Process Equipment and Plant Design
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.

Working
None of these
Allowable
Damaging

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Process Equipment and Plant Design
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.

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

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Process Equipment and Plant Design
In a vertical short tube evaporator (Calendria type), the

Liquor is inside the tube while the steam is outside the tube
Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used
Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube
All of these

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