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Heat Transfer

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

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

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Heat Transfer
The overall resistance for heat transfer through a series of flat resistance, is the __________ of the resistances.

Sum
Product
Geometric mean
Average

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Heat Transfer
Graetz number is given by

kL/mCp
mCp/kL
mCp/kμ
kμ/mCp

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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
400
500

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Heat Transfer
Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid

for fluids in tubulent flow
none of the listed here
for fluids in laminar flow
when Grashhoff number is very important

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Heat Transfer
The purpose of providing bleed points in the evaporator is to

Create vacuum
Admit the feed
Facilitate removal of non-condensable gases
Remove the product

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MORE MCQ ON Heat Transfer

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