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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Scaling
Highly viscous
Salty
Corrosive

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Heat Transfer
Which of the following is the most widely used heat insulating material for pipelines carrying steam?

Fireclay refractory followed by aluminium sheet
85% magnesia cement and glass wool
Tar dolomite bricks followed by asbestos
Cotton followed by aluminium foil

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Heat Transfer
The Fourier number (defined as a.t/L²) is used in the analysis of problem involving heat transfer by

Steady state conduction
Forced convection
Transient conduction
Natural convection

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Heat Transfer
To reduce the tube side pressure drop for the same flow rate, the heat exchanger recomended is

2-4 heat exchanger
3-2 heat exchanger
1-2 heat exchanger
1-1 heat exchanger

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Heat Transfer
Which area is used in case of heat flow by conduction through a cylinder ?

Logarithmic mean area
Geometric mean area
None of the listed here
Arithmetic mean area

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

Decreases
Increases
Increases exponentially
Remains unchanged

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MORE MCQ ON Heat Transfer

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