“A claming section” before the liquid flows into the downcomer is provided to__________________?

Related Mcqs:

1. In the downcomer of a distillation column, the minimum recommended residence time is about _______________ seconds?

   A. 2.5
   B. 5
   C. 12.5
   D. 17.5

2. A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the__________________?

   A. Central dished section and corner torus section
   B. Corner torus section and central dished section
   C. Central dished section and straight flange section
   D. Straight flange section and corner torus section

3. The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called____________________?

   A. Downcomer liquid seal
   B. Static submergence
   C. Skirt clearance
   D. None of these

4. In packed towers provided with saddle packing, liquid redistributors are positioned at every _______________ times column diameter or 6 metres whichever is less?

   A. 2-3
   B. 5-8
   C. 10-15
   D. 20-25

5. In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed _______________________ of the column diameter?

   A. 1/10-1/15th
   B. 1/5-1/10th
   C. 1/20-1/30th
   D. 1/2 to 1/4th

6. Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than ______________ of the head?

   A. 6% of I.D.
   B. 3 times the thickness
   C. Either A. or B., whichever is larger
   D. Either A. or B., whichever is smaller

7. A pipe is generally made of circular cross-section, because a circular cross-section has the____________________?

   A. Higher structural strength
   B. Lowest surface area requirement for a given volume
   C. Both A. & B.
   D. None of these

8. Theoretically calculated diameter of the stripping section of the continuous rectification column is ______________ that of the enriching section?

   A. Less than
   B. More than
   C. Same as
   D. Either more or less (depending upon relative volatility

9. For pipe flows, head is proportional to ______________ at constant capacity (where D = pipe diameter) ?

   A. 1/D
   B. 1/D2
   C. 1/D5
   D. D2

10. The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the _______________ stress?

    A. Working
    B. Damaging
    C. Allowable
    D. None of these