Mass Transfer - Study Mode

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[#441] A binary mixture of benzene and cyclohexane is separated by

(A) Flash vaporisation

(B) Extractive distillation

(C) Solvent extraction

(D) Ordinary distillation

Correct Answer

(B) Extractive distillation

[#442] The relative saturation of an unsaturated mixture of gas and vapor is independent of the

(A) Nature of the vapor

(B) Temperature of the mixture

(C) Composition of the mixture

(D) None of these

Correct Answer

(D) None of these

[#443] H 2 S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5x. The bulk concentration of H 2 S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

(A) 2.0

(B) 1.56

(C) 1.0

(D) 0.56

Correct Answer

(A) 2.0

[#444] Which of the following plays an important role in problems of simultaneous heat and mass transfer?

(A) Lewis number

(B) Schmidt number

(C) Prandtl number

(D) Sherwood number

Correct Answer

(A) Lewis number

[#445] In most of the vacuum crystalliser, vacuum is generally produced by means of a

(A) Suction pump

(B) Compressed air jet

(C) Steam jet ejector with a barometric condenser

(D) None of these

Correct Answer

(C) Steam jet ejector with a barometric condenser