Unit Operations

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is used for shredding meat in the food industry?
Ball mill
Hammer mill
Knife cutter
All of the mentioned
Explanation:
A knife cutter which is basically a rotating plate with several knives which is used for shredding meat in the food industry.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Pipes are described in the form of _____
None of the mentioned
Formation Number
All of the mentioned
Schedule Number
Explanation:
Pipes are described in the form of Schedule Number.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
NFo= (αtT)/s2. Here ‘s’ stands for half slab thickness. Based on this data, ‘s’ for a chapatti/ dosa will be _____
Half slab thickness
Full slab thickness
One and a half slab thickness
Double slab thickness
Explanation:
‘s’ for a chapatti/ dosa will be Full slab thickness. This is because ‘s’ equals half slab thickness only when heating takes place from both sides. But, for a chapatti/ dosa, heating takes place only from one end hence‘s’ becomes ‘2s’.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Which of the following conditions show that a certain industrial mixer is the best?
Power load for mixing is minimum
Standard deviation is minimum
Time required for mixing is minimum
All of the mentioned
Explanation:
All of the mentioned conditions show that a certain industrial mixer is the best.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Statement 1: Filter cake increases the efficiency of filtration.
True, False
True, True
False, False
False, True
Explanation:
Filter cake increases the efficiency of filtration as it offers some amount of resistance. Filter aid is added to the filtrate when the filter cake is the desired product.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
According to Nusselt’s film theory, the film thickness decreases as we move from bottom to top. The heat transfer increases.
True
False
Explanation:
According to Nusselt’s film theory, the film thickness increases as we move from bottom to top. The heat transfer decreases.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which food industry is centrifuge NOT used in?
Savory and snack foods
Sugar Industry
Dairy processing
None of the mentioned
Explanation:
All of the mentioned industries use a centrifuge for their products.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Statement 1: Non-Newtonian fluids have a linear relationship between shear stress and shear strain.
True, False
True, True
False, False
False, True
Explanation:
Newtonian fluids have a linear relationship between shear stress and shear strain. Pipes are larger than tubes in diameter and have thicker walls.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Statement 1: NPr= (Cpm)/kl
True, False
True, True
False, False
False, True
Explanation:
NGz= (Cpm)/kl and NPr= (Cpμ)/k.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Microwave heating shows a smaller spread hence more uniform heating
Heat transfer in microwave heating is faster than in conventional heating
Heat transfer in microwave heating is safer than in conventional heating
All of the mentioned
Explanation:
All the given statements with respect to the graph are true.