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Renewable Energy Practice Test: Hourly Global, Diffuse and Beam Radiations
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The solar radiation that reaches the Earth's surface without being diffused is called direct beam solar radiation. The sum of the diffuse and direct solar radiation is called global solar radiation. Atmospheric conditions can reduce direct beam radiation by 10% on clear, dry days and by 100% during thick, cloudy days.

Renewable Energy Practice Test: Hourly Global, Diffuse and Beam Radiations
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15 Questions

1. Which of the following is not used to calculate hourly radiation?
2. Which of the following can be used to estimate beam radiation?
3. The clearness index is a measure of atmospheric effects in an isolated place.
4. Which of the following is required as a parameter in a parametric model?
5. Which of the following is an example of parametric model used to compute diffuse radiation?
6. What are the two models used to determine diffuse radiation?
7. What is zenith angle?
8. Nijegorodov’s model revised the constants of ASHRAE’s model.
9. Which of the following is generally used to compute global and diffuse radiation values?
10. Solar radiation on a horizontal surface is the summation of _______
11. Decomposition models are based on correlation between ____________
12. Which of the following does the correlation of decomposition models (between diffuse and total radiation on horizontal surface) depend on?
13. Which of the following is generally used to compute global and diffuse radiation values?
14. Why are global and diffuse radiation values not measured?
15. Hourly radiation values can be used to evaluate the performance of ________

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