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Consider the following types of stresses in respect of a hoisting rope during acceleration of load         

1.   Direct stress due to weight hoisted and weight of the rope.

2.   Bending stressed due to bending of rope over the sheave.

3. Stresses due to initial tightening.

4. Acceleration stresses.                        

Which of these are the correct types of stresses induced in a hoisting rope during acceleration of load?

(a) 1,2 and 3               (b) 2,3 and 4

(c) 1,2 and 4              (d) 1,3 and 4

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