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A key and a shaft are made from the same material. The key is rectangular with a width of D/4 and a height of 3D/16. The shaft is under torsion only. The necessary length of the key for equal strength of the shaft and key will be

[A].	D	[B].	1.25 D
[C].	1.57 D	[D].	1.73 D
[E].	2.00 D

Answer: Option C

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