A key and a shaft are made from the same material. The key is rectangu – McqOptions

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1.	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.	1.25 D
B.	D
C.	1.57 D
D.	1.73 D
E.	2.00 D
Answer» D.

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