With increase in porosity, the thermal conductivity of a solid substance

Heat Transfer
With increase in porosity, the thermal conductivity of a solid substance

May increase or decrease; depends on the solid

Decreases

Remains unchanged

Increases

May increase or decrease; depends on the solid

Decreases

Remains unchanged

Increases

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Heat Transfer
In Fourier's law, the proportionality constant is called the

Stefan-Boltzman constant

Thermal conductivity

Thermal diffusivity

Heat transfer co-efficient

Stefan-Boltzman constant

Thermal conductivity

Thermal diffusivity

Heat transfer co-efficient

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Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Presence of a non-condensible gas decreases the condensing film co-efficient

All of these

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes

Presence of a non-condensible gas decreases the condensing film co-efficient

All of these

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes

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Heat Transfer
When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids?

At high fluid velocity

When fluid flows past a smooth surface

At low velocity

None of these

At high fluid velocity

When fluid flows past a smooth surface

At low velocity

None of these

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Heat Transfer
The advantage of backward feed multiple effect evaporators over forward feed units is that

There is no additional cost of pumping

Equal heat transfer co-efficients exist in various effects

Heat sensitive material can be handled

Most concentrated liquid is at highest temperature

There is no additional cost of pumping

Equal heat transfer co-efficients exist in various effects

Heat sensitive material can be handled

Most concentrated liquid is at highest temperature

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Heat Transfer
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

Lower capacity

Both A & B

Lower economy

Higher economy

Lower capacity

Both A & B

Lower economy

Higher economy

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Heat Transfer

Heat Transfer With increase in porosity, the thermal conductivity of a solid substance

Heat Transfer In Fourier's law, the proportionality constant is called the

Heat Transfer In a gas-liquid shell and tube heat exchanger, the

Heat Transfer When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids?

Heat Transfer The advantage of backward feed multiple effect evaporators over forward feed units is that

Heat Transfer A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

Heat Transfer
With increase in porosity, the thermal conductivity of a solid substance

Heat Transfer
In Fourier's law, the proportionality constant is called the

Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Heat Transfer
When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids?

Heat Transfer
The advantage of backward feed multiple effect evaporators over forward feed units is that

Heat Transfer
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides