( (Ail/0“"! Term Luminous Intensity Luminous Flux llluminance AE 3200 — Lighting Fundamentals Page 6 of 11 O 2.10 What construction characteristics of a tungsten- halogen lamp permits it to have a longer life than a standard incandescent lamp. Describe themechamsmhgéwhleh-lfi is increased (3 points)? fi/vfiW ' dbl/{WW W 5L;jj4gxlf%/W1/Kvefi=7 /L/\/P(l ‘ 3% f\/\M ‘30 [a p (“i/W. lax/z e/flixaax/t/M. 2.12 What are non—recoverable light loss factors (do not list them, tell me What the term means) (1 point)? N ©1¥ ’WQ’vJ/M 61L (bug ""CX CO § § .2 7c/z.»’t/‘¢"5 @JLL "_, . A .g/fl/K (Al’wqu/kfliewfif (ii/wait /L€/’(/(J\/[L»( GK) 6’: Lit/K :ltz/V/S $/\/p Jflé/p/\f\ F/\,A7(I (gilt/aka?! (m . fl" 2.13 ephotoreceptors in the eye are called W1! 1; and _t/4;9_V__\/(LL_ (2 points). M410,“ ’4.“ 2 14 What IS the physmal meamng of the configuration factor? (3 points) / /fi ’l" w . W / C“. (D) ELPCL mm 0 7 £3 E} A V ML 54 \' W WM W ()0 WM 65%?“ ‘ V} «XL A glam/Jig ‘AE 3200 - Lighting Fundamentals Page 7 of 11 62W 'V“ 3. Calculation Questions: To receive full credit, you must show appropriate fonnulae, calculations and answer. ‘ 3 .1 A point source has following luminous intensity dishibution: ‘ intensity Anmem (ed) 900 0 1548 5 1548 - W10 1524 “155 1484 20 1431 —————.]———-_._l 25 1362_____l 30 1283 L______________.—___ 35 1181 40 1065 45 945 50 809 55 >672 60 535 65 401 70 The luminaire is tilted 30°. Calculate the illuminance at points A and B (3 points each). ”Mixwémlwwaqaao(oaom :7 kw>ic%@ $53 _ ”2,é5 PomtB V (:1, [2:1 mun/1.8556:— q, 1 Lfflpr’, g0 0:. {3-5: {1; = “l gno U ~ may CD ‘31: ,4; AE3200 — Lighting Fundamentals Page 8 of ll «4‘47; 3.2 A point source emits 1000 lumens uniformly. ©=1000 1m A: What is the average luminous intensity from the source? (3 points). \} yf) , 300-32 [M , 6/ 5"" ”€77 {1‘ 'B: What is the illuminance at point P? (3 points). (5 A, : wé '65 17634;).[055' £06) :a O D; ' (6/gtv\'%g‘932’ ‘ AE 3200 — Lighting Fundamentals Page 9 of 11 3.3 If the configuration factor fiom the ceiling to the point is 0.3, and the configuration factor from the floor to the point is 0.55, what is the configuration factor from the walls to the point? (2 points). AE 3200 — Lighting Fundamentals Page 10 of ll ‘ The questions on this page refer to the photometric report attached at the end of the exam. 3.4 Describe the lumihaire mounting condition (1 point). 3.5 What is the luminaire type, according to the CIE-IESNA luminane candlepower distribution classification system (1 point)? f' D W}? 0 3.6 Describe the lamps used in the luminaire (2 points). (A) 3 Pet L9 "172 (724/ {2) Pl MSW Lea WW ”tuC/WCW [-s’“ Aug/Em 3.7 What are (the total lamp lumens (2 points)? ». *{gzg EM) 9? 3 (Lei/VS *- 91%;?) ["M‘L‘Aé lé’M/Vb" Q Q I 3.8 What is the total luminaire efficiency? Show calculations and answer (3 points). AE 3200 — Lighting Fundamentals Page 11 of 11 XYZ Photometric Laboratories CertifiedTesi Program Computed by XYZ program Report no; ABC Company: 00001 Prepared for ABC Company Catalog no; ABCDOOOD Lumlnaire: Fabricated metal housing, white painted reflector. specular parabolic louver Lamps: Three F40T12ICW, each rated 3150 lumens Ballasts: One X000, one-ODE X003Z Mounting: Recessed Lumen to mandala ratio used = 9.17 Total input watts = 131.1 at 120.0 volts The 0-degree plane is parallel with the lamps Candela Distrlbution. . Flux 0.0 22.5 45.0 67.5 90.0 o 2870 2876 2376 2876 2876 5 2875 2837 2699 2919 2915 278 15 2739 2831 ’2982 3102 3122 .344 25 2485 2700 3197 3703 3757 1462 35 2150 2532 3074 2939 , 2835 ' 1706 ,45 - 1545 1987 1688 1302 1290 1208 55 - 24 106 295 159 120 214 65 0 0 0 0 0 0 75 0 0 0 0. 0 0 85 0 0 ' 0 O 0 0 90 0 0 0 0 0 l Zonal Lumen Summary . ‘ Zone Lumens . % Lamp °/= Fun 0— 30 2584 27.3 , 45.2 0- 40 4290 45.4‘ 75.1 0— 60 5711 ' 60.4 100.0 0— 90 5711 50.4 100.0 901-180 0 0.0 0.0 0—.'130 5.11 60.4 100.0 Total luminalra efficiency =1 M g Total reflectance of palnt = 91.3% Legend ClE type —- O-deg: --------- Plane : _ O-deg 90—deg 45—deg: -— — — Spacing criteria : 1.2 1.4 904199! ——-—- Luminance data In candeles per Square meter ' .. ....._.........!.’:'.1£l!§_.‘l“1!:03.09~ .5!§!§9§..AY9F399 . ’ , . ' ill-deg Luminance data rn candelas per square meter 2:23 Angle Average Average 'Average ' g ' in deg D-de'g 45-deg .QD-deg . o 45 3240 3535 2700 55 ‘60- 760 310 . > as , o 0 1 0 ~ 75 . , 'o o ,. o- 85 0 ‘0 _ 0 ...
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