Engineering Questions with Answers - Multiple Choice Questions
Shallow Foundations – Settlement of Footings
1 - Question
The total settlement of a footing in clay is considered to be consisting of ___________ components.
a) One
b) Three
c) Two
d) Four
View Answer
Answer: b
Explanation: According to Skempton and Bjerrum, the total settlement of a footing in clay may be considered to consist of three components
S = Si + Sc + Ss.
2 - Question
The component Sc, used in the total settlement of clay refers to which of the following?
a) Total settlement
b) Consolidation settlement
c) Immediate plastic settlement
d) Settlement due to secondary consolidation of clay
View Answer
Answer: b
Explanation: The three components used in total settlement of clay are given below:
Sc = consolidation settlement
Si = immediate elastic settlement
Ss = settlement due to secondary consolidation of clay.
3 - Question
The immediate settlement can be computed from the expression, based on ____________
a) Theory of plasticity
b) Theory of elasticity
c) Terzaghi’s analysis
d) Pressure distribution
View Answer
Answer: b
Explanation: The immediate settlement is the elastic settlement and can be computed from the following expression based on the theory of elasticity,
Si = q B (1-μ2/E s) I w.
4 - Question
The influence factor for rigid square footing is ____________
a) 0.88
b) 0.82
c) 1.06
d) 1.70
View Answer
Answer: b
Explanation: As suggested by BIS Code IS: 8009 Part 1, 1976 the value of influence factor Iw for rigid footing is 0.82.
5 - Question
The equation for computing immediate settlement “Si = μ0μ1 q B ( 1-μ2/Es )” was proposed by ___________
a) Janbu
b) Bjerrum
c) Kjaernsli
d) All of the mentioned
View Answer
Answer: d
Explanation: In 1966, Janbu, Bjerrum, and Kjaernsli have proposed the following equation for computing the immediate settlement:
Si = μ0μ1 q B (1-μ2/Es).
6 - Question
The value of Es used in the immediate settlement equation, can be found out using _____________
a) Triaxial test
b) Compression test
c) Direct shear test
d) Rankine’s theory
View Answer
Answer: a
Explanation: The modulus of elasticity Es used in the equation Si = μ0μ1 q B (1-μ2/Es) is computed from triaxial test data, where
Es = (σ1-σ3)/ΔL / L.
7 - Question
A combined footing may be rectangular in shape if both the columns carry ___________
a) Unequal loads
b) Equal loads
c) No load
d) All of the mentioned
View Answer
Answer: b
Explanation: The combined footing may be rectangular in shape if both the columns carry equal loads, or may be trapezoidal if they carry unequal loads.
8 - Question
The influence factor Iw for rigid rectangular footing with L/B = 1.5 is ____________
a) 0.88
b) 0.82
c) 1.70
d) 1.06
View Answer
Answer: d
Explanation: Iw = influence factor = 1.06 for rigid rectangular footing, with L/B = 1.5 = 1.70 for rigid rectangular footing, with L/B = 5.