Heat Transfer Operations Mock Test 4

10%

Question 1 of 10

1. What is the term Ɵ in the Kozeny Carman equation for laminar flow in packed beds?
\(\frac{∆P}{L} = \frac{-180μ}{S^2 D_P^2} (\frac{(1-∈)^2}{∈^3}) ϑ_S \)

Void fraction

Density

Surface Area of pellets

Sphericity of Pellets

Question 1 of 10

Question 2 of 10

2. As an Indirect contact HE, Packed beds have _______ fluid flow.

Intermittent

Continuous

Reversing

Constant

Question 2 of 10

Question 3 of 10

3. What is the relation between superficial velocity and average fluid velocity in a packed bed?

ϑ=φ\(^\frac{\vartheta}{u}u\)

ϑ=u/φ

ϑ=φ^0.14u

ϑ=φu

Question 3 of 10

Question 4 of 10

4. For very low dp/di, the temperature pattern is similar to that of complete mixing and turbulent flow.

True

False

Question 4 of 10

Question 5 of 10

5. What does the following diagram represent?

Fischer -Tropsch synthesis

Cracking and reforming of hydrocarbons (oil)

Carbonization and gasification of coal

Limestone calcination

Question 5 of 10

Question 6 of 10

6. For an Endothermic Reaction, which of the following operation is best suited to support the reaction?

Shell and tube with hot fluid in shell and packed bed in tube

Shell and tube with hot fluid in tube and packed bed in shell

Shell and tube with cold fluid in tube and packed bed in shell

Shell and tube with cold fluid in shell and packed bed in tube

Question 6 of 10

Question 7 of 10

7. If A_DC is the fouling deposit area on the vessel side, then what is its resistance?

R = 1/h_DCA_DC

R = 1/h_TA_DC

R = 1/h_DCA_T

R = 1/hA_DC

Question 7 of 10

Question 8 of 10

8. In a Packed Bed Shell and Tube HE, the pellets are usually kept _______

At floor of the shell

At Shell side

At Tube Side

At any side as required

Question 8 of 10

Question 9 of 10

9. What is the heat transfer area for the following setup?

0.357m²

0.3m²

0.4m²

0.377m²

Question 9 of 10

Question 10 of 10

10. The heat transfer coefficient ________ with increasing flow rate.

Decreases

Remains the same

Increases

Drops drastically

Question 10 of 10