Related Questions

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
When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.
A Pool
B Nucleate
C Transition
D Film
Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.
A Molal
B Relative
C Percentage
D None of these
During constant rate drying period, vaporisation rate per unit drying surface area
A Decreases with time
B Increases with time
C Does not change with time
D Does not affect the moisture content of the wet solid
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
To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than
A 2.4 m above the hydraulic gradient
B 6.4 m above the hydraulic gradient
C 10.0 m above the hydraulic gradient
D 5.0 m above the hydraulic gradient
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
Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).
A Entropy
B Internal energy
C Enthalpy
D Gibbs free energy
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
During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change.
A Enthalpy
B Gibbs free energy
C Internal energy
D Entropy

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