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__________________?

Related Mcqs:

1. 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

2. _____________ dished head is the strongest of all?

   A. Hemispherical
   B. Elliptical
   C. Torispherical
   D. None of these

3. Generally, elliptical dished heads____________________?

   A. Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for
   pressure vessels operating above a pressure of 1.5 MN/m2
   B. Resist half the pressure rating compared to hemi spherical head provided on the cylindrical
   shell of the same thickness and diameter
   C. Are approximately as strong as seamless cylindrical shell having the corresponding I.D and
   O.D
   D. All A., B. and C.

4. Pressure drop due to pipe fittings can be estimated by the equation, ΔP/ρ = 4f, (Le/D) (V2/2gc) where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (Le/D) (dimensionless) for 45° elbow and 180° close return bends would be respectively around______________________?

   A. 5 and 10
   B. 45 and 75
   C. 180 and 300
   D. 300 and 500

5. Le/D) for 90° elbow (medium radius) and 90°square elbow would be respectively around___________________?

   A. 25 and 60
   B. 3 and 5
   C. 100 and 250
   D. 250 and 600

6. The length of straight rectangular weir used on cross-flow trays is generally ________________ the column diameter ?

   A. 0.6-0.8 times
   B. Equal to
   C. Twice
   D. 2 ft irrespective of (for column > 3 ft diameter)

7. In shell and tube heat exchangers, straight tie rods are used to_________________?

   A. Hold baffle in space
   B. Fix the tubes in position
   C. Account for thermal strain
   D. None of these

8. Optimum reflux ratio in a continuous distillation column is determined by the__________________?

   A. Maximum permissible vapour velocity
   B. Flooding limit of the column
   C. Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
   D. None of these

9. The value of fouling factor depends upon the__________________?

   A. Characteristic of process fluid
   B. Velocity of process fluid containing suspended solids
   C. Suspended solids in the fluid
   D. All A., B. and C.

10. Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the__________________?

    A. Practical limit reached, due to low heat transfer rate because of inadequate temperature
    difference
    B. Economic limit reached, when the plant cost exceeds the saving of steam
    C. Both A. & B.
    D. Neither A. nor B.