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Heat Transfer

Heat Transfer
Correction is applied to LMTD for __________ flow.

Cross
None of these
Parallel
Counter

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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

200
520
500
400

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Heat Transfer
Graetz number is given by

kL/mCp
kμ/mCp
mCp/kL
mCp/kμ

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Heat Transfer
In case of evaporators, liquid entrainment results primarily due to

high heat transfer rate
high heat transfer rate
high vacuum in the evaporator
foaming of the solution

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Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

894W/m².K
1200W/m².K
333W/m².K
287 W/m².K

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Heat Transfer
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Exit-fluid temperature > wall temperature
Exit fluid temperature = wall temperature
Exit fluid temperature < wall temperature
Graetz number > 100

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