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Heat Transfer

Heat Transfer
Removal of __________ heat is involved in the condensation of a vapor under saturated conditions.

Super
Both B & C
Latent
Sensible

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Heat Transfer
Evaporation by thermocompression results in the

Both A and B
Realisation of multiple effect economy in a single effect
Saving of steam
None of these

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

> 1
1
1.5
2

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Heat Transfer
In a cooling tower, water becomes cool by

Loosing latent heat
Heat transfer to surroundings
Vaporisation due to heat loss to air
Loosing sensible heat

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Heat Transfer
Heat transfer rate described by Fourier's law will decrease, if the __________ increases.

Thickness
Thermal conductivity
Heat transfer area
Temperature difference

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Heat Transfer
Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

37
50
45
32

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