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: Option C
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For the length of key having same material as of shaft
L=πd^2/8w
L=πd^2/8×1/4 d
L= π/2 × d
L= 1.57d
Material used for High strength shafts are