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Heat Transfer

Heat Transfer
Kg of liquid evaporated per hour in an evaporator is defined as its

Economy
None of these
Steam load
Capacity

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Heat Transfer
Heat transfer co-efficient (h1) for liquids increases with

None of these
Decreasing Reynolds number
Decreasing temperature
Increasing temperature

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

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

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Heat Transfer
A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires

None of these
Less heating surface
Lower maintenance cost
More space

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Heat Transfer
Which type of heat exchanger is preferred for heavy heat loads ?

Plate fine
None of the listed here
Series and parallel set of shell and tube
Double pipe

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Heat Transfer
In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)

α ≠ 1, ε ≠ 1
α = 1; ε ≠ 1
α = 1; ε = 1
α ≠ 1, ε = 1

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