Heat sensitive materials with very high latent heat of vaporisation may be economically separated using

An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a

A

Boiler

B

Heat exchanger

C

Recuperator

D

Regenerator

The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation

A

Increases with pressure rise

B

Decreases with increasing pressure

C

Becomes zero at the critical point

D

Both B & C

The solvent used in liquid extraction should not have high latent heat of vaporisation, because

A

The pressure drop and hence the pumping cost will be very high

B

It cannot be recovered by distillation

C

Its recovery cost by distillation may be prohibitatively high

D

It will decompose while recovering by distillation

At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

A

Decreases

B

Increases

C

Remains same

D

Depends on other factors

Which of the following is not used for computing latent heat of vaporisation?

A

Clausius-Clayperon equation

B

Reference substance plots based on Durhing & Othmer plots

C

Kistyakowasky's equation

D

Hess

The latent heat of vaporisation

A

Decreases with increased temperature

B

Decreases as pressure increases

C

Becomes zero at the critical point

D

All of the above

The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is

A

Less

B

More

C

Equal

D

May be less or more depending on temperature

Acetic acid will be most economically separated from a dilute solution of acetic acid in water by

A

Solvent extraction

B

Continuous distillation

C

Evaporation

D

Absorption

The heat of vaporisation __________ with increase in pressure.

A

Increases

B

Decreases

C

Becomes zero at critical pressure

D

Both B and C

Rate of heat transfer by vaporisation from pools of water is affected by the

A

Nature of heating surface and distribution of bubbles

B

Surface tension of water

C

Viscosity of water

D

All of the above

Heat sensitive materials with very high latent heat of vaporisation may be economically separated using

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