Process Equipment and Plant Design
The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the

None of these
Smaller reactor should come first
Equal sized reactors are the best
Larger reactor should come first

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.

It is unsuitable for concentrating those liquids, which form a scale or deposit salt
Liquor flows inside the tube, while the steam is outside submerging the tube
Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres
It is suitable for process, in which the final product is a liquor instead of solid

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Process Equipment and Plant Design
In a vertical short tube evaporator (Calendria type), the

Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube
Liquor is inside the tube while the steam is outside the tube
All of these
Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used

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