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Engineering :: Chemical Reaction Engineering


71.  For perfect mixed flow the dispersion number must be
A. zero B. less than 2100
C. less than 2 D. infinity

72.  Which of the following types of tracer input signal can be used to study the extent of non-ideal flow?
A. Periodical signal B. Step signal
C. Pluse signal D. All of the above

73.  For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the diameter of the particle when
A. chemical reaction is the controlling resistance B. diffusion through ash layer is the controlling resistance
C. film diffusion is the controlling resistance.

74.  For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter when
A. film diffusion is the controlling resistance B. chemical reaction is the controlling resistance
C. diffusion through ash layer is the controlling resistance.

75.  The action of a catalyst follows its ability to change the
A. heat of reaction B. heat of formation of the product
C. activation energy D. equilibrium constant.

76.  Which of the following statements is incorrect?
A. A catalyst can be recovered chemically unchanged at the end of a chemical reaction B. A catalyst is incapable of reacting with any one of the reactants
C. Digestion of food in animal body is a catalysed reaction D. A catalyst lowers the activation energy of the reacting molecules.

77.  Which of the following statements is incorrect?
A. A catalyst remains unchanged at the end of a chemical reaction B. A catalyst is highly specific in its action
C. A catalyst does not alter the state of equilibrium in a chemical reaction D. A catalyst initiates a reaction.

78.  In a reversible reaction a catalyst
A. increases the rate of the forward reaction only B. increases the rate of the forward reaction to a greater extent than that of the backward reaction
C. increases the rate of the forward reaction and decreases that of the backward reaction D. increases the rate of forward and backward reaction equally.

79.  The catalytic activity of enzymes is due to their capacity to
A. Lower the potential energy B. lower the kinetic energy
C. increase the activation energy D. lower the activation energy.

80.  A catalyst is a substance which
A. increases the equiliibrium concentration of the product B. changes the equilibrium constant of the reaction
C. shortens the time to reach equilibrium D. suppliies energy to the reaction.




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