Q. Which of the following with respect to mixing is true?

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Q. Statement 1: Root mean square is denoted by σ₂
Statement 2: σ₂ will show the variation of a composition obtained after mixing. Hence the lesser it is, the more efficient is the mixing.

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Q. Mixing index is applicable for mixing of solids at zero time.

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Q. Which of the following conditions show that a certain industrial mixer is the best?

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Q. Mixing Index is a ratio of the standard deviation of various products during mixing to that at zero mixing.

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Q. Rate of mixing at any time is given by the extent of mixing at that particular time.

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Q. The force used for mixing by mixing equipment for pastes and dough is _____

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Q. The clearance between the impeller and the vessel in a mixer is usually kept _____

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Q. Statement 1: Kneaders are specially used for pastry/viscous liquids in the food industry.
Statement 2: Kneaders are used for mixing dough with fats and making them homogeneous mixtures.

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Q. Statement 1: Effectiveness of mixing in kneaders depends on the blade design.
Statement 2: Kneaders have a high clearance between the two oppositely rotating blades and the vessel.

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Q. Statement 1: Which mixture is used when one of the components is very less in quantity?
Statement 2: This mixer is used to mix items in savory or a snack item.

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Q. Which of the following is true with respect to mixing operations in the food industry?

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Q. Which of the following is NOT an application of mixing solids in the food industry?

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Q. Which of the following is NOT a mixing involved with fluids in the food industry?

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Q. Which of the following does NOT include power required for mixing by an impeller?

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Q. Power required for a gassed system is more than that required for an ungassed system.

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Q. Statement 1: Froude number relates the gravitational effect which is important when the liquid is agitated by an impeller.
Statement 2: When Nʀₑ,ᵢ < 300, NFr is ineffective.

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Q. With respect to the relationship between the power number and the impeller Reynolds’s number, which amongst the following statements is true?

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Q. Statement 1: In the transient zone, the power input depends on the density and viscosity of the fluid.
Statement 2: In the laminar zone, the power input depends on the density only. It is independent of the viscosity of the fluid.

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Q. Statement 1: For non-Newtonian fluids, another term called apparent viscosity is used as their viscosity changes with the change in the shear rate.
Statement 2: For non-Newtonian fluids, between the transition region, the power number for non-Newtonian fluids is slightly higher than that for Newtonian fluids.

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