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Heat Transfer

Heat Transfer
In forced convection, the heat transfer depends on

mainly Gr
none of the listed here
Re, Gr
Re, Pr

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Heat Transfer
__________ chart is known as transient heat conduction chart.

Cox
Heisler's
Mollier's
Dirhing's

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Heat Transfer
Grashhoff number is given by

gD2βΔtP²μ
gD2βΔtρ/μ²
gD³.β.Δtρ²/μ²
gD³βΔtP²/μ

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Heat Transfer
With increase in temperature, the thermal conductivity of steel

Increases
Decreases
Increases exponentially
Remains unchanged

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Heat Transfer
A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m².K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is

0.55
555
55.5
0.15

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Heat Transfer
__________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side.

U-tube
Three pass, fixed tube sheet
Single pass, fixed tube sheet
None of these

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MORE MCQ ON Heat Transfer

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