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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Corrosive
Scaling
Salty
Highly viscous

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Heat Transfer
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when

CPA < CPB
CPA > CPB
KA>2 kB
KA < 0.5kB

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Heat Transfer
If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will

Increase by 1.8 times
Decrease by 22
Increase by 216
Remain unchanged

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Heat Transfer
For what value of Prandtl number, St = f/2?

1.5
1
2
> 1

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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

40.5
25
26.8
34.4

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Heat Transfer
With increase in temperature, the thermal conductivity of non-metallic amorphous solids

None of the listed here
decreases
increases
remains same

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