quiz lesson 6

# Fill energy efficient bulbs

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Unformatted text preview: orrect B ) FALSE For a CFL, initial cost may be high but the energy costs will be low over its life time. Higher Wattage bulbs are less efficient than lower Wattage bulbs. Correct B ) FALSE Higher wattage bulbs have higher efficiency compared to lower wattage bulbs The luminous efficacy of a tungsten lamp is about 12 lumens/watt. What is the efficacy of a fluorescent tube (in lumens/watt)? Correct B ) 50 luminous efficacy of fluorescent tube is typically 3- 4 times more than tungsten lamp Filaments in fluorescent bulbs are made of tungsten. Correct B ) FALSE There is no filament in Fluorescent bulb A 30 watt compact fluorescent lamp (CFL) produces 1839 lumens of light. What is the efficacy of the CFL (in lumens/watt)? Correct A ) 61.3 Efficacy = 1839/30 = 61.3 lumens/watt A 27 watt compact fluorescent lamp produces 1531 lumens of light. What is the efficacy of the CFL (in lumens/watt)? Correct A ) 56.7 lumens/watt Efficacy = 1531/27 = 56.7 lumens/watt Fluorescent bulbs ultimately give out UV light. Correct B ) FALSE Fluorescent bulbs convert UV to visible light Incandescent lights operate at the same wattage as fluorescent lights to give out the same amount of light. Correct B ) FALSE Incandescent lights operate at a much higher wattage than fluorescent lights to give the same amount of light output A 100 watt incandescent light bulb is operated for 12 hours, and a 15 watt fluorescent light bulb is operated for the same period of time. At 10 cents per kWh, what is the cost savings of the fluorescent bulb? (1 point) Correct B ) 0.1 Incandescent light bulb: Energy consumed = 100 / 1000 x 12 = 1.2 kWh Energy cost = 1.2 x 10 / 100 = \$0.12 Fluorescent light bulb: Energy consumed = 15 / 1000 x 12 = 0.18 kWh Energy cost = 0.18 x 10 / 100 = \$0.018 Cost Savings = 0.12 - 0.018 = \$0.102 Which of the following is not a factor affecting the number of lamps required? Correct E ) # of people in the room Fixture efficiency, lamp lumen output, room size and shape, availability of natural light are...
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## This note was uploaded on 09/24/2013 for the course EGEE 102 taught by Professor Pisupati,sarmave during the Spring '07 term at Penn State.

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