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Question
Which of the following statements is true?
Options:
A .  In three wire method, each flank of a thread is touched by a wire in axial plane section and this is valid only for a thread having rank angle
B .  Compression error is always subtracted from effective diameter value obtained
C .  Floating carriage type of micrometer is used for two wire method ----
D .  The value of θ is assumed 30o while calculating best wire diameter for Withworth thread
Answer: Option C
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