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?

Related Mcqs:

1. Factor of safety (i.e., overdesign factor) in heat transfer equipments is about _____________ percent more than the actual/theoretical design factor?

   A. 5-10 B. 15-20 C. 30-35 D. 35-40...

2. Correct use of ‘factor of safety’ is very important in equipment design. It is defined as the ratio of the___________________?

   A. Ultimate stress to breaking stress B. Ultimate stress to working stress C. Working stress to ultimate stress D. None of these...

3. 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...

4. Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is _____________ the longitudinal stress?

   A. Half B. Equal to C. Twice D. Eight times...

5. The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is ______________ stress?

   A. Shear B. Tensile C. Compressive D. Thermal...

6. In a thin cylindrical shell, the hoop stress is ________________ stress?

   A. Radial B. Circumferential tensile C. Compressive D. Longitudinal...

7. In a cylindrical vessel subjected to internal pressure, the longitudinal stress ζL and the circumferential stress, ζn are related by___________________?

   A. ζh = 2 ζL B. ζh = ζL C. ζh = ζL/2 D. No relation exists...

8. LMTD correction factor is used in heat exchanger design for____________________?

   A. Double pipe heat exchanger B. Multipass shell and tube heat exchanger C. Fouling fluids D. Counter flow of hot and cold fluids...

9. It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than _________________?

   A. 0.99 B. 0.95 C. 0.80 D. 0.55...

10. Fouling factor must be included in the calculation of overall design heat transfer coefficient, when the liquid__________________?

    A. Containing suspended solids flows at low velocity B. Containing suspended solids flows at high velocity C. Is highly viscous D. Is of high specific gravity...