Q. According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a
✅ Correct Answer: (D)
black body
Heat Transfer MCQs | Page - 2
Dear candidates you will find MCQ questions of Heat Transfer here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Q. According to Prevost theory of heat exchange
✅ Correct Answer: (C)
all bodies above absolute zero emit radiation
Q. According to Stefan's law, the total radiation from a black body per second per unit area is proportional to
✅ Correct Answer: (D)
T
Q. According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to
✅ Correct Answer: (C)
fourth power of absolute temperature
Q. According to Wien's law, the wavelength corresponding to maximum energy is proportion to
✅ Correct Answer: (A)
absolute temperature (T)
Q. Cork is a good insulator because it has
✅ Correct Answer: (D)
porous body
Q. Depending on the radiating properties, a body will be black when
✅ Correct Answer: (A)
p = 0, x = 0 and a = 1
Q. Depending on the radiating properties, a body will be opaque when
✅ Correct Answer: (D)
x – 0, a + p = 1
Q. 200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)
✅ Correct Answer: (C)
0.1
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