pany operates by using a feedstream of 150 Ib/hr of dirty, unpeeled enter the pl

Question

pany operates by using a feedstream of 150 Ib/hr of dirty, unpeeled enter the plant and go through the washing, peeling, slicing. cooking, oil separation and seasoning steps prior to packaging 1. In addition to the 150.0 Ib/hr of dirty potatoes, water Ib/hr and cleans off the th at 206.0 lbhdrt fromheer enters stage 1 (washing) at 200.0 (but they are totally clean and contain no dirt), how potatoes? e potatoes, creating a waste stream that leaves stage 1 ng the potatoes leaving stage 1 take 2 Ibs/hr of the water withthem much dirt is there on 150.0 lbs of A. 12 lbs B. 10 bs C8 lbs D. 6 lbs E. 2 lbs 2. What is the rate of wet potatoes (potatoes plus water) leaving stage stage 2, peeling? 1 and enteri . 175 lb/hr B. 152 Iblr (c)44 lbhr D. 140 lbhr E.134 lbhr 3. The weight or mass fraction of a process stream is defined as the ratio of one component's mass to the total mass of the stream. Since the entire stream is flowing at the same rate, this equals the mass flow rate of component 1 divided by the total mass flow rate of wet potatoes (which you determined in question 1). What is the weight (mass) fraction of potatoes in the stream that enters the peeling process? A. 5.4 wt % B. 88.6 wt% C. 92.3 wt % D. 95.2 wt%(E)98.6 wt % 4. In the peeling process (stage 2), 26.0 lb/hr of potato skins are peeled off, and leave in the "skins" stream. In stage 3, 0.50 lb/hr of potatoes are lost by sticking to the s blades. What is the rate of dry potatoes leaving stage 3 (assume al during slicing)? I water is removed A. 112 lb/hr B. 115.5 lb/hr C. 119.5 lb/hr D. 167.5 lb/hr E. 168.5 Ib/hr 5. In the cooking stage, the potatoes are added to a hot vat of cooking oil where they gain 10.0 wt% ofthe dry potato mass (the oil ends up leaving the cooker with the potatoes). What is the rate at which new cooking oil must be added to the vat so that there is always the same mass of oil in the vat at all times? te includes both recycled and fresh cooking oil) 45 Ib/hr B. 9.15 lb/hr C. 10.41155 Ibhr E. 13.75 lb/hr

Explanation / Answer

Ans 1, 2, 3 are correct

Ans 1

Inlet dirty potatoes rate = 150 lb/hr

Inlet water rate = 200 lb/hr

2 lb/hr water transfered from water to potato stream.

Water out = 200 - 2 = 198 lb/hr

Dirt in potatoes = waste stream - water out

= 206 - 198 = 8 lb/hr

Ans 2

Rate of wet potatoes = clean potatoes + water

= inlet dirty potatoes - dirt + water

= 150 - 8 + 2 = 144 lb/hr

Ans 3

Mass fraction of potatoes = mass of clean potatoes / rate of wet potatoes

= (150 - 8) / (144)

= 142/144

= 0.986 = 98.6%

Ans 4

Wet potatoes leaving stage 1 = 144 lb/hr

Dry potatoes leaving stage 3 = wet potatoes - potato skins peeled off - lost potatoes - water

= 144 - 26 - 0.5 - 2

= 115.5 lb/hr

Option B is the correct answer

Ans 5, 6, 7, 8 are correct

Ans 9

Seasoning required for 24 hr = 3.30 lb/hr x 24 hr = 79.2 lb

Option D is the correct answer

Ans 10

Recycled amount of seasoning for 24 hr = 0.33 lb/hr x 24 hr

= 7.92 lb

Fresh seasoning required = Initial seasoning required - recycled seasoning

= 79.2 - 7.92 = 71.28

= 71.3 lb

Option E is the correct answer

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