In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds. 12.5 17.5 5 2.5 TRUE ANSWER : ? YOUR ANSWER : ?
In a thin cylindrical shell, the hoop stress is __________ stress. Circumferential tensile Radial Compressive Longitudinal TRUE ANSWER : ? YOUR ANSWER : ?
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always Both B & C Less than arithmetic mean value More than arithmetic mean value More than geometric mean value TRUE ANSWER : ? YOUR ANSWER : ?
The clearance between two tubes in a shell and tube heat exchanger is known as 'ligament', whose minimum value is __________ the outside diameter of the tube, but in no case it should be less than 4.5 mm. Three fourth One fourth Half Equal to TRUE ANSWER : ? YOUR ANSWER : ?
The thickness of heat transfer plates used in the plate type heat exchanger ranges from __________ mm, pressed in a single piece provided with grooves & corrugations. 44055 0.3 to 0.8 3.5 to 7.0 1.25 to 3.125 TRUE ANSWER : ? YOUR ANSWER : ?
In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ __________ cms. . 1.2 0.5 6.8 3.8 TRUE ANSWER : ? YOUR ANSWER : ?
The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is pd/t pd/4t pd/2t pd/3t TRUE ANSWER : ? YOUR ANSWER : ?
The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is pd/8t pd/4t pd/2t pd/t TRUE ANSWER : ? YOUR ANSWER : ?
The most common standard size of bubble caps used in industrial operation is 4" dia cap with 8" dia riser 6" dia cap with 4" dia riser 8" dia cap with 1" dia riser 1" dia cap with 0.5" dia riser TRUE ANSWER : ? YOUR ANSWER : ?
Stage efficiency for packed tower varies with the Type & size of packing Fluid rates and fluid properties All of these Operating pressure and column diameter TRUE ANSWER : ? YOUR ANSWER : ?