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Heat Transfer

Heat Transfer
According to Reynolds analogy, Stanton number is equal to

f
2f
f/2
f/4

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Heat Transfer
Which has the lowest Prandtl number?

Aqueous solution
Lube oil
Liquid metal
Water

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Heat Transfer
Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.

Reynolds
Prandtl & Grashoff
Both A & B
Grashoff

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Heat Transfer
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?

> 0.6
0.5
< 0.1
< 0.5

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Heat Transfer
Electro-magnetic spectrum range, which is important for radiation varies from __________ microns.

0.5 to 50
1 to 100
100 to 1000
10 to 100

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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

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

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