A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process ?
Correct answer: C. Temperature of the solid
- A. Flow rate of inlet air
- B. Relative humidity of outlet air
- C. Temperature of the solid
- D. Humidity of inlet air
Explanation
Case hardening results when the surface dries and hardens too quickly, restricting internal moisture movement. Controlling the solid temperature helps limit this excessive surface drying and maintains a workable drying rate.
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