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Final Examination - ME20-5ME-2 A.Y

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Question 1 This is a type of dryer that consists of a vertical shaft in which the wet feed is introduced at the top and falls downward over baffles while coming in contact with the hot air that rise ... s and exhausts at the top. This dryer is used for drying palay, wheat, and grains. Response: Tower dryer Question 2 A dryer is to deliver 1,000 kg/hr of cassava with 2% moisture and 20% moisture in the feed. Determine the regain at 20% moisture. _____ % Response: 20.4 Question 3 The Weather Bureau records for certain data indicated a temperature of 28°C. Barometric pressure is 100 kPa and the relative humidity is 75%. Determine the density of water vapor.12/22/2020 Final Examination - ME20-5ME-2/ A.Y. 2020-2021 - University of Batangas https://ubian.ub.edu.ph/student_take_quiz_assignment/display/19039682?part=51&results=204715638# 2/11 _____ kg/m3 Response: 1.12 Question 4 Eight hundred kg of dry air per hour is saturated at 45°C then heated to 105°C, passed through an adiabatic dryer, and discharged at 51°C. Determine the water evaporated from the material in the dryer. _____ kg/hr Response: 18.56 Question 5 Air at 33°C DB and 19°C WB is cooled and humidified by passing through an air washer in which water is continuously recirculated. The air leaves the air washer at 23°C DB. Determine the moisture added per kg d.a. _____ x10^-3 Response: 4.10 Question 6 The humidity ratio corresponding to any given dew point temperature varies with the total barometric pressure, increasing as the barometric pressure Response: Decreases Question 7 A dancing hall is to be maintained at a temperature of 27°C DB and 20°C WB temperatures. The sensible heat load is 130 kW and 70 kg per hour of moisture must be removed. Air is supplied to the hall at 16°C. Find the latent heat load. _____ kW Response: [none] Question 8 Heat added to or removed from a substance that causes a change of temperature: Response: Latent heat Question 9 A dryer is to deliver 1,000 kg/hr of cassava with 2% moisture and 20% moisture in the feed. Determine the regain at 2% moisture. _____ % Response: 2.04 Question 10 Copra enters dryer containing 70% moisture and leaves at 7% moisture. Find the moisture removed on each pound on solid in the final product. _____12/22/2020 Final Examination - ME20-5ME-2/ A.Y. 2020-2021 - University of Batangas https://ubian.ub.edu.ph/student_take_quiz_assignment/display/19039682?part=51&results=204715638# 3/11 Response: 2.26 Question 11 The process of simultaneous heating and humidifying ratio is known as: Response: Heating and humidifying [Show More]

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