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O-K-State BAE 2023 - Study Guide

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Final ExamFinal ExamBAE 2023 Physical Properties of Biological Matls. Spring 2009Do all problems and please show your work in order to receive partial credit.1. (3 points) List two different spectral color identification systems along with the industries that typically use them.2. (3 points) A) From the storage and culture report your group presented, list one storagemethod you found different between the cultural group in your report and the USA. B) What is the justification (or reason) for the different method?3. (3points) Why is it necessary to know the penetration depth of microwave energy in a food product?4. (5 points) Find the other 5 characteristics at the following state point: 32 Cdry bulb and 20% RH. (use the p-chart)5. (6 points)A) Find the NPSH for the system below:B) If the pump required an NPSH of 6.5 ft, would its requirements be met? 20 ft. 8 ft.Pgauge = 3.5 psig17 ft.8.6 ft.6. (5 points) A ventilation fan operates at 4830 cfm at 1.00 inches (density = 4.3 x 10-5 lb/in3). The rectangular outlet measures 15” x 20”. The unit is powered by a 7.5 hp motor. Determine the total pressure for the fan.7. (5 points) A centrifugal fan produces 7850 cfm at 3.5 in. of water using 10 HP (3450 rpm). What speed would be required to deliver 9250 cfm? What would the pressure and horsepower be at this new speed?8. (10 points) A steel grain bin is 75 ft tall with a diameter of 80 ft. It is filled with 11.0% mc. wheat. Estimate the lateral and vertical forces at the top and bottom of the bin. The fill depth is 62 ft.9. (10 points) An air stream at 35C (.012 kg/kg air humidity ratio) is moving at 725 kg/min. It is injected with 225 C steam at 12 kg/min. Determine the state of the mixture.10.(10 points) Joe Bob, the famous Turkey Creek noodler, needs to cool Saturday night’s catch of flathead catfish (68kg) from 25C to -8C. AssumeMC of 80% and at -8C, 20% won’t be frozen. Specific heat above 0C is 3.4 J/g-C and 1.9 J/g-C below 0C. How much heat must Joe Bob’s wife remove to preserve Joe Bob’s catfish?11.(10 points) Wheat harvested at 14% moisture content (wb) must be storedat 12% moisture content. The aeration system will produce 3.0 m3/sec. A) Assuming the ambient are temperature is 38 C and 28% RH, how long will it take to dry 1000 kg (weight at 14%) of wheat? B) How much water will be removed?12. (10 points) Olga cuts a block of kielbasa to 3.8 cm x 3.8 cm x 3.8 cm. She then compresses it using a patty press to 2.5 cm with 450 N force. Calculate the stress and strain of Olga’s kielbasa cube.13.(5 points) Emil, the wheat farmer, delivers a 125 bu load of 17 % mc (dry base) wheat to the local elevator. How much wheat at 12% mc (wet base)would the elevator manager have to mix with Emil’s wheat to have a resultant mixture at 13% mc (wet base)? 14.(5 points) What quantity of air in a pneumatic sorting system is required to remove wheat chaff from wheat kernels?15.(10 points) A refrigeration system has the following specs requires 20 KW,has an evaporator temperature of -16C, and a condenser that is water cooled with 21C water. The compressor volumetric efficiency is 84% and the thermal efficiency is 87%.Find:A) High and low side pressuresB) Refrigerant rateC) C.O.P.coolingD) Compressor displacementE) Compressor power per unit of refrigeration requiredExtra credit: (5 points)1. (5 points) A pile of wheat stored temporarily outside in NW Oklahoma has a base diameter of 52 m. How tall is this pile of wheat?2. (5 points) What was the “magic number” in class last Friday?HAVE A GREAT SUMMER AND WE’LL SEE YOU NEXT FALL !


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O-K-State BAE 2023 - Study Guide

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