Chemical Engineering Model Paper 1. Liquid methyl ketone (MEK) flows through a pipe with an inner diameter of 2.067 inches at an average velocity of 0.48 ft/s. At the fluid temperature of , o 20 C the density of liquid MEK is 0.805 g/cm3 and the viscosity is 0.43 centipoise. Determine the whether the flow is laminar or turbulent. 2. A stream of air (21 mole% O2, the rest N2) flowing at a rate of 10.0 kg/h is mixed with a stream of CO2. The CO2 enters the mixer at a rate of 20.0 m3/h at 150oC and 1.5 bar. What is the mole percent of CO2 in the product stream? 3. At high temperatures phosphine (PH3) dissociates into phosphorus and hydrogen by the following reaction: At 800oC the rate at which phosphine dissociates is (t is in seconds) The reaction occurs in a constant-volume, 2-L vessel, and the initial concentration of phosphine is 5 kmol/m3. If 3 mol of the phosphine reacts, how much phosphorus and hydrogen is produced? (Hint equation: ) Develop expressions for the number of moles of phosphine, phosphorus and hydrogen present at any time, and determine how long it would take for 3 mol of phosphine to have reacted. 4. Ethylene is first chlorinated to yield tetrachloroethane, which is dehydrochlorinated to form trichloroethylene. The standard heat of formation of liquid trichloroethylene is -276.2 kJ/mol. Note: Standard heats of formation for ethylene, hydrogen chloride, chlorine and hydrogen. a) Use the given data to calculate standard heat of formation of tetrachloroethane and standard heat of second reaction. b) Use Hess’s law to calculate the standard heat of the reaction: c) If 300 mol/h of produced in the reaction of part (b), reactants and products are all at 25 °C and 1 atm. How much heat is evolved or absorbed in the process? 5. (a) Steam at 35 bar and 600 K enters a throttling valve that reduces the steam pressure to 7 bar. Assuming there is no heat loss from the valve, what is the exit temperature of the steam and its change in entropy? (b) If air (assumed to be an ideal gas with C P = 29.3 J/mol.K ) entered the valve at 35 bar and 600 K and left at 7 bar, what would be its exit temperature and entropy change?

Chemical Engineering Model Paper -

A stream of air (21 mole% O2, the rest N2) flowing at a rate of 10.0 kg/h is mixed with a stream of CO2. The CO2 enters the mixer at a rate of 20.0 m3/h at 150oC.

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