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?

Related Mcqs:

1. 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

2. Poisson’s ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson’s ratio for structural and pressure vessel steel may be taken as ____________________?

   A. 0.01
   B. 0.3
   C. 0.75
   D. 0.95

3. 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

4. Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about ______________ percent of the total thickness?

   A. 1 to 5
   B. 10 to 20
   C. 30 to 40
   D. 40 to 50

5. The practical representative values of HETP for a number of commercial operations lies within a range of ______________ metre?

   A. 0.1-0.2
   B. 0.2-0.5
   C. 0.4-0.9
   D. 1.2-1.5

6. Tube wall thickness depends on the corrosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than _____________ mm outside diameter is generally not recommended for fouling fluids ?

   A. 16
   B. 19
   C. 28
   D. 38

7. 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

8. 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

9. Larger depth of liquid on the trays of a distillation column_________________?

   A. Leads to high tray efficiency
   B. Results in higher pressure drop per tray
   C. Both A. & B.
   D. Neither A. or B.

10. In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones; because the smaller diameter tubes ______________?

    A. Are easier to clean
    B. Are less prone to fouling
    C. Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
    D. None of these