Fall 2001 & Fall 2002

Fall 2001 & Fall 2002 - @qgtorjr 3,, At; 3355; a ....

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Unformatted text preview: @qgtorjr 3,, At; 3355; a . Fundamental Theory sf Eutldmg Illuminatien ‘ UNIVERSITY or second ln—Class Test . ~ Date: November 9“: zeal Lincoln ‘33" 1. Multiple Choice Questions: One point each. Circle the letter of the correct answer. - 1.1 What is the best description for a F32T8'iamp: A. A 32 inch long lamp ' e B. An 8 watt lamp C. A 3200K lamp @ A 1 inch diameter lamp .%x 1.2 Reflectance is denoted by the Greek letter: A. Tau (1:) Rho (p) C. M D. Phi ((1)) 1.3 Which component of a fluorescent lamp produces most of the visiblelight: A. Mercury gas - B. Electrodes Q Phosphors 7;; V i . SOdlle gas g3, 1.4 The part of the eye that bends'the light rays as they enter the eyeis: A. The ciliary muscle @ The cornea C. The pupil D. The retina 1.5 Which light source has the highest eficacy A. Mercury vapor B. Incandescent C. Tungsten halogen @ High pressure sodium 3% 1.6 The advantage of a point source is: A. Better color rendering ' B. Lower lamp lumen depreciation factor Easier to control the light distribution D. Greater efficacy 1.7 Which light source produces nearly monochromatic light: Tungsten halogen @ High presure sodium C. Metal halide D. Fluorescent ' Fundamental Theery of Building Illumination Secenal In—Class Test a Page 2 of 8 1.8 A lamp with a continuous spectral power distribution curve that peaks at the long wavelength end of the visible spectrum is a; ' A. Cold cathode ® Incandescent C. Fluorescent D HID . 1.9 To achieve the subjective impression of “spaciousness”, the lighting should be: A. Bright and uniform with little peripheral lighting @ Uniform in distribution with some peripheral lighting Non—uniform with direct light from overhead D. At low illuminance with some areas of brightness at the periphery 1.10 Operating an incandescent lamp below its rated voltage will: A. Shorten life B. Consume more energy C. Result in a quicker restrike Cause it to emit less light 1.11 In an enclosed fluorescent 4-lamp lurninaire, the ambient operating temperature is approximately 100 degrees F. Of the following, which change will not improve overall efficiency: A. Replacing an energy saving ballast with an electronic 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 . 1.12 If lamp “A” has a color temperature of 3000K and lamp “B” has a color temperature of 5000K, which 5 tement is true: a Lamp “A” appears warmer B. Lamp “A” renders color better C. Lamp “A” appears cooler 13. Lamp “B” renders color better 1.13 Which of the following characteristics of- the distribution of light from a lighting system has not been shown by research to influence subjective impressions: A.. Overhead/Peripheral Direct/Indirect C. Uniform/Nonnuiform D. Bright/Dim gig 1.14 The density of luminous flux leaving a surface is: A. Transmittance Bxitance - C. Reflectance D. Illuminance 1.15 When two colors appear identical under one illuminant, but appear different under a second illuminant, this effect is referred to as: A. Bezold effect B. Color contrast . color adapation D Metamerie match Fundamental Theory of Building Illumination Second Iii-Class Test Page 3 0f 8 fl _ I @412 ‘S’ '0 2. Discussion Questions: 2.1 Complete the blank sections of the following Table. One point per cell of the Table. Bonus points will ‘ be awarded if you include SI and English units, as appropriate. (15 points plus bonus). may . «all: WNW" " n if? 1W. PIUAC ; I’M/“\nouJ‘ " ‘ .5. ‘ ' I . A LU“. a1. /Pr1 (“A 44.2. LUmamrenoL' L l 1 N”- CA LM?‘ Lumwolw M _ _ [,W/Prz LIV/{1+1 2.2 Label each of the numbered structm'es identified on the diagram of the'human eye. (8 points) Label Number 2 dag, 2.3 What arethe purposes of a ballast (2 points)? _ p 1 Fred/«31 -SW%W v0{W 5'73“), - qu‘tffiy‘f ‘94: Mg -9vvc2 SW. fi;/- l L37? Fundamental Theory of Building Illumination Second In~Class Test Page 4 of 8 o in UL. 2.4 True or False Questions (Put a check mark in the correct column). (10 points) _ w. . __l...____..___ _n a .- 1. The 1i - ht on ut, from. a fluorescent lam is tem rature sensitive. 2. Theral characteristics of a luminaire will affect the on n ut of fluoreSCent lams. 3. Tungsten-halogen 1am s have a shorter life than incandescent lamps. ‘ 4. Compact fluorescent lamps are suitable replacements for exterior incandescent lamps in Nebraska ' 5. Vertical surface lightin has a significant imact on one’s impression of a space. 6. The exterior bulb of an incandescent lamp is made of uartz glass. . . I '- ressure sodium lams would be good sources for retail display lighting. 9. Standard incandescent lamps are designated as “A” lamps. ‘ 10. Efficacy is the most imortant factor in selectin; a light source 2.5 Ultraviolet can have good and bad effects on human health. List two good and two bad effects of ultraviolet on human health (4 points). ' Bad Effects , Life) Effis erwatt) Stag Ti(es> w- 3., K Lf V . V 1 . .Metal Halide M201. ".Fundamental Theory of Building Illumination Second In-Class Test - Page 5 of 8 ' 2.7 What construction characteristics of a tungsten-halogen lamp permit it to have a longer life than a standard incandesgt lamp? Describe the mechanism by which lamp life is increased (6 points). M {A j 4 a Wilmer ctr/i},- . a. . W] Lax, {We Wpefm‘fi d7 owe,” [ii/mfg?“ 4a @W (W W74 t. - ./lFOI/J iii/w‘ g 2.8 What are recoverable light loss factors (do not list them, tell me what the term means) (4 points). WW hr Mid MA 2.9 Explain what is meant by'the color temperature of a light source. What scale isgused, and how is that scale interpreted as color? Give one example of a low color temperature, and one example of a high color tenEaapmnW a g 0 V“. g [/24 fundamental Theory of Building Illumination Second In-Class Test _ Page 6 of 8 K % at}? 3. Photometric Reports and Calculation Questions The questions refer to the photometn'c report reproduced on the facing page. \ thhevluminaire tnounting condition (1 point)? I 33.2] What the luminaire-type, according to the CIE-IES lunfinaire candlepower dism‘bution classification syStem (1 point)? i l x 3.3 Descrle the lamps that were used in the luminaite (2 points). ' 340 T‘Z CM( Whlh (W5 3i l “W . 3.4 What is the total lamp lumens (2 points)? 7715:7le 3 : ‘WQO. (,pW’JMK/A 3.5 What is the total luminaire efficiency? Show} calculations and answer (3 points). . 7/ 0 A ’00:éo,é’f9 4%?) ( FM 3.6‘ What type of diffuser was used wlth this luminaire (1 point)? ‘ l l v ' M {O Fundamental Theory of Building Illumination Second In-Class Test - - ‘ - Page 7 of 8 = . 3.7 For the indi :s 'ghting fixture indicated determine {Tie initial illumination level on the ceiling at the _ points A and :@) ints). . , I" bnuldar U - g IIPEIT IUMEI: 153‘“ NYE: 3-47-30 FIO‘NIEYIIS REPORT "in!!! “I lAI. "C. “CHLOE IIIIIEI: Ham-119D SEIRS LBMIIIRE: on: H!!! IEHICTQI, SEll-SPEW'LAI fLflTED SIDES, FLAT 391"")! "MS’KIIH‘ FL“ Inlth PAIIT‘ SPECELAI HMSHUS STE! ARE I! III' NAIF!!! 56c“! HOBSIIE. LARPKS): DIE ,HUSPHDB “HID 25D IAT'T HULL HAL“! IATEDJBEMI “IRIS. MMYII‘: PEIUAET IEAI “IDLEIMEX nsnltunol CAI DLEPUVEI DIS :7 mm. FLU! fl 0 5 D I I! D 9 25 0 0 35 D o . ‘5 B d 55 fl 0 65 B D 75 u D 55 D 0 9D {9 95 :55 1!! ms 2:11 am ns mu 35:9 125 156! m: 135. 2515 m: In: 2:132 ms 155 - 1945: m ,m no; us 115 1415' 137 no : 19:5 . IDML $11le ZONE LVIEIS um F“? B- 98 0 .0 .0 90-120 ' EIIS 31.5 ‘SJ 90-1“ ’12! ".5 “.5 90-!“ 12555 61.7 “.4 93-“! “1‘8 83.! 106.0 0-3“ 1‘“! 69.! 100.0 n: 'm: Ilium tom. zmuun - as.“ flit? JMKJ- "mama-Mum's!“ mam-11man = aflowwza/ (9‘ =LS’Zbgé’ @ 1=1€w~1y=t§yo 8.1? Q _ ité’zm ; {WS'LA ' i, 3 UNIVERSITY or Lighting Fundamentals Second Iii-Class Test . Date: November 13‘“, 2002 LlDCOiIl - 1. Multiple Choice Questions: One point each. Circle the letter of the correct answer. 1.1 Which term applies to the eyes ability to see at low lighting levels: ' if It}- Photopic vision LE) Scotopic vision C. Myopia vision D. Astigmatism 1.3 Which term applies to the eyes ability to see at lighting levels that prevail outside on a sunny day: Phqtopic vision Scotopic, vision C. Myopic vision D. Astigmatism 1.4 Which of the following light loss factors does NOT apply to the direct component: A. Luminaire ambient temperature B Luminaire dirt depreciation Lamp lumen depreciation Room surface dirt depreciation 8 E) 1.5 The density of luminous flux leaving a surface is: A. Transmittance ' Exitance ' C. Reflectance D. ' Illuminance 1 . 146 Source luminance, position, size and number are all causes of: a LgEVisibi'lity ' 4 ‘ B. ngdaptation ii? I Glare D. Saccades 1.7 Contrast is defined as the magnitude of the luminance difference between an object and its background divided by the: ' A. Object luminance g L “L ‘ , g T 13 ; Background luminance : .——-———- ; Object illuminance L B t D. Background illuminance Lighting Fundamentals Second In—Class Test Page 2 of 8 2. Short Answer Questions: 2.1 Complete the blank sections of the following Table. One point per cell of the Table. (15 points). 2.2 Label each of the numbered structures identified-On the diagram of the human eye. (8 points) Label Number a? Whfiésfthgéiggeé’e?(2§?int24gfip 10W? WWW/3 mum W‘xfiY’Eigmgf. Gibb-E. igw. «Ema Q‘ v Wmflw H \3 mm “LS/rm 5‘ Labove "ME fl” - 0W Wffi WE ' (Esme mm - 2.4 What is a luminaire? (3 points) a eemgfileee w meagfél C}? G We"??? *2 a? WM +1736 «Dov dtfir “ame’é «w (term; 7‘ . - x e-m “ll-"£3 “file, ’l? msmm mm weer lrfi 4-46». mm m ea oomvxeCJ‘v F x9 g . if) mm“ -» ' v Lighting Fmgnental sag/d {eggs st Page3°f 8 3. Calculation Questions: 3.1 Name each of the three cavities defined in the zonal cavity method, and describe what area is enclosed by each respective cavity (6 points): Descrip ,, , A_ 7. bcmfifl Homologue W30 Ewtmmwe ‘p‘éfiflfi (Elia/1g ' MMW’A‘PE‘ 3.2 A 100 W point source has a rating of 1,7501umens. What is the candlepower in all directions of this point source? Show calculation formula and work (3 points). c?" 1750 lowesfii Lighting Fundamentals Second In—Class Test ‘ Page 5 0f 8 2.5 What does the coefficient of utilization represent? (3 points) 0/0 {Hi E‘iui’gi‘t‘xhi‘ti ~ . I". i again 5% ego/cm; a} ' MWW“; “ii? WE}? s‘ “it 2.6 What are the SI and Imperial units for photometric brightness? (2 points) CotoCEei a c WW1 01 mt . 2.7 What does the‘effective ceiling cavity reflectance represent? (3 points) __ A r a S . [MK {13mm . attic-r 043' {fix Wfiéfil 3‘ E (49011le {stamens . 2.8 What is illuminance‘? (2 points) flux! dengta/ 22.32. ()5. Switz’fit’fi 1mg, It?» diil‘xVCVli/ig 2. r . 2.9 Why is it necessary to include the light loss factor in the calculations for the required number of luminaires? (3 points) 4V ensure Vh’tQE’i’ll’lg [Hummmct A. 2.10 What are the SI arid Imperial units for illuminance? (2 points) «at N: v; Jar-93‘ 3 EC? '6 17w" \Utm {Vi fa Ety’if‘tétii'EE 2.11 Differentiate between recoverable and nonrecoverable light loss factors? (2 points) A teammate 9 ' g 4%.?" ' 3:": Mt batten/“‘39:; . .1 ' . so, A w .. y’lOi’YYEUJVEVQlel’fi tight [Cl/“2&3”? it? 3%, r” 2.12 What is an intensity distribution curVe? (3 points) éjmm \AQ} that to $35??? \Wmtf. ' * t”: if}? U 2.13 What is the significance of the luminane Spflci? criterion? (,2 points) 11 ON 8 ii "i i ii” 1 W: tag é??? is; 2.14 List four factors that can affect visibility? (4 points) age r 81%C‘OOFWWST3 “gm 10161. 2.15 List three factors that will affect the coefficient of utilizaton? (3 points) minim“ “70m 9%; i.» \ Lighting Fundamentals Second Iii—Class Test Page 4 of 8 J \‘i 3.3 How many luminaires are required to illuminate a 30 ft by 30 ft room so that the average maintained workplane illuminance throughout the space is 30 fc‘?~ Assume 2800 initial lumens per lamp, 2 lamps per luminajre, a coefficient of utilization of .58, and a light loss factor of 0.60. Show calculation formula and work (14 points): ,, g’lumiiifiiowwfi ‘ i, if LL? 6 "’ sziwel M??? flggrgi") (C gé mg i “x. { We [0113C U395 3‘0 x 330‘ W «mew W ii Wm: l Lighting Fundamentals Second III-Class Test Page 6 of 8 1 3.4 What is the average wall reflectance of a room measuring 20’ percent? Show all your work (6 points). \l‘ MmfiwfimfiiW “3“ Lighting Fundamentals Second In—Class Test x 30’ x 10’ whose wall reflectance is 60 percent on all four walls but has a chalkboard measuring 10’ x 5’ on one wall with a reflectance of 10 “#:2— . we"? 4. Ben as Questions: '_ . : Make sure you have completed all the earlier section: before attempting the bonus questions. I“ Name the lighting quantity associated with each definition (5 points). Time rate of the flow of light. Intensity of light in a given (specified) direction. Incident flux density. Photometric brightness. Flux density leaving a surface. 4.2 A 2 x 2 fluorescent luminaire emits 3000 candelas at nadir. What is the maintained illuminance at a point 12 ft directly below the luminaire? Assume the following light loss factors: Luminaire dirt depreciation: 0.9 :__ Lamp lumen depreciation: 0.85 "‘ "” ' " _ 1" Ballast factor: 0.94 ' Room surface dirt depreciation: 0.95 Show calculation formula and work (3 points): as?” 5 . par; gram ‘; l-w; ; r A M e l"- PM: fixes .. i ,0 “" q 4.3 What is the initial illuminance at the same point, assuming the same light loss factors. (2 points) ' V . ‘ . — 7_ A -- .~- ' ' ' " ‘3 :. - _ c-“ . * Lighting Fundamentals Second In-Class Test Page 8 of 8 ...
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This note was uploaded on 04/13/2008 for the course ENGM 223 taught by Professor Soares during the Spring '08 term at UNL.

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Fall 2001 & Fall 2002 - @qgtorjr 3,, At; 3355; a ....

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