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Heat Transfer

Heat Transfer
The units of resistance to heat transfer is

W⁻¹m²K
J.m⁻².K⁻¹
J.m⁻¹.K⁻¹
W.m⁻².K⁻¹

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Heat Transfer
Use of transverse baffles in a shell and tube heat exchanger is done to increase the

All of these
Flow velocity
Rate of heat transfer
Turbulence of shell side fluid

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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

45
37
50
32

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Heat Transfer
Double pipe heat exchangers are used

when heat transfer area required is very low
when heat transfer area required is very high
because it occupies less floor area
because it is less costly

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

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

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Heat Transfer
With the increase of temperature, the Col-burn jH factor

May increase or decrease ; depending on temperature
Remains unchanged
Decreases
Increases

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MORE MCQ ON Heat Transfer

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