Discussion
First tap, second tap, third tap differ in their:
Answer: B
The three taps differ in their taper lead (the paper prints 'Tape lead').
A hand tap set has the same thread size, pitch and thread form on all three taps. They differ only in how many threads at the front are ground away, or chamfered. The first (taper) tap has a long chamfer of about 8 to 10 threads so it starts easily and cuts gradually; the second (intermediate) tap has a shorter chamfer; the third (plug or bottoming) tap has only one or two chamfered threads, to cut full threads close to the bottom of a blind hole.
Since all three must produce the same thread, they cannot differ in size, pitch or type of thread.
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