The sun is expected to shine for at least
 1 billion years
 3 billion years
 *5 billion years
 10 billion years
 20 billion years

America's first solar-energy subdivision was built in
 Florida.
 Texas.
 New Mexico.
 Arizona.
 *California.

In some areas of the strongest sunlight in the United States, incident solar radiation amounts to about
 50 watts per square meter.
 100 watts per square meter.
 150 watts per square meter.
 200 watts per square meter.
 *250 watts per square meter.

Commercial solar cells convert about __?__ percent of the incident solar radiation to electrical power.
 5
 10
 15
 *20
 25

Each Fesnel-lens solar concentrator array deployed near the Phoenix airport produces
 *2.8 kilowatts of electrical power.
 4.6 kilowatts of electrical power.
 6.4 kilowatts of electrical power.
 8.0 kilowatts of electrical power.
 12.5 kilowatts of electrical power.

The black receiver for the solar-power tower in California's Mojave Desert is perched atop a
 100-foot tall steel tower. 
 200-foot tall steel tower.
 *300-foot tall steel tower.
 400-foot tall steel tower.
 500-foot tall steel tower.

The area of the heliostat field surrounding the solar-power tower is
 35 acres.
 *72 acres.
 114 acres.
 228 acres.
 386 acres.

The demineralized water that is pumped through the nickel-alloy tubes in the receiver at the solar-powered tower flashes into steam at a temperature of
 320¡F
 440¡F
 580¡F
 720¡F
 *960¡F 

The Georgia's knitwear plant's five-acre solar-collector field is occupied by 114
 flat-plate collectors.
 heliostats.
 parabolic troughs.
 *parabolic dishes.
 none of the above.

The thermal storage tank at the Georgia knitwear plant is filled with
 sand.
 gravel.
 *rocks.
 bricks.
 cast iron.

The solar-collector field at the deep-well irrigation project in Arizona is occupied by 23,000 square feet of
 flat-plate collectors.
 heliostats
 *parabolic troughs.
 parabolic dishes.
 none of the above.

The thermal storage tank at the deep-well irrigation project in Arizona holds
 lead shot.
 glass marbles.
 fresh water.
 brine.
 *oil.

The organic working fluid "toluene" is boiled in a heat exchanger at a temperature of about ___?___ at the deep-well irrigation project in Arizona.
 400¡F
 *515¡F
 635¡F
 720¡F
 845¡F

If the wind velocity increases from 10mph (with a power generation of 50 watts per square meter) to 20mph, the wind-power generation at the higher wind speed is
 100 watts per square meter.
 200 watts per square meter.
 300 watts per square meter.
 *400 watts per square meter.
 600 watts per square meter.

A 63-foot by 42-foot vertical-axis Darrieus wind turbine can produce nearly _____?_____ kilowatt hours of energy per year in the Texas panhandle.
 20,000
 40,000
 60,000
 80,000
 *100,000

The rotors on the large horizontal-axis windmills in the state of Washington are
 200 feet long.
 250 feet long.
 *300 feet long.
 350 feet long.
 400 feet long.

At full power, or 2 1/2 megawatts, the rotors on the large horizontal-axis windmills in the state of Washington turn at
 12 1/2 rpm.
 *17 1/2 rpm.
 24 1/2 rpm.
 32 1/2 rpm.
 38 1/2 rpm.

The tip sections of the rotors on the large horizontal-axis windmills in the state of Washington are completely feathered when the wind blows
 40mph.
 *45mph.
 50mph.
 55mph.
 60mph.

The greenhouse complex in California that is heated by geothermal well water covers an area in excess of
 *two acres.
 three acres.
 four  acres.
 five acres.
 six acres.

The greenhouse in Oregon that is heated by geothermal well water employs
 a forced air heating system.
 an iron radiator heating system.
 *a finned tube heating system.
 a radiant slab heating system.
 none of the above.

The geothermal well water used in the alcohol plant in Nevada comes out of the earth at a temperature of
 180¡F.
 *220¡F.
 260¡F.
 300¡F.
 340¡F.

The dried and concentrated by-products of the distiller's dried grain from the geothermal alcohol plant in Nevada contains about
 15 percent protein.
 20 percent protein.
 25 percent protein.
 *30 percent protein.
 35 percent protein.

The geothermal well water, after passing through the heat exchanger in the alcohol plant in Nevada, is then
 sold as mineral water.
 piped to a health spa.
 injected into a shallow aquifer.
 discharged into a river.
 *discharged into a marsh.

The organic working fluid in the binary-cycle geothermal power plant in Idaho is
 propane.
 butane.
 *isobutane.
 pentane.
 ethane.

During the winter months, the 60 Hz generator at the binary-cycle geothermal power plant in Idaho is capable of generating
 6 megawatts.
 *6 1/2 megawatts.
 7 megawatts.
 7 1/2 megawatts.
 8 megawatts.