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A shaft of length $90 \: mm$ has a tapered portion of length $55 \: mm$. The diameter of the taper is $80 \: mm$ at one end and $65 \: mm$ at the other. If the taper is made by tailstock set over method, the taper angle and the set over respectively are

  1. $15^\circ 32′$ and $12.16 \: mm$
  2. $18^\circ 32′$ and $15.66 \: mm$
  3. $11^\circ 22′$ and $10.26 \: mm$
  4. $10^\circ 32′$ and $14.46 \: mm$
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