Related Questions

In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase.
A Liquid
B Gas
C Both A & B
D Neither A nor B
Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.
A No
B The least
C The largest
D Lower
The concept of overall coefficient of heat transfer is used in case of heat transfer by
A Conduction
B Convection
C Radiation
D Conduction and convection
If h₁ = inner film co-efficient and /h₂ = outer film co-efficient, then the overall heat transfer co-efficient is
A Always less than h₁
B Always between h₁ and h₂
C Always higher than h₂
D Dependent on metal resistance
Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be
A 1
B > 1
C ≤ 1
In a gas-liquid absorption coloumn, for obtaining the maximum absorption efficiency
A Liquid stream should be distributed uniformly
B Gas stream should be distributed uniformly
C Both gas as well as liquid streams should be distributed uniformly
D By passing should be completely avoided
Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in
A Decreased solute solubility
B Large minimum liquid to gas (L/G) ratio
C Large number of trays
D All of the above
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
A Convection
B Radiation
C Conduction
D Both convection and conduction
The concept of overall coefficient of heat transfer is used in heat transfer problems of
A Conduction
B Convection
C Radiation
D Conduction and convection
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor

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