Solar energy arrives at the outside of the earth’s atmosphere at an average rate of _________.

How many percent of solar energy survives absorption and reflection?

Which of the following solar collectors are essentially wide, flat boxes with clear plastic or glass coverings known as the glazing?

Which of the following collectors use mirrors and/or lenses to focus the suns energy on  a small absorber area.

Which of the following collectors are more complex, but their efficiencies are higher?

Which of the following collectors are useful when extremely hot transfer fluid is needed and are generally limited to commercial projects?

The shading factor in calculating the heat absorbed by the solar collector has a value of approximately:

The ratio of energy absorbed by the transfer fluid to the original incident energy striking the collector.

As the difference between the ambient air and average plate (or inlet)  temperature increases, what happens to the collector efficiency?

Distributed collector system is also known as:

Trough electric technology is relatively mature but due to the low temperatures, average annual thermal efficiencies are only:

A field of heliostats or tracking mirrors concentrates solar energy onto a receiver on a central tower

Practical and economic issues limit trough electric systems to about:

Generates a voltage from incident light, usually light in the visible region.