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

This set of Fluidization Engineering Question Bank focuses on “Entrainment at or Above the TDH-Single Size of Solids”.

1. Which is the best form to describe TDH?
a) Transport disengaging height
b) Total diameter height
c) Total diameter holdup
d) None of the mentioned

Explanation: Specific term used to describe extra height above the bed.

2. 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

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

3. At what velocity entrainment of particles in the fluidized bed takes place?
a) At minimum fluidization velocity
b) At terminal velocity
c) More than terminal velocity
d) At superficial velocity

Explanation: At terminal velocity entrainment starts, when velocity is more than terminal velocity complete entrainment takes place.

4. Which investigator worked on elutrition of two components in batch operation?
a) Leva
b) Zenz and Weil
c) Lewis and Lang
d) Sanari and Kunii

Explanation: From table of ‘experimental conditions of fines’.

5. Which investigator worked on elutrition of FCC catalyst in batch operation?
a) Leva
b) Zenz and Weil
c) Lewis and Lang
d) Sanari and Kunii

Explanation: From table of ‘experimental conditions of fines’.

6. Which investigator worked on elutrition of one components in batch operation?
a) Leva
b) Zenz and Weil
c) Lewis and Lang
d) Sanari and Kunii

Explanation: From table of ‘experimental conditions of fines’.

7. Which investigator worked on elutrition of multi-components in batch operation?
a) Leva
b) Zenz and Weil
c) Lewis and Lang
d) Sanari and Kunii

Explanation: From table of ‘experimental conditions of fines’.

8. What is the range of size of particles to be entrained?
a) 0.06-0.08
b) 0.1-1.0
c) 0.05-0.10
d) All of the mentioned

Explanation: From table of ‘experimental conditions of fines’.

9. Which type of materials are used to experiment the elutrition of particles?
a) Sand
b) FCC catalyst
c) Glass spheres
d) All of the mentioned

Explanation: From table of ‘experimental conditions of fines’.

10. Which type of distributors are used to experiment the elutrition of particles?
a) Filter cloth
b) Perforated plate
c) Grid
d) All of the mentioned

Explanation: From table of ‘experimental conditions of fines’.

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