Question:
The porosity of a fluidized bed increased from 0.5 to 0.75. If the initial bed of height was 10 cm, the final bed height is:
The porosity of a fluidized bed increased from 0.5 to 0.75. If the initial bed of height was 10 cm, the final bed height is:
Show Hint
Solids volume constant: (1 - \(\epsilon\))H = constant.
Higher porosity = higher bed height.
Higher porosity = higher bed height.
Updated On: Aug 18, 2026
- 16 cm
- 20 cm
- 18 cm
- 14 cm
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Porosity is the void fraction in a bed.
The bed height changes with porosity.
Step 2: Key Formula or Approach:
Volume of solids is constant: (1 - \(\epsilon_1\)) \(\times\) H\(_1\) = (1 - \(\epsilon_2\)) \(\times\) H\(_2\).
Step 3: Detailed Explanation:
\(\epsilon_1\) = 0.5, \(\epsilon_2\) = 0.75, H\(_1\) = 10 cm.
(1 - 0.5) \(\times\) 10 = (1 - 0.75) \(\times\) H\(_2\).
0.5 \(\times\) 10 = 0.25 \(\times\) H\(_2\).
5 = 0.25 H\(_2\).
H\(_2\) = 5 0.25 = 20 cm.
Thus, the final bed height is 20 cm.
Step 4: Final Answer:
The final bed height is 20 cm.
Hence, the correct option is (B).
Porosity is the void fraction in a bed.
The bed height changes with porosity.
Step 2: Key Formula or Approach:
Volume of solids is constant: (1 - \(\epsilon_1\)) \(\times\) H\(_1\) = (1 - \(\epsilon_2\)) \(\times\) H\(_2\).
Step 3: Detailed Explanation:
\(\epsilon_1\) = 0.5, \(\epsilon_2\) = 0.75, H\(_1\) = 10 cm.
(1 - 0.5) \(\times\) 10 = (1 - 0.75) \(\times\) H\(_2\).
0.5 \(\times\) 10 = 0.25 \(\times\) H\(_2\).
5 = 0.25 H\(_2\).
H\(_2\) = 5 0.25 = 20 cm.
Thus, the final bed height is 20 cm.
Step 4: Final Answer:
The final bed height is 20 cm.
Hence, the correct option is (B).
Was this answer helpful?
0
0
Top ICAR AIEEA Dairy Technology Questions
- As per legal standards (FSSR, 2011), the acidity (%LA) of chakka should not be more than:
- Which of the following food additive is permitted as preservative in paneer?
- Given below are four statements:
Statement (I) : Homogenisation breaks down fat globules in milk into smaller entities.
Statement (II) : Homogenisation breaks down fat globules and casein micelles in milk into smaller entities.
Statement (III) : Homogenisation slightly increases viscosity of milk.
Statement (IV) : Homogenisation improves the appearance of milk.
In light of the above statements, choose the most appropriate answer from the options given below. - With regard to temperature of operation, place the following unit operations in sequence in an increasing order of temperature:
(i) Sterilisation
(ii) Thermisation
(iii) Homogenisation
(iv) Bactofugation and
(v) HTST pasteurization.
Choose the correct answer from the options given below : - “Narampak” and “karapak” refer to varieties of sandesh with reference to which of the following parameters ?
View More Questions
Top ICAR AIEEA Heat Transfer and Unit Operations Questions
- With regard to temperature of operation, place the following unit operations in sequence in an increasing order of temperature:
(i) Sterilisation
(ii) Thermisation
(iii) Homogenisation
(iv) Bactofugation and
(v) HTST pasteurization.
Choose the correct answer from the options given below : - Match List-I with List-II
\begin{tabular{ll} List-I (Name of Process) & List-II (Temperature/time)
(A) Pasteurization & (I) \(60\ ^\circ\text{C}\) no hold
(B) Sterilisation & (II) \(55-60\ ^\circ\text{C}\) no hold
(C) Homogenisation & (III) \(72\ ^\circ\text{C}\) 15 sec
(D) Bactofugation & (IV) \(118\ ^\circ\text{C}\) 15min
Choose the correct answer from the options given below : - In falling film milk evaporator, the temperature difference between milk and steam should be approximately around :
- Indirect UHT treatment can be done using which of the following methods ?
- Which of the following value is related to sterilization process ?
View More Questions
Top ICAR AIEEA Questions
- Which of the following statements is false?
- Which of the following is an example of an inventory?
- According to Adam Smith, productivity gains could be brought about through .
- The supply curve for an artificially scarce good is .
- Which of the following would not be considered an opportunity cost of paid employment?
View More Questions