Related Questions

According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to
A Absolute temperature
B Square of temperature
C Fourth power of absolute temperature
D Fourth power of temperature
According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the
A Absolute temperature
B Square of the absolute temperature
C Cube of the absolute temperature
D Fourth power of the absolute temperature
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
Stefan's law describes the mass transfer by
A Diffusion
B Bulk flow
C Both A & B
D Neither A nor B
According to Stefan's law, the total radiation from a black body per second per unit area is proportional to
A Absolute temperature
B T2
C T5
D T
Stefan-Boltzman law applies to __________ body.
A Black
B White
C Grey
D Any colour
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
A Increases
B Decreases
C Remains constant
D Passes through a maxima
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
A Finned tube heat exchanger with air inside and steam outside
B Finned tube heat exchanger with air outside and steam inside
C Shell and tube heat exchanger with air inside tubes and steam on shell side
D Shell and tube heat exchanger with air on shell side and steam inside tubes
The value of Stefan-Boltazman constant in SI unit is
A 5.6697 × 10-8 W/m2.°K4
B 0.1714 × 10-8 W/m2.°K4
C 5.6697 × 10-8 kcal/m2.°K4
D 0.1714 × 10-8 kcal/m2.°K4

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