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Heat Transfer

Heat Transfer
Stefan-Boltzman law applies to __________ body

None of the listed here
white
grey
black

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Heat Transfer
'Fouling factor' used in the design of a multipass shell and tube heat exchanger is a

Conversion factor for individual film heat transfer co-efficient to overall heat transfer co-efficient
None of these
Non-dimensional factor
Factor of safety

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Heat Transfer
For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

1
1.74
6.1
37

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Heat Transfer
1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is

500
520
400
200

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Heat Transfer
Analogy between mass and heat transfer is not applicable in case of

Both B and C
Same velocity profile or equal eddy diffusivities
Thermal or pressure mass diffusion
Viscous heating or chemical reaction

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Heat Transfer
In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms⁻². Neglecting the heat capacity of agitator, the temperature of water (in °C) is

26.8
40.5
34.4
25

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