TOP 50 Unit Operations Quiz and Answers

I have written this unit operations quiz to test your knowledge on a range of topics. This will serve as a fun memory refreshing exercise as well as an opportunity to showcase your current knowledge. Each question also has detailed explanations once you click on the question. These Unit Operations Quiz and Answers are composed by our Livemcqs team.

Unit Operations Quiz and Answers

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

 
 
 
 

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.

 
 
 
 

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.

 
 
 
 

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.

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 

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

 
 

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

 
 
 
 

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

 
 

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.

 
 
 
 

Which of the following with respect to mixing is true?

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 

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

 
 
 
 

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

 
 
 
 

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.

 
 
 
 

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.

 
 
 
 

Statement 1: Where Pg is power for a gassed system and Po is power for an ungassed system, Pg/Po is _____
Statement 2: Na stands for _____

 
 
 
 

Statement 1: Flat blade/curve blade/arrow head/vaned disc turbines are generally used for gas-liquid mixing.
Statement 2: Helical screw/ribbon mixer/gate anchor are generally used for solid-solid mixing.

 
 
 
 

Which of the following is true with respect to Carbonation?

 
 
 
 

With respect to dipping oil emulsions, which of the following is true?