40 TOP Process Equipment and Plant Design Online Test – Multiple Choice Questions and Answers 1. A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is bending elongation deformation shear 2. Wind load consideration in the design of a support can be neglected, when the vessel is tall but empty tall (say 30 metres), but is full of liquid short (< 2 m) and housed indoor none of these 3. Frame thickness in the plate and frame filter press is normally in the range of __________ inches 1 to 5 1 to 12 0.25 to 8 0.25 to 4 4. Cylinderical shell thickness of rotary drier is generally __________ mm 2-3 6-8 12-15 18-22 5. Which of the following efficiencies can be greater than 100% ? Murphree plate efficiency Point efficiency Overall plate efficiency None of these 6. In a pressure vessel containing multiple openings of various dimensions at different parts, stress concentration at the edges of the opening is maximum which becomes negligibly small beyond the area covered by __________ times the hole diameter 2 5 10 20 7. A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap 19 38 76 96 8. The distance between the centre of a rivet hole to the nearest edge of the plate is called pitch back pitch margin none of these 9. Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8″) three fourth equal to 1.5 times half 10. Pick out the wrong statement The liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding The dischare end of the downcomer must project far enough into the tray liquid so that no gas bubbles can enter the open end and by pass the bubble caps If sufficient residence time (around 8 seconds) is not proivided to the downcoming liquid in the downcomer, it may entrain some vapour none of these Loading … Question 1 of 10
