Discussion
Statement I: The product surface sits at the wet bulb temperature during the constant rate period.
Statement II: Evaporation removes latent heat as fast as convection supplies sensible heat.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second explains the first. During the constant rate period the surface is covered by free water, and evaporation from it removes latent heat at exactly the rate convection supplies sensible heat from the air.
That balance is the definition of the wet bulb temperature, so the surface sits there and the product stays cool however hot the drying air. It is why heat-sensitive materials tolerate high inlet temperatures while they are still wet, and why they become vulnerable once the falling rate period begins and the surface temperature climbs towards the air temperature.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development