# Machine Design Questions and Answers – Buckling of Columns

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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Buckling of Columns”.

1. Piston rod is an example of column.
a) True
b) False

Explanation: An slender machine component having its length considerable in proportion to its width qualifies for a column criterion.

2. Bucking of column means
a) Lateral deflection
b) Axial deflection
c) Torsional deflection
d) None of the listed

Explanation: Buckling is characterised by lateral deflection but it is different from lateral deflection as there is sudden lateral deflection in buckling unlike lateral deflection where there is gradual deflection.

3. Slenderness ratio is [l= length of column and k= least radius of gyration of cross section about its axis].
a) l/k
b) k/l
c) l/2k
d) k/2l

Explanation: It is a ratio of length to least radius of gyration.
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4. Columns with what slenderness ratio are not designed with respect to buckling but are designed for compressive stresses.
a) >1
b) <1
c) >30
d) <30

Explanation: When slenderness ratio is <30, there is no effect of buckling.

5. If slenderness ratio=45, which mode of failure will dominate?
a) Buckling
b) Compressive Stresses
c) Both buckling and compressive stress
d) Can’t be stated

Explanation: If slenderness ratio>30, column shall be more prone to buckling.

6. Short column and long column are classified on the basis of
a) Slenderness ratio
b) Diameter
c) Length
d) None of the listed

Explanation: Slenderness ratio takes into consideration length and radius of gyration and thus is preferred.

7. Cast iron column with a slenderness ratio of 75 are
a) Short Columns
b) Long Columns
c) Very short columns
d) None of the listed

Explanation: Cast iron column with a slenderness ratio <80are short columns.

8. Steel columns with a slenderness ratio of 95 are
a) Short Columns
b) Long columns
c) Very long columns
d) None of the listed

Explanation: Steel columns with slenderness ratio <100 are classified in short columns.

9. Which of the following are true for End fixity coefficient
a) Dimensionless number
b) Used in Euler’s equation
c) Provides condition of restraint at two ends
d) All of the listed

Explanation: It is a dimensionless number used in Euler’s equation to take into account the restraints at the two ends.

10. Value of end fixity coefficient for both hands fixed is
a) 1
b) 4
c) 2
d) 0.25

Explanation: Lower the mobility higher is the end fixity component.

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