When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

When the material of key and shaft is same, and the width of key is o

1.	When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be
A.	0.8 d
B.	1.2 d
C.	1.57 d
D.	1.8 d
Answer» D. 1.8 d

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When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

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