MCQs: Stefan-Boltzmann law states that the energy radiated per unit area per unit time by the black body is
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MCQs: Which among the following sentences are correct for Stefan-Boltzmann law? (1) The Stefan-Boltzmann law gives the total emissive power of a black body. (2) The Stefan-Boltzmann law is based on quantum theory (3) The Stefan-Boltzmann law does not provide distribution of energy among different wavelengths
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MCQs: The relation derived for the total emissive power of the black body as a function of wavelength and based of quantum theory is known as
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MCQs: Which of the following is/are example/s of pool boiling?
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MCQs: In pool boiling, as soon as the temperature of heating surface reaches the boiling point of the liquid, heat transfer takes place
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MCQs: In pool boiling process, the region after the natural convection in which the vapour bubbles form with increase in heat flux, is called as
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MCQs: When the formation of bubbles becomes very high in pool boiling, then the heat flux
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MCQs: What is critical heat flux in boiling heat transfer process?
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MCQs: Consider the heat is transferred through a wall of surface area A and thickness t at the rate of q, what is the thermal resistance of the system? The thermal conductivity of the wall is k and the heat is transferred normal to the surface area A.
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MCQs: The potential difference in an electrical system, is analogously considered as
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MCQs: What is the correct formula for the rate of heat transfer (q) through a plane wall of thickness l and surface are A, when temperature difference between two surfaces is ΔT ? The thermal conductivity is k.
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MCQs: Thermal conductivity of the same material varies with
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MCQs: How does the thermal conductivity of a material change with respect to change in temperature of the same material?
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MCQs: What does a composite wall mean?
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MCQs: When a composite wall of three layers in series having thermal resistances R1, R2 and R3 respectively, the heat transfer takes place normal to the surface of the layers. How is the total thermal resistance of the composite system calculated?
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MCQs: Why is the Buckingham π–Theorem used?
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MCQs: According to the Buckingham π–Theorem, the number of independent dimensionless groups, formed by combining the physical variables of a problem, is equal to
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MCQs: Which of the following dimensions is/are primary dimension/s?
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MCQs: What is the formula for Reynolds number (Re)? Where, ρ = density of the fluid μ = viscosity of the fluid D = tube diameter through which fluid is flowing v = velocity of the fluid
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MCQs: The principle of similarity or model law states that
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