A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and height of the key being 14mm and 80mm respectively. Find the compressive stress induced in the key.

A muff coupling is connecting two shafts. The torque involved is 650N

1.	A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and height of the key being 14mm and 80mm respectively. Find the compressive stress induced in the key.
A.	70.1 N/mm²
B.	51.6N/mm²
C.	45.5N/mm²
D.	None of the listed
Answer» C. 45.5N/mm²

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