Q. Which of the following is generally used as circulating fluid in tropical and sub-tropical climates?

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Q. Which of the following is generally used as circulating fluid in freezing climates?

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Q. Why are antifreeze solutions (antifreeze agents with water) used as coolants in freezing climates?

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Q. Adding antifreeze agents to water _________

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Q. Which of the following is a circulating fluid in evacuated flat-plate solar collectors?

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Q. Evacuated flat-plate solar collectors are a type of _______

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Q. Which of the following are used as absorbers in evacuated-tube solar collectors?

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Q. What is a heat pipe?

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Q. For better efficiency, solar collectors do not coat their transparent cover with an anti-reflective coating.

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Q. Evacuated tube solar collectors use a glass tube to surround absorber with high vacuum.

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Q. Which of the following is used to make a glass-glass evacuated tubes?

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Q. Which of the following is a problem with evacuated tubes?

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Q. Why does flat plate collector perceived to have higher efficiency than evacuated tube solar collector in terms of area?

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Q. _______ lose more heat to the environment than evacuated-tube solar collectors.

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Q. Which of the following are combined to form an evacuated flat plate solar collector?

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Q. Which of the following provides highest energy conversion efficiency in non-concentrating solar collectors?

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Q. What is the metal sheet absorber surrounded with in an evacuated flat plate collector?

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Q. Which of the following organisations developed first high vacuum insulation?

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Q. Why does an evacuated flat plate collector require a glass-metal seal?

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Q. Which of the following pumps is used in an evacuated-tube solar collector?

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