61.
In a cylinderical vessel subjected to internal pressure, the longitudinal stress $${\sigma _{\text{L}}}$$ and the circumferential stress, $${\sigma _{\text{h}}}$$ are related by

65.
The wall thickness of thin cylindrical shell with hemispherical ends is __________ that of the spherical ends.

66.
Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of __________ times the paddle diameter.

68.
Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.

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