In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around __________________?

Related Mcqs:

1. The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about ______________ times the design pressure?

   A. 1.5 to 2
   B. 3 to 4
   C. 4 to 5
   D. > 5

2. A cylindrical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to________________?

   A. 5 mm
   B. 6 mm
   C. 8 mm
   D. 10 mm

3. Welded joint efficiency in the design of chemical process equipment is taken as_________________?

   A. 0.55
   B. 0.75
   C. 0.85
   D. 0.95

4. 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

5. 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

6. Compensation against openings in process vessels for giving inlet and outlet connections, for providing sight glasses and manholes etc. is provided for strength and rigidity. The most efficient type of compensation is of _______________ type?

   A. Nozzle or rim
   B. Flared out
   C. Fluid in
   D. Ring plate

7. In a continuous distillation column, the optimum reflux ratio ranges from _______________ times the minimum reflux ratio?

   A. 1.1 to 1.5
   B. 1.6 to 2
   C. 2.2 to 2.6
   D. 2.7 to 3

8. In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ _____________ cms?

   A. 1.2
   B. 0.5
   C. 3.8
   D. 6.8

9. The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the _____________ stress?

   A. Yield point
   B. Breaking
   C. Ultimate
   D. None of these

10. Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, ζ = yield strength and E = modulus of elasticity) ?

    A. E
    B. ζ
    C. ζ/E
    D. E/ζ