Structural Analysis Questions and Answers – Cable Subjected to Concentrated Loads and Cables

This set of Structural Analysis Multiple Choice Questions & Answers (MCQs) focuses on “Cable Subjected to Concentrated Loads and cables”.

Following sign convention for force direction is followed:-
Find the tension in cable CD
For moments, clockwise is considered –ve.
All the options are given in KN and KN/ft. wherever applicable.
All distances mentioned below are in ft.
Following is a discreetly loaded cable.
structural-analysis-questions-answers-cable-subjected-concentrated-loads-q1
1. Find the tension in cable CD.
a) 4.79
b) 5.79
c) 6.79
d) 7.79
View Answer

Answer: c
Explanation: Conserve moment about point A and assume required tension a variable. Bifurcate it into x and y directions to make calculation easier.

2. What will be the tension in cable BC?
a) 4.82
b) 5.82
c) 6.82
d) 7.82
View Answer

Answer: a
Explanation: Balance force at point C in x and y direction which will give two equations. Assume the angle between BC and x axis as a variable.

3. What will be the tension in cable AB?
a) 4.9
b) 5.9
c) 6.9
d) 7.9
View Answer

Answer: c
Explanation: Balance force at point B in x and y direction which will give two equations. Assume the angle between AB and x axis as a variable.
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4. What will be the value of h?
a) .74
b) 1.74
c) 2.74
d) 3.74
View Answer

Answer: c
Explanation: Since all the angles are known, we can find h using basic trigonometry.

All the options are given in KN and KN/m. wherever applicable.
All distances mentioned below are in m.
Following is a discreetly loaded cable.
A and E are supported by pin supports.
Find tension in cable AB

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5. Compute tension in cable AB.
a) 110.87
b) 210.87
c) 310.87
d) 410.87
View Answer

Answer: b
Explanation: Balance moment about point E and bifurcate the required tension for easier calculation.

6. What will be the tension in cable DE?
a) 106.12
b) 206.12
c) 306.12
d) 406.12
View Answer

Answer: b
Explanation: Balance force along x and y direction since, tension in cable DE is already known.
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7. In force analysis, weight of cable is generally ________
a) Added
b) Neglected
c) Added in some, neglected in others arbitrarily
d) Depends upon magnitude of other load
View Answer

Answer: d
Explanation: In roofs and bridges it is neglected, but in cases like radio antennas it is considered.

8. It is generally assumed that the cable is ________
a) Perfectly flexible
b) Perfectly inflexible
c) Extensible
d) Perfectly flexible and extensible
View Answer

Answer: a
Explanation: It is assumed to be flexible so that the resistance offered by cable can be neglected which leads to the force always acts tangential to the cable.
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9. It is generally assumed that the cable is _________
a) Perfectly flexible
b) Perfectly inflexible
c) Inextensible
d) Perfectly flexible and extensible
View Answer

Answer: c
Explanation: It is assumed to be inextensible so that we can ignore very minor length changes which occur after application of load.

10. Due to above assumptions, cables behave like:-
a) Rigid body
b) Non-rigid body
c) Fluid
d) Pulley
View Answer

Answer: a
Explanation: Due to these assumptions, geometry of cable remains fixed after application of load.

11. The shape cables take in resisting loads is called a vermicular curve.
State whether the above statement is true or false.
a) True
b) False
View Answer

Answer: b
Explanation: They are called funicular curve often refereed as funiculars.

12. Cables supporting roadway of a suspension bridge is considered to carry point load.
State whether the above statement is true or false.
a) True
b) False
View Answer

Answer: b
Explanation: They are considered to be carrying uniformly distributed load.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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