Engineering Questions with Answers - Multiple Choice Questions
Strength of Materials MCQs Design of Columns
1 - Question
Eccentrically loaded columns have to be designed for combined axial and ________
a) Shear force
b) Bending moments
c) Torsion
d) Creep
View Answer
Answer: b
Explanation: When the line of action of the resultant force doesn’t coincide with the axis of centre of gravity then it is called eccentrically loaded column. An eccentrically loaded column has to be designed for combined axial force and bending moments.
2 - Question
What is the recommended value of effective length if the column is effectively held in position and fixed against rotation in both ends?
a) 0.8 l
b) 0.5 l
c) 0.65 l
d) 0.9 l
View Answer
Answer: c<br />
Explanation: Effectively held in position and fixed against rotation in both ends is 0.65 l.
| End Positions Of a Column | Value of effective length |
| Effectively held in position and fixed against rotation in both ends | 0.65 × l |
| Effectively held in position at both ends but not restrained against rotation | 1.00 × l |
3 - Question
What is the minimum value of eccentricity provided in columns?
a) 50 mm
b) 20 mm
c) 30 mm
d) 45 mm
View Answer
Answer: c
Explanation: No column can have a perfectly axial load. There may be some moments acting due to imperfection of construction or due to actual conditions of loading. Hence IS 456 -2000, recommend eccentricity of 20 mm.
4 - Question
The strength of the column with helical reinforcement shall be ____ times the strength of similar column with lateral ties.
a) 2.0
b) 1.05
c) 3
d) 1.5
View Answer
Answer: b
Explanation: The strength of column with helical reinforcement Shall be 1.05 times the strength of similar column with lateral ties, provided the ratio of the volume of helical reinforcement to the volume of the core shall not be less than 0.36(Ag/Ak – 1) fck/fy.
5 - Question
The minimum diameter provided for the longitudinal bars is ________
a) 15 mm
b) 20 mm
c) 12 mm
d) 18 mm
View Answer
Answer: c
Explanation: The minimum diameter of the longitudinal bars provided in the column is 12 mm and the spacing of longitudinal bars measured along the periphery of the column shall not exceed 300 mm.
6 - Question
What is the minimum number of longitudinal bars provided in the rectangular column?
a) 4
b) 5
c) 6
d) 8
View Answer
Answer: a
Explanation: According to IS 456-2000, clause 26.5.3, the minimum number of longitudinal bars to be provided is 4 for rectangular columns and the minimum number of longitudinal bars to be provided for circular columns is 6.
7 - Question
The ends of ________ shall be properly anchored.
a) Longitudinal reinforcement
b) Transverse reinforcement
c) Torsional reinforcement
d) Shear reinforcement
View Answer
Answer: b
Explanation: The effective lateral support is given by transverse reinforcement either in the form of circular rings or by lateral ties. The ends of transverse reinforcement shall be properly anchored.
8 - Question
For longitudinal reinforcing bar, the nominal cover should not be less than ___________
a) 30 mm
b) 20 mm
c) 40 mm
d) 50 mm
View Answer
Answer: c
Explanation: According to IS 456-2000, clause 26.4.2.1, the nominal cover for longitudinal reinforcing bars in any case shall not be less than 40 mm or less than the diameter of such bar.
9 - Question
Which of the following reservoirs is also known as ___________
a) Ground service reservoirs
b) Elevated reservoirs
c) Over head reservoirs
d) Storey reservoirs
View Answer
Answer: a
Explanation: Ground service reservoirs are constructed at ground level and mainly used to store water. They are generally constructed with masonry (or) RCC slab. These are also known as surface reservoirs or not elevated reservoirs.
10 - Question
A system in which water is supplied only for fixed few hours, such system is called ____
a) Closed
b) Intermittent
c) Combined
d) Lift
View Answer
Answer: b
Explanation: In the intermittent system, the water is supplied only for a few hours the system is adopted when adequate water from the source is not available. The system is widely adopted by much local water authority it is functioned through phases.
11 - Question
In ___________ system, air relief valves are not required.
a) Gravity
b) Intermittent
c) Continuous
d) Grid
View Answer
Answer: c
Explanation: In the continuous system, the supply of water is 24 hours a day. This is the most ideal system and is adopted when plenty of water is available. As the water doesn’t get contaminated and circulating at uniform pressure, air relief valves are not required essentially.
12 - Question
Which of the following is one of the layouts of distribution systems?
a) Dual system
b) Gravity system
c) Grid Iron system
d) Pressure system
View Answer
Answer: c
Explanation: In grid iron systems, there are no dead ends hence stagnation of water and its consequences are eliminated. The water is kept in good circulation due to the absence of dead ends. The system is suitable for well planned towns.
13 - Question
Which of the following system is also known as an interlaced system?
a) Tree system
b) Grid iron system
c) Circle system
d) Radial system
View Answer
Answer: b
Explanation: Grid iron system is an improvement over the tree system. In the system, the mains, sub lines and branches are interconnected with each other. This system is also known as interlaced or reticulation system.
14 - Question
Which of the following is also known as a ring system?
a) Circle
b) Reticulation
c) Radial
d) Interlaced
View Answer
Answer: a
Explanation: In a circle system, the entire locality is divided into either rectangular (or) circular blocks. The water mains are laid along the peripheral roads with sub mains branching out from mains. This system is also known as ring system.
15 - Question
Varignon’s theorem is called as _________
a) Principle of Forces
b) Principle of moments
c) Principle of points
d) Theory of couple
View Answer
Answer: b
Explanation: Varignon’s theorem states that “the moment of a force about any point is equal to the sum of moments of the components about the same point”. This principle is also known as the principle of moments.
R.r = P.p + Q.c
Where P, Q are forces and R is resultant.
“c” is the perpendicular distance of Q.