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Heat Transfer

Heat Transfer
Film boiling occurs at __________ pressure.

very high
none of the listed here
atmospheric
negative

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Heat Transfer
For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would

Decrease
Increase
First increase and then decrease
First decrease and then increase

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Heat Transfer
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

L
< 1
>1
0.1

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Heat Transfer
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is

16.5 kW/m²
14.6 kW/m²
12.0 kW/m²
11.2 kW/m²

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Heat Transfer
In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.

Local
Pool
Nucleate
Saturated

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Heat Transfer
If heat transfer rate varies with the time, it is termed as

Forced convection
Steady state conduction
None of these
Monochromatic radiation

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