Fluidization Engineering Mcqs

Q:

What kind of designs were proposed for extracting oil from rocks?

A) In situ extraction B) Moving bed processes
C) Fluidized bed D) All of the mentioned
 
Answer & Explanation Answer: D) All of the mentioned

Explanation: They are suggested in order to provide oil economically.

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126
Q:

Which new term is utilized for measuring non spherical particles?

A) Sphericity B) Volume displacement
C) Geometry D) None of the mentioned
 
Answer & Explanation Answer: A) Sphericity

Explanation: This new term is used to express the sphericity of non-spherical particles.

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116
Q:

What is the sphericity of Fisher-catalyst particles?

A) 0.67 B) 0.86
C) 0.63 D) 0.58
 
Answer & Explanation Answer: D) 0.58

Explanation: Based on the data from the Voidage table at Minimum fluidizing conditions.

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105
Q:

In a fluidized bed reactor, for a specific gas flow rate, any kind of Geldart type particles can be used. True of False?

A) True B) False
 
Answer & Explanation Answer: B) False

Explanation: Since the ranges of the particles varies, there should be different gas flow rates.

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104
Q:

For fine solids Reynolds number should be less than?

A) 0.4 B) 4
C) 40 D) 400
 
Answer & Explanation Answer: A) 0.4

Explanation: Since the size of particles is small, the velocity will be comparatively small. Hence the range also reduces.

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101
Q:

What is the relationship between sphericity and voidage?

A) Sphericity=(6(1-voidage))/(a*dp) B) Voidage=(6(1-sphericity))/(a*dp)
C) Sphericity=(6*voidage)/(a*dp) D) Voidage=(6*sphericity)/(a*dp)
 
Answer & Explanation Answer: A) Sphericity=(6(1-voidage))/(a*dp)

Explanation: From the literature and formula derivation, the relation has been developed.

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98
Q:

Which factor is considered in Ergun equation when the Reynolds number is less 20?

A) 150 B) 1.75
C) 2.75 D) 250
 
Answer & Explanation Answer: A) 150

Explanation: Since viscous forces predominate, 150 factor is considered.

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90
Q:

How to distinguish between Entrainment and Elutrition?

A) Based on segregation of particles B) Based on velocity of gas
C) Based on height of reactor D) All of the mentioned
 
Answer & Explanation Answer: A) Based on segregation of particles

Explanation: Entrainment leads to removal of all particles and Entrainment leads to removal of specific particles.

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