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Heat Transfer

Heat Transfer
In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

1
< 1
> 1
∞

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Heat Transfer
Which of the following has maximum thermal conductivity?

Iron
Tar
Nitrogen
Coal

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Heat Transfer
Which of the following has the minimum thermal conductivity?

Nitrogen
Tar
Steel
Carbon black

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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

37
1.74
1
6.1

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Heat Transfer
For a counter current heat exchanger with Tih = 80°C, T°c = 60°C, T°h = 50°C and Tic = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy

dT/dZ = 0
d²T/dZ² < 0
d²T/dZ² = 0
d²T/dZ² > 0

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Heat Transfer
Crystallisation of solids from a homogeneous solution is a/an __________ process.

Highly endothermic
Exothermic
Mildly endothermic
None of these

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