# Fluidization Engineering Questions and Answers – Entrainment at or Above the TDH-Size Distribution of Solids

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This set of Fluidization Engineering Questions and Answers for Entrance exams focuses on “Entrainment at or Above the TDH-Size Distribution of Solids”.

1. From above figure, what is the diameter of particles with respect to ‘A'(Hint: Glass sphere)?
a) 0.051 mm
b) 0.074 mm
c) 0.094 mm
d) 0.162 mm

Explanation: Smaller the particles size, early entrainment will take place.

2. From above figure, what is the diameter of particles with respect to ‘B'(Hint: Glass sphere)?
a) 0.051 mm
b) 0.074 mm
c) 0.094 mm
d) 0.162 mm

Explanation: Medium particles size, at moderate time the entrainment will take place.

3. From above figure, what is the diameter of particles with respect to ‘C'(Hint: Glass sphere)?
a) 0.051 mm
b) 0.074 mm
c) 0.094 mm
d) 0.162 mm

Explanation: Larger the particles size, lately the entrainment will take place.
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4. From above figure, what is the diameter of particles with respect to ‘E'(Hint: Catalyst)?
a) 0.051 mm
b) 0.074 mm
c) 0.094 mm
d) 0.162 mm

Explanation: Larger the particles size, lately entrainment will take place.

5. From above figure, how increase in pressure is affecting the velocity of solid particles?
a) Decreases
b) Increases
c) No change
d) Fluctuating

Explanation: From experimental data provided.

6. From above figure, how decrease in pressure is affecting the velocity of solid particles?
a) Decreases
b) Increases
c) No change
d) Fluctuating

Explanation: From experimental data provided.

7. Based on which property the solids get separated while elutrition?
a) Size
b) Shape
c) Density
d) All of the mentioned

Explanation: Various factors are responsible for elutrition to take place.

8. How does the introduction of internals in the bed help in elutrition?
a) Separate big size particles
b) Separate small size particles
c) Breaks large particles
d) None of the mentioned

Explanation: Prevents larger particles by forming an obstruction and breaking them.

9. For particles to not reach the TDH, what is the condition required?
a) Ut<Uo
b) Ut>Uo
c) Ut=Uo
d) Ut<=Uo

Explanation: Velocity at which it just reaches the bottom of TDH.

10. Total entrainment rate= SUM(entrainment rate of particle size*fraction of that size in bed) , true or false?
a) True
b) False

Explanation: Derived from theoretical knowledge and applying maths.

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