Practice Exam 1

# Practice Exam 1 - STUDENT NAME 1(10 points A(2 points Water...

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STUDENT NAME 2 1 (10 points) A. (2 points): Water enters from the top of a 10 m 3 tank at a rate of 5 kg/sec, and is simultaneously withdrawn at 3 kg/sec through a pipe at the bottom of the tank. The tank initially contained 1 m 3 of water. The rate of accumulation of water in the tank is _______ kg/sec. B. (3 points): The dimensionless Prandtl number (Pr = μ. C p / k ) of a fluid with viscosity μ = 400 lb m /(ft.h), specific heat C p = 1.4 J/(g.°C) and thermal conductivity k = 0.07 W/(m. K) is __________. C. (5 points): A butane (C 4 H 10 )-oxygen (O 2 ) mixture is flammable only if the mole % of butane is between 10% and 19%. A butane-oxygen mixture with 14 mole % butane flowing at 500 kg/hr is to be diluted with oxygen to reduce the butane content below the lower flammability limit. The mass flow rate of oxygen required is ___________ kg/hr. Data : T(K) = T( o C) + 273.15 1 lb m = 0.454 kg; 1 m = 3.281 ft 1 J = 1 W.s Density of water = 1,000 kg/m 3 Atomic weights: O: 16, C: 12, H: 1

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STUDENT NAME 3 2 (10 points) Two streams containing ethanol (C 2 H 5 OH) and water (H 2 O) are mixed in a tank. The first stream contains 20% ethanol (by mass), whereas the second stream contains 80% ethanol. A product
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