Threads Profiles

Identify the correct statements for 'CREST of a V-Thread profile:
A) Crest is the edge of flank nearest to its axis in case of external thread.
B) Crest is the edge of flank farthest to its axis in case of external thread.
C) Crest is the edge of flank nearest to its axis in case of internal thread.
D) Crest is the edge of flank farthest to its axis in case of internal thread.
E) Crest is the edge of flank on the axis in case of both internal and external thread.
Choose the correct answer from the options given below:

A row of semicircles are drawn in a thread profile of ________.

Match List - I with List - II.
(Thread of P = Pitch, d= Actual depth and D=Theoretical depth)

List - I	List -II
(A) B.S.W. Thread	(I) d = 0.61 P
(B)Metric thread (internal)	(II) D = 0.96 P
(C)Metric thread (external)	(III) d = 0.54 P
(D) Square thread	(IV) D= 0.50 P

Choose the correct answer from the options given below: