( Chapter & Threads and Fasteners1 bla-9) The schematic thread symbol draws lines at every crest and blank Fill in On 10) The simplified thread symbol usesaline to represent the on external threads. a) visible b) hidden c) center d) phantom 08-11) How much longer is the tap drill depth than the thread depth when tap? a) 1 times the pitch b) 2 times the pitch c) 3 times the pitch d) 4 times the pitch diameter Q8-12) The tap drill diameter is closest in size to the a) major b) minor c) pitch Unified national threads Q8-13) 1/4 - 20 UNC. What is 20? a) Major diameter b) Pitch c) One over the pitch d) Thread form e) Thread series Q8-14) 1/2-13 UNC. What is UN? a) Major diameter b) Pitch c) One over the pitch d) Thread form e) Thread series Q8-15) 3/8 -24 UNF. What is F? a) Major diameter b) Pitch c) One over the pitch d) Thread form e) Thread series