Q. A conical cavity of base diameter 15 cm and height 20 cm has inside surface temperature 650 K. If emissivity of each surface is 0.85, determine the net radiative heat transfer from the cavity

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Q. A cylindrical cavity of base diameter 15 cm and height 20 cm has inside surface temperature 650 K. If emissivity of each surface is 0.85, determine the net radiative heat transfer from the cavity

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Q. What is the unit of coefficient of radiant heat transfer?

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Q. Which of the following have a continuous spectrum?

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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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