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Assertion (A): In pre – loaded bolted joints, there is a tendency for failure to occur in the gross plate section rather than through holes.             

Reason (R): The effect of pre – loading is to create sufficient friction between the assembled parts so that no slippage occurs.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not a correct explanation of A

(c) A is true but R is false

(d) A is false but R is true

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