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Fluidization Engineering
Fluidization Engineering Multiple Choice
Quiz 1
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Q.1
Which new term is utilized for measuring non spherical particles?
a) Sphericity
b) Volume displacement
c) Geometry
d) None of the mentioned
Q.2
What are the methods for measuring large particles of size above 5mm?
a) Calliper
b) Micrometer
c) Sieves
d) All of the mentioned
Q.3
What are the methods used for measuring particles of size < 0.04mm?
a) Settling rate
b) Brownian movement
c) Sieve analysis
d) All of the mentioned
Q.4
What does ‘-‘ sign mean in the following expression: –+mesh particles?
a) Pass through 150
b) Doesnt pass through 150
c) Pass through 200
d) None of the mentioned
Q.5
What does ‘+’ sign mean in the following expression: –+mesh particles?
a) Pass through 200
b) Retained on 200
c) Retained on 150
d) None of the mentioned
Q.6
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)
Q.7
According to Brown, fractional voids in the packed bed are related to ___________ of particles?
a) Shape
b) Size
c) Sphericity
d) None of the mentioned
Q.8
The pressure drop through the fixed beds of uniformly sized solids has been correlated by ________
a) Ergun equation
b) Poisson equation
c) Laplace equation
d) None of the mentioned
Q.9
Which factor is considered in Ergun equation when the Reynolds number is less 20?
a) 150
b) 1.75
c) 2.75
d) 250
Q.10
Which factor is considered in Ergun equation when the Reynolds number is greater than 1000?
a) 150
b) 1.75
c) 2.75
d) 250
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