Question

After incipient fluidization, the pressure briefly _____

(a) Increases

(b) Decreases

(c) Stays constant

(d) Varies exponentially

I got this question during an online interview.

My question is from Unit Operations in division Heat Transfer Equipment, Microwave Heating, Evaporation, Diffusion and Mass Transfer and Dehydration of Food Engineering

Answer 1

Right answer is (b) Decreases

For explanation: After incipient fluidization, the pressure briefly decreases. This is because at incipient fluidization, the particles only become loose. They aren’t in contact with each other. They don’t start rising up. Hence, the pressure briefly decreases. Once they start moving up, the pressure increases.