Test

1. In what year did Sir Joseph Whitworth devise the first threading standards?
A1850 B1831 C1841
2. What was the Whitworth thread (BSW) based upon?
AA 55 degree thread angle with rounded crest and roots. BA 60 degree thread angle with rounded crest and roots. CA 55 degree thread angle with flattened crest and roots.
3. What industry is the round DIN 405 used in?
AAerospace BPipe CFood & beverages
4. Which one of the following is not used in the pipe industry?
ANPS BUNJ CNPSM
5. The effective diameter is marked with...
AA BB CC
6. Looking at the picture to the left. What is the correct thread classification?
AM40 x P2 x 20 BM20 x P40 x 2 CM20 x P2 x 40
7. Looking at the picture to the left. What is the correct thread classification?
AM3” x 6” x 14 B14 x 6” x 3” C3” - 14UN x 6”
8. Which of the threads in the picture represent a left hand thread?
AA BB
9. Which of the following machining methods displays the best chip disposal properties when external machining of a right hand thread?
AA BB CC
10. Which one of the following can be used for different pitches within a limited pitch range of a common thread angle?
AA BB CC
11. Which interpretation is correct?
AA= thread angle, B= thread length, C= pitch BA= helix angle, B= pitch, C= thread length CA= helix angle, B= major diameter, C= thread length
12. Which interpretation is correct?
AA= thread angle, B= Minor diameter, C= pitch BA=helix angle, B= major diameter, C= thread angle CA= helix angle, B= major diameter, C= pitch
13. Which tool represents tapping?
AA BB
14. When machining an external RH thread, in what way does the work rotate/tool move?
AA BB
15. When machining an internal RH thread, in what way does the work rotate/tool move?
AA BB
16. Which statement is incorrect about the full profile insert?
AMore economical due to less operations. BThe full profile insert has a wiper edge. CCan be used for a wide range of pitches.
17. Which of the following designations fits the lefthand description?
AZ1 BZ2 CS1
18. Which of the lefthand standards represents a Buttress thread?
AA BB CC
19. How large is the tilt angle in external threading and what is its use?
A15 degrees and it is used for avoiding rubbing between insert and work piece. B10 degrees and it is used for avoiding rubbing between the sides of the insert. C10 degrees and it is used for avoiding rubbing between insert and work piece.
20. What kind of infeed method generate this type of chip disposal?
ARadial infeeds. BFlank infeeds. CModified flank infeeds.
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