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

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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 rises 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

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