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Engineering :: Chemical Reaction Engineering


51.  The space-velocity is the proper performance measure of flow reactors. The space-velocity has the units of
A. time B. (tme)-1
C. velocity D. (velocity)-1

52.  The space-velocity of 2 hr-1 means
A. that every two hours one reactor volume of feed at specified conditions is being treated by the reactor B. that two reactor volumes of feed at specified conditions are bing fed into the reactor per hour
C. that the actual reactor volume is double that of the optimum reactor volume D. that one-half reactor volume of feed at specified conditions are being fed into the reactor.

53.  For constant-density systems, the performance equations are identical for
A. batch reactor and plug flow reactor B. batch reactor and backmix reactor
C. plug flow reactor and backmix reactor D. batch reactor, plug flow reactor and beckmix reactor.

54.  For identical feed composition, flow rate, conversion and for all positive reaction orders, the ratio of volumes of the mixed reactor to the plug flow reactor is
A. always one B. always less than one
C. always greater than one D. equal to the order of reaction.

55.  The batch reactor has the disadvantage(s) of
A. high labour and handling cost B. Poorer quality control of the product
C. considerable shutdown time to empty, clean out and refill D. all of the above

56.  For identical feed compostion and flow rate, N plug flow reactors in series with a total volume V gives the same conversion as a single
A. plug flow reactor of volume V B. CSTR of volume V
C. Plug flow reactor of volume V/N D. plug flow reactor of volume NV.

57.  N plug flow reactors in series with a total volume V gives the same conversion as a single plug flow reactor of volume V. The above statement is true for
A. zero-order reactions only B. first-order reactions only
C. second-order reactions only D. all reaction orders.

58.  The optimum size ratio for two mixed reactors in series is found in general to be dependent on the kinetics of the reaction and on the conversion level. For reaction order more than one
A. the larger reactor should come first B. the smaller reactor should come first
C. equal size reactors are best.

59.  Pure gaseous reactant A (CAO = 100 millimol/litre) is fed at steady rate into a mixed reactor where it dimerizes (2A ? R). For a certain gas feed rate the concentration of A in the exit stream is found to be 50 millimol/litre. The fractional conversion of A is
A. 50% B. 33.33%
C. 40% D. 66.67%

60.  One litre per second of gaseous reactant A is introduced into a mixed reactor. The stoichiometry is A ? 3R, the conversion is 50% and under these conditions the leaving flow rate is 2 litres per second. The space-time for this operation is
A. 1 sec B. sec
C. 2 sec D. ? sec




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