18) What type of section plane is used for pipe lines with frequent bends offsets at different position?

19) In sectioning of an assembled part the cutting planes panes through rivets, bolts, nuts, shafts, etc are assumed.

20) How does the orientation of hatching line depends in it may be horizontal, vertical or any convenient angle.

21) The lines in a sectional view used to show cutting portion of the object is known as?

22) In a sectional view usually shows _______ details?