Unit Operations

Question 1
Marks : +2 | -2
Pass Ratio : 100%
With respect to the Tyler series, which of the following is true?
The ratio of one mess size to the intermediate mesh will have the ratio of 4th root of 2
Intermediate messes cannot be accommodated in the Tyler series
Intermediate meshes can be accommodated in British series only
None of the mentioned
Explanation:
Intermediate meshes can be accommodated in Tyler series and the ratio of one mess size to the intermediate mesh will have the ratio of 4th root of 2
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Celinium Sulphate is an exception of the solubility curve. When the temperature is increased, its solubility decreases.
True
False
Explanation:
Celinium Sulphate is an exception of the solubility curve. When the temperature is increased, its solubility decreases.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
What does excess supersaturating followed by cooling lead to?
Primary nucleation
Secondary nucleation
Both, nucleation and crystal growth in general
None of the mentioned
Explanation:
Excess supersaturating followed by cooling only leads to primary nucleation. That’s like the formation of only the first crystal. Secondary nucleation is due to the agglomeration of crystals which is desirable.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Statement 1: Apparent viscosity μ_a is related to shear stress (τ) and shear strain (γ) as μ_a= τ/γ.
True, False
True, True
False, False
False, True
Explanation:
Both the statements are true.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Kick’s law is an intermediate between rittinger’s law and bond’s law.
True
False
Explanation:
Bond’s law is an intermediate between rittinger’s law and kick’s law.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Which of the following pumps is this pump- It has no rotating or reciprocating parts involved. No leakage. Air/gas used to impart energy.
Piston pump
Diaphragm pump
Gear pump
Air-lift pump
Explanation:
Air-lift pump has no rotating or reciprocating parts involved. No leakage. Air/gas used to impart energy.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which of the following filtration equipment operates under continuous operation?
Plate and frame filter press
Pressure leaf filter press
Continuous Rotary Vacuum Filter Press
None of the mentioned
Explanation:
Continuous Rotary Vacuum Filter Press operates under continuous operation.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
One disadvantage with backward feeding is that the feed gets very concentrated at the beginning few units itself and hence it’s difficult to feed it to the next evaporator unit.
True
False
Explanation:
One disadvantage with forward feeding is that the feed gets very concentrated at the beginning few units itself (due to direct steam supply with provides high heat) and hence it’s difficult to feed it to the next evaporator unit.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
A multi stage continuous counter-current extractor has the advantages of both co and counter current processes.
True
False
Explanation:
A multi stage continuous counter-current extractor has the advantages of both co and counter current processes as it has both half miscella and full miscella. One of which supports co current through half of the operation and the other supports counter current through the other half.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
After incipient fluidization, the pressure briefly _____
Increases
Decreases
Stays constant
Varies exponentially
Explanation:
After incipient fluidization, the pressure briefly decreases. This is because at incipient fluidization, the particles only become loose. They aren’t in contact with each other. They don’t start rising up. Hence, the pressure briefly decreases. Once they start moving up, the pressure increases.