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Heat Transfer

Heat Transfer
What is the emissivity of a black body?

1
0.9
0.5

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Heat Transfer
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is

12.0 kW/m²
11.2 kW/m²
14.6 kW/m²
16.5 kW/m²

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Heat Transfer
To reduce the tube side pressure drop for the same flow rate, the heat exchanger recomended is

2-4 heat exchanger
3-2 heat exchanger
1-2 heat exchanger
1-1 heat exchanger

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Heat Transfer
The critical radius of insulation for cylindrical pipe is (where, hi = heat transfer coefficient at inside of the pipe )

2hi/K
hi/K
K/h0
2K/h0

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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

400
520
200
500

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Heat Transfer
Economy of an evaporator is influenced by the

Steam pressure
Both B & C
Feed temperature
Number of effect

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