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.Management Sciences
Category: Chemical Reaction
A space time of 3 hours for a flow reactor means that___________________?
A. The time required to process one reactor volume of feed (measured at specified conditions) is
3 hours
B. Three reactor volumes of feed can be processed every hour
C. It takes three hours to dump the entire volume of the reactor with feed
D. Conversion is cent per cent after three hours
Threshold energy in a reaction is equal to the_________________?
A. Activation energy
B. Normal energy of reactants
C. Sum of A. & B.
D. Neither A. nor B.
Rate of a gaseous phase reaction is given by the reaction shown in the bellow figure. The unit of rate constant is__________________?
A. (atm)-1
B. (hr)-1
C. (atm)-1.(hr)-1
D. atm.(hr)-1
Most important characteristics of gas-liquid reactors are the________________?
A. Specific inter-facial area
B. Liquid hold-up
C. Both A. and B.
D. None of these
The catalyst in a second order reversible reaction increases the rate of the forward reaction___________________?
A. And decreases that of backward reaction
B. And backward reaction equally
C. Only
D. To a greater extent than that of the backward reaction
Effectiveness factor E. of a catalyst pellet is defined as, E = (actual rate within pore of the catalyst)/(rate if not snowed by pore diffusion), Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus) ___________________?
A. tan hT/T
B. tan T/T
C. tan hT/tan T
D. None of these
As the chemical reaction proceeds, the rate of reaction ___________________?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease depending on the type of reaction
Variables affecting the rate of homogeneous reactions are___________________?
A. Pressure and temperature only
B. Temperature and composition only
C. Pressure and composition only
D. Pressure, temperature and composition
Inversion of cane sugar is an example of ______________________?
A. Unimolecular reaction with first order
B. Bimolecular reaction with second order
C. Bimolecular reaction with first order
D. Unimolecular reaction with second order
A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are_____________________?
A. Equal in size
B. Of different sizes
C. Of such size that the ratio of their volumes is < 5
D. None of these
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