Process Equipment and Plant Design
Which of the following types of reactors is the safest from operation point of view?

A liquid phase reactor
A liquid phase catalytic reactor
Pot type reactor
A vapor phase reactor

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to 'Horton sphere' used for the storage of liquid ammonia.

Diameter of Horton sphere is normally 6 to 25 metres and it is supported by 6 to 12 nos. tubular or rolled section column
Thickness of spherical shell is half that of the cylinderical vessel under same operating pressure condition. Besides, the ratio of surface area to volume is less for sphere than any other shape ; hen
Horton sphere is used for the storage of liquid at sub-zero temperature at very high pressure upto 200 kg/cm²
Horton sphere is used for the storage of gases and volatile liquid at a moderate pressure of 1 to 10 kg/cm²

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to a shell and tube heat exchanger.

Disk and doughnut baffle is the most commonly used baffle
The minimum value of baffle spacing is 50 mm
The maximum value of baffle spacing is equal to the I.D. of the shell
The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these

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