quiz lesson 6

# Correct a outdoor

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Unformatted text preview: orrect A ) better color rendering A higher CRI means better color rendering Which one of these methods of lighting is least efficient? Correct A ) incandescent Incandescent light bulbs are the least efficient A footcandle (fc) is the standard unit of measure for illumination on a surface. It is calculated as _____. Correct A ) fc = Lumens of Light / Area in sq. ft fc = Lumens of Light / Area in sq. ft Heather is a smart person who wants to save energy and money. So, she has replaced the 75 Watt incandescent light bulb in her house with a 13 Watt CFL bulb. The expected life of incandescent and CFL bulbs is 800 h and 8000 hours respectively. The purchase price of an incandescent bulb is \$0.53 and for the CFL it is \$4. The cost of electricity is 10 cents per kWh. What is her total savings over the life of the CFL bulb? Correct A ) 50.9 CFL energy cost for 8000 hrs = 13 / 1000 x 8000 x 10/100 = \$10.4 Total cost for CFL = 4 + 10.4 = \$14.4 Incandescent light energy cost for 8000 hrs = 75/ 1000 x 8000 x 10/100 = \$60 # of Incandescent bulbs required = 8000/800 = 10 bulbs Total cost for Incandescent light = (0.53 x 10) + 60 = \$65.3 Total Savings = 65.3- 14.4 = \$50.9 Vapors of which element are used to fill energy efficient bulbs?" Correct B ) mercury Mercury vapor is used to fill energy efficient bulbs Fluorescent bulbs are filled with _____. Correct D ) a mixture of argon- krypton gas and a small amount of mercury Fluorescent bulbs are filled with a mixture of argon- krypton gas and a small amount of mercury A 100 watt incandescent light bulb is operated for 11 hours, and a 32 watt fluorescent light bulb is operated for the same period of time. At 8 cents per kWh, what is the cost savings in using the fluorescent bulb? Correct A ) 0.06 Incandescent light bulb Energy consumed = 100/1000 x 11 = 1.1 kWh Energy Cost = 1.1 x 8/100 = \$0.088 Fluorescent light bulb Energy consumed = 32/1000 x 11 = 0.352 kWh Energy Cost = 0.352 x 8/100 = \$0.02816 Savings in Energy Cost = 0.088- 0.02816 = \$0.05984 A 30 watt compact fluo...
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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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