A Keyway on the Shaft Lowers

Answer: C- Both the strength and rigidity of the shaft

A keyway on the shaft lowers both strength and rigidity of the shaft.

Solution: 

A keyway is the slot machine on the rotating element. When a shaft has a keyway cut into it, stress is concentrated there, increasing the likelihood of the shaft failing. A keyway in the shaft causes a decrease in the shaft's cross-sectional area, which results in a decrease in the shaft's torsional strength. So it can be concluded that a keyway on the shaft lowers both strength and rigidity of the shaft.

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