Q. Which of the following is/are known as selective absorbers?

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Q. Which layers participated in the process of thermal radiation through solids and liquids?

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Q. Some of the gases have low emissive power and absorptivity. They are considered practically diathermanous. Which of the following option is true?

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Q. Consider a beam of monochromatic radiation at wavelength λ that enters a layer of absorbing gas. As the beam passes through the gas layer, its intensity

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Q. When a gas or vapor is in the process of oxidation and combustion, it is called as

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Q. The monochromatic absorption coefficient depends upon

(i) Temperature

(ii) Time

(iii) Pressure

(iv) Wavelength

Identify the correct option

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Q. Which one of the following is not extremely inert to thermal radiation?

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Q. Consider a beam of monochromatic radiation at wavelength λ that enters a layer of absorbing gas. As the beam passes through the gas layer, its intensity is given by

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Q. Which one is having highest value of fouling factor?

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Q. What is the value of fouling factor for sea water?

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Q. What is the value of fouling factor for clean river?

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Q. Which one is having lowest value of fouling factor?

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Q. What is the value of fouling factor for treated boiler feed water?

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Q. What is the value of fouling factor for fuel oil?

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Q. What is the value of fouling factor for oil bearing steam?

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Q. What is the symbol used for mass?

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Q. What is the symbol used for length?

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Q. What is the symbol used for time?

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Q. What is the symbol used for gravity?

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Q. What is the symbol used for dynamic viscosity?

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