Mass Transfer - Study Mode

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[#511] The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, N Pr = N Sc = __________

(A) 1

(B) 0.5

(C) 10

(D) 0

Correct Answer

(A) 1

[#512] The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m 2 /m 3 )

(A) 500

(B) 1200

(C) 900

(D) 800

Correct Answer

(A) 500

[#513] The ratio of Murphree plate efficiency to point efficiency is 1 in a __________ flow model.

(A) Plug

(B) Perfectly mixed

(C) Both A & B

(D) Neither A nor B

Correct Answer

(B) Perfectly mixed

[#514] Which of the following binary systems is an example of a maximum boiling azeotrope?

(A) Water-hydrochloric acid

(B) Acetone-carbon disulphide

(C) Water-ethyl alcohol

(D) N-heptane-n-octane

Correct Answer

(A) Water-hydrochloric acid

[#515] Capacity of a rotary dryer depends on its

(A) R.p.m

(B) Inclination with ground surface

(C) Both A & B

(D) Neither A nor B

Correct Answer

(C) Both A & B