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Heat Transfer

Heat Transfer
A __________ evaporator employs an annular downtake.

None of these
Basket type
Long tube vertical
Horizontal

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Heat Transfer
A diathermaneous substance __________ the thermal radiation completely.

Reflects
Transmits
None of these
Absorbs

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Heat Transfer
Conductance is given by(where, x = thickness, A = heat flow area, K = thermal conductivity.)

KA/x
X/KA
A/Kx
K/Ax

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Heat Transfer
Thermal conductivity of a gas at low density, __________ with increase in temperature.

Decreases
Remains unchanged
Increases
May increase or decrease; depends on the gas

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Heat Transfer
Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is __________ law.

Wien's
Kirchoffs
Stefan's
Dalton's

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Heat Transfer
The energy radiated from a surface Q at absolute temperature T is related as

None of these
Q ∝ T³
Q ∝ T²
Q ∝ T⁴

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