chemical engineering Mcqs
8701. Pick out the correct statement?
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A. The reversible work for compression in non-flow process under isothermal condition is the

B. The efficiency of a Carnot engine increases, if the sink temperature is decreased

C. nge in Helmholtz free energy

D. The available energy in an isolated system for all irreversible (real) processes decreases

E. All A, B. and C
8702. 1 torr is equal to ______________ mm Hg column?
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A. 0.1

B. 1000

C. 1

D. 10

8703. Pick out the wrong unit conversion of mass transfer co-efficient?
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A. 1 kg/hr.m2 = 4.8823 lb/hr.ft2

B. 1 lb/hr.ft2 = 4.8823 kg/hr.m2

C. 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar

D. 1 kg/hr.m2.atm= 0.98687 kg/hr. m .bar

8704. A chemical process is said to occur under unsteady state, if the_________________?
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A. Inventory changes do not take place

B. Ratio of streams entering/leaving are independent of time

C. Flow rates & composition both are time dependent

D. None of these

8705. Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________?
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A. (Patm Pvw)xB

B. xB.Patm

C. xB.PvB

D. PvB

8706. Na2SO4. 10H2O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na2SO4. The final concentration of the solute in the solution is 10%. The weight of crystals is________________?
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A. 20

B. 58.65

C. 32.2

D. 45.35

8707. The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is_____________________?
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A. Called percentage saturation

B. Not a function of the composition of gas mixture

C. Termed as relative saturation

D. Not a function of the nature of vapor

8708. A rigid vessel containing three moles of nitrogen gas at 30C is heated to 250C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.C and, Cv = 20.8 J/mole.C. The heat required, neglecting the heat capacity of the vessel, is__________________?
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A. 4576 J

B. 13728 J

C. 12712 J

D. 19206 J
8709. A gaseous mixture contains 14 kg of N2, 16 kg of O2 and 17 kg of NH3. The mole fraction of oxygen is__________________?
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A. 0.47

B. 0.16

C. 0.66

D. 0.33