A shaft of length 90 mm has a tapered portion of length

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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 tail stock set over method, the taper angle and the set over respectively are

1. 15°32' and 12.16 mm
2. 15°32' and 15.66 mm
3. 11°22' and 10.26 mm
4. 10°32' and 14.46 mm

Correct Option: A

Rate of taper,

T =	80 - 65	= 0.27
	55

Set over =	T × L	=	0.27 × 90	= 12.15
	2		2