# 250+ TOP MCQs on Effective Length and Slenderness Ratio of Compression Members and Answers

Design of Steel Structures Questions and Answers for Campus interviews on “Effective Length and Slenderness Ratio of Compression Members”.

1. Effective length of compression member is ________
a) distance between ends of members
b) distance between end point and midpoint of member
c) distance between points of contraflexure
d) distance between end point and centroid of member
Clarification: Effective length of compression member is distance between points of contraflexure. It should be derived from actual length and end conditions.

2. Magnitude of effective length depends upon
a) material of member
b) rotational restraint supplied at end of compression member
d) location where member is used
Clarification: Magnitude of effective length depends upon rotational restraint supplied at end of compression member and upon resistance to lateral movement provided.

3. Which of the following is true?
a) greater the effective length, greater the load carrying capacity
b) smaller the effective length, smaller the load carrying capacity
c) smaller the effective length, more the danger of lateral buckling
d) smaller the effective length, smaller the danger of lateral buckling
Clarification: Smaller the effective length of particular compression member, smaller is the danger of lateral buckling and greater is the load carrying capacity.

4. What is the effective length when both ends of compression member are fixed?
a) 0.65L
b) 0.8L
c) L
d) 2L
Clarification: The effective length of compression member when both ends of compression member are fixed is 0.65L (i.e. L/√2), where L is the length of the member.

5. What is the effective length when both ends of compression member are hinged?
a) 0.65L
b) 0.8L
c) L
d) 2L
Clarification: The effective length of compression member when both ends of compression member are hinged is L, where L is the length of the member.

6. What is the effective length when one end of compression member is fixed and other end is free?
a) 0.65L
b) 0.8L
c) L
d) 2L
Clarification: The effective length of compression member when one end is fixed and other end is free is 2L, where L is the length of the member.

7. What is the effective length when one end of compression member is fixed and other end is hinged?
a) 0.65L
b) 0.8L
c) L
d) 2L
Clarification: The effective length of compression member when one end is fixed and other end is hinged is 0.8L, where L is the length of the member.

8. What is slenderness ratio of compression member?
a) ratio of effective length to radius of gyration
b) ratio of radius of gyration to effective length
c) difference of radius of gyration and effective length
d) product of radius of gyration and effective length