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Heat Transfer

Heat Transfer
In a boiling curve, the peak heat flux is called the __________ point.

Leidenfrost
Burnout
Nusselt
Boiling

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Heat Transfer
Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

Graetz number > 100
Exit fluid temperature = wall temperature
Exit-fluid temperature > wall temperature
Exit fluid temperature < wall temperature

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Heat Transfer
Heat waves

Can not pass through vacuum
Can be reflected by a mirror
Travel in straight line
Both B and C

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Heat Transfer
Heat flux through several resistances in series in analogous to the current flowing through several.

none of the listed here
resistances in series
capacitors in series
resistances in parallel

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Heat Transfer
For specified tube outside diameter, higher BWG means higher

none of the listed here
tube thickness
weight per unit length
cross-sectional area

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Heat Transfer
In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms⁻². Neglecting the heat capacity of agitator, the temperature of water (in °C) is

26.8
34.4
25
40.5

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