Heat Transfer Operations Practice Test 9

1. Which dryer has the following description – ‘a liquid containing dissolved solids or slurry carrying suspended solids forms a thin layer on the outside surface of a large rotating vessel’?

2. Which one of the following is not a continuous feed dryer?

3. When do we apply the Kirkbride equation for determination of heat transfer coefficient in a condenser?
h=0.0077 Re^0.4[K³ ρ²g ⁄ μ²]^1/3

4. What is the expression for the laminar film thickness of the condensate at a distance of x from the top of the condenser?

5. Which one of the following condensation phenomenon is usually avoided in Condensers?

6. What is the name of the following drying equipment?

7. Drum dryer mainly handles the materials that are too thick for a spray dryer and too thin for a rotary dryer.

8. What is the term Ψ in the given equation of free energy ΔG required to release unit molal quantity of this moisture?
ΔG = – RT Ln(Ψ)

9. What happens in the falling rate period?

10. Which one of the following is the correct temperature time plot of batch drying?