Q. The length of mean solar day is slowly increasing.

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Q. What is the relationship between insolation and cloud cover in sky?

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Q. Which of the following is a reason for inverse relationship between insolation and cloud cover in sky?

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Q. Which does Angstrom-Savinov formula tell?

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Q. What does the constant “k” signify in the Angstrom-Savinov formula?

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Q. The constant “k” in Angstrom-Savinov formula depends on ________

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Q. How does the constant “k” in Angstrom-Savinov vary in high and low latitudes?

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Q. Which of the following models uses linear regression to estimate solar radiation from sunshine duration?

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Q. Akinoglu and Fcevit uses a _______ to estimate solar radiation.

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Q. How is an empirical model developed?

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Q. What does the ratio of global solar radiation (H) and estimated daily global radiation for cloudless sky (H₀) indicate?

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Q. Which of the following is important during data acquisition from measuring instruments? Assume that details about data to be collected is known.

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Q. Which of the following statistical indicator is used to evaluate any type of model?

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Q. Why do ground-based observers overestimate overcast cloud cover?

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Q. Reduction of error between simulated values and the true values increases accuracy of the empirical model.

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Q. Cloud cover estimation is free from error.

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Q. Hourly radiation values can be used to evaluate the performance of ________

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Q. Why are global and diffuse radiation values not measured?

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Q. Which of the following is generally used to compute global and diffuse radiation values?

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Q. Which of the following can be used to estimate beam radiation?

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