Food Engineering Questions and Answers – Unit Operations – Diffusion and Mass Transfer-1

This set of Food Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Unit Operations – Diffusion and Mass Transfer-1”.

1. Shifting of a pair of ripened apples from the store house to the vegetable cart is called mass transfer.
a) True
b) False
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2. Statement 1: When alcohol is allowed to move from chamber A to chamber B when a barrier between them is removed, it is called multi phase diffusion.
Statement 2: When oxygen is made to diffuse into the water, it’s called continuous molecular diffusion.
a) True, False
b) True, True
c) False, False
d) False, True
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3. Velocity gradient is the main driving force in mass transfer.
a) True
b) False
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4. Statement 1: A phase boundary exists between alcohol and oxygen.
Statement 2: Phase boundary varies with agitation. It is inversely proportional to the amount of agitation provided.
a) True, False
b) True, True
c) False, False
d) False, True
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5. A phase boundary between alcohol and water exists.
a) True
b) False
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6. Statement 1: Diffusion is faster than convective mass transfer.
Statement 2: Mass transfer is proportional to the area of contact.
a) True, False
b) True, True
c) False, False
d) False, True
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7. Statement 1: Resistance is inversely proportional to the inter-facial area.
Statement 2: The inter-facial area of a body is the area of the dispersed phase in a unit volume of the vessel.
a) True, False
b) True, True
c) False, False
d) False, True
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8. Ratio of equilibrium concentrations of solute A in liquid phase and gas phase i.e. CA_L* and CA_g* respectively is α. α is called _____
a) Diffusion coefficient
b) Distribution coefficient
c) Mass transfer coefficient
d) None of the mentioned
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9. Statement 1: Diffusion of gas component through the resistive film to the bulk of the liquid is the rate determining step.
Statement 2: Diffusion of gas component through the gas-liquid inter-phase is the rate determining step.
a) True, False
b) True, True
c) False, False
d) False, True
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10. In a packaging of dry grapes, the packaging material is made of polyethylene. The dry grapes have certain moisture content. Which of the following is true with respect to the diffusion of certain amount of moisture through the packing?
a) The moisture will not diffuse
b) The diffusion in this case is called permeability
c) None of the mentioned
d) Neither of the mentioned
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Sanfoundry Global Education & Learning Series – Food Engineering.

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