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উপরের চিত্রে- i.  ∠DAB অবনতি কোণii.  ∠ABC উন্নতি কোণ iii.  ∠DAB = ∠ABC নিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)
A D
B D2
C D0.5
D $$\frac{1}{{\text{D}}}$$
If A varies directly proportional to C and B also varies directly proportional to C, which one of the following is not correct ?
A $$\left( {A + B} \right)\alpha \,C$$
B $$\left( {A - B} \right)\alpha \,\frac{1}{C}$$
C $$\sqrt {AB} \,\alpha \,C$$
D $$\frac{A}{B} = {\text{constant}}$$
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
According to the 'law of mass action', the rate of reaction is directly proportional to the
A Equilibrium constant
B Volume of the reaction vessel
C Nature of the reactants
D Molar concentration of the reactants
∠ABC + ∠BCD + ∠CDA + ∠DAB = ? 
A 90°
B 180°
C 270°
D 360°
সামান্তরিকটির AO = 3 সে.মি. হলে- i. AC = 6 সে.মি.  ii. AC BD iii. ∠DAB = ∠BCD নিচের কোনটি সঠিক? 
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii
Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.
A CO2
B SO2
C NH3
D None of these
The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the
A Lewis-Randall rule
B Statement of Vant-Hoff equation
C Le-Chatelier's principle
D None of these
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is
A Calculated
B Unknown
C Known
D Not required

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