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( 5 ) The permeability of polyethylene is much higher than the nylon for the oxygen gas. For packaging pharmaceutical product ( medicine ) ,

(5) The permeability of polyethylene is much higher than the nylon for the oxygen gas. For packaging pharmaceutical product (medicine), it required to keep the diffusion flux of atmospheric oxygen to the medicine as low as possible to avoid its oxidation to increase the shelf life (product expiry). Based on your mass transfer knowledge, which of the following options will you choose
(a)0.2mm film of polyethylene (PE)
(b)0.2mm film of nylon (NY)
(c)(i)0.1mm film of PE and (ii)0.1mm film of NY
(d)(i)0.1mm film of NY and (ii)0.1mm film of PE
(6) In laminar flow regime, the transport of mass occurs
(a) mainly by molecular diffusion
(b) mainly by turbulent diffusion (eddies)
(c) random motion of eddies
(d) all of these is correct
(7) In turbulent flow regime, the transport of mass occurs
(a) mainly by molecular diffusion
(b) mainly by turbulent diffusion (eddies)
(c) random motion of solute molecules
(d) none of these is correct
(8) In convective mass transport, the convective mass transfer coefficient depends upon
(a) molecular transport of solute only
(b) turbulent transport of solute only
(c) both molecular and turbulent solute transport
(d) none of these is correct
(9) The Reynolds number, NRe=Lv, is the ratio of
(a) convective to diffusive mass transport
(b) inertial forces to viscous forces
(c) momentum diffusivity to mass diffusivity
(d) none of these is correct
(10) The Schmidt number, NSC=()DAB, is the ratio of
(a) convective to diffusive mass transport
(b) inertial forces to viscous forces
(c) momentum diffusivity to mass diffusivity
(d) none of these is correct
(11) The Sherwood number, NSh=kc'LDAB, is the ratio of
(a) convective to diffusive mass transport
(b) inertial forces to viscous forces
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