MCQs: According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to___________________?
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MCQs: Log mean temperature difference in case of counter flow compared to parallel flow will be________________?
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MCQs: The unit of Stefan Boltzmann constant is ____________________?
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MCQs: Stefan Boltzmann law is applicable for heat transfer by __________________?
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MCQs: Thermal diffusivity of a substance is __________________?
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MCQs: The thermal diffusivities for gases are generally_____________________?
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MCQs: A grey body is one whose absorptivity _________________?
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MCQs: Planck’s law holds good for________________?
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MCQs: A perfect black body is one which_______________?
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MCQs: If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of___________________?
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MCQs: In regenerator type heat exchanger, heat transfer takes place by___________________?
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MCQs: Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by ___________________?
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MCQs: Depending on the radiating properties, body will be transparent when________________?
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MCQs: Absorptivity of a body will be equal to its emissivity___________________?
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MCQs: The amount of radiation mainly depends on___________________?
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MCQs: The ratio of the energy absorbed by the body to total energy falling on it is called_________________?
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MCQs: The emissive power of a body depends upon its___________________?
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MCQs: 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is____________________?
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MCQs: The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit_______________?
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MCQs: Depending on the radiating properties, a body will be black when_________________?
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