In a suspended cable (i). the bending moment can be reduced by increasing the pull (ii). the tension is constant throughout (iii). the bending moment is zero everywhere
- AOnly (i)Correct
- B(i) and (ii)
- C(ii) and (iii)
- D(i), (ii) and (iii)
Solution
Concept
An ideal suspended cable is perfectly flexible and carries loads only through direct axial tension.
Formula
T = √(H² + V²)
Explanation
A pure suspended cable is fully flexible and cannot take any bending moment, so the bending moment in a cable is zero everywhere.
Why the other options are wrong
B: Incorrect because tension is not constant throughout the cable. C: Incorrect because tension is not constant throughout the cable. D: Incorrect because tension varies along the cable length.
Shortcut
Remember: A cable is perfectly flexible, so Bending Moment = 0 everywhere.
Common mistake
Confusing tension in a cable with being constant; tension varies from minimum at the dip to maximum at the supports.
Correct answer: A) Only (i)