Most recently Concrete Technology and Design of Concrete Structures Multiple choice Questions and Answers pdf

81. The limits of percentage p of the longitudinal reinforce-ment in a column is given by
a) 0.15% to 2%
b) 0.8% to 4%
c) 0.8% to 6%
d) 0.8% to 8%
Ans: c

82. The minimum diameter of longitudinal bars in a column is
a) 6 mm
b) 8 mm
c) 12 mm
d) 16 mm
Ans:c

83. The minimum cover to the ties or spirals should not be less than
a) 15 mm
b) 20 mm
c) 25 mm
d) 50mm
Ans: c

84. The load carrying capacity of a helically reinforced column as compared to that of a tied column is about
a) 5% less
b) 10% less
c) 5% more
d) 10% more
Ans:c

86.     The diameter of ties in a column should be
a) more than or equal to one fourth of diameter of main bar
b) more than or equal to 5 mm
c) more than 5 mm but less than one-fourth of diameter of main bar
d) more than 5 mm and also more than one-fourth of diameter of main bar
Ans: d

87. Due to circumferential action of the spiral in a spirally reinforced column
a) capacity of column is decreased
b) ductility of column reduces
c) capacity of column is decreased but ductility of column increases
d) both the capacity of column and ductility of column increase
Ans: d

88. Maximum percentage reinforcement in case of slabs is limited to
a) 2
b) 4
c) 6
d) 8
Ans: b

89. Which of the following R.C. retaining walls is suitable for heights beyond 6m?
a)    L-shaped wall
b) T-shaped wall
c) counterfort type
d) all of the above
Ans: c

90. For the design of retaining walls, the minimum factor of safety against overturning is taken as
a) 1.5
b) 2.0
c) 2.5
d) 3.0
Ans: b

91. In counterfort type retaining walls
i) the vertical slab is designed as a continuous slab
ii) the heel slab is designed as a conti¬nuous slab
iii) the vertical slab is designed as a cantilever
iv) the heel slab is designed as a cantilever
The correct answer is
a) (i) and (ii)
b) (i)and(iv)
c) (ii) and (iii)
d) (iii) and (iv)
Ans:a

92. A T-shaped retaining wall mainly conssits of
a) one cantilever
b) two cantilevers
c) three cantilevers
d) four cantilevers
Ans: c

93. In T-shaped R C. retaining walls, the main reinforcement in the stem is provided on
a) the front face in one direction
b) the front face in both directions
c) the inner face in one direction
d) the inner face in both directions
Ans:c

94. The main reinforcement in the toe of a T- shaped R C. retaining wall is provided on
i)    top face parallel to the wall
ii) top face perpendicular to the wall
iii) bottom face paralleUo the wall
iv) bottom face perpendicular to the wall
The correct answer is
a) only (ii) is correct
b) (i) and (ii) are correct
c) (iii) and (iv) are correct
d) only (iv) is correct
Ans: d

95. The temperature reinforcement in the vertical slab of a T-shaped R.C. retaining wall is
a) not needed
b) provided equally on inner and front faces
c) provided more on inner face than on front face
d) provided more on front face than on inner face
Ans: d

96. The main reinforcement in the heel of a T-shaped R.C. retaining wall is provided on
a) top face perpendicular to wall
b) bottom face perpendicular to wall
c) both top and bottom faces perpendi-cular to wall
d) none of the above
Ans: a

97. In a counterfort retaining wall, the main reinforcement is provided on the
i) bottom face in front counterfort
ii) inclined face in front counterfort
iii) bottom face in back counterfort
iv) inclined face in back counterEort
The correct answer is
a) (i) and (ii),
b) (ii) and (iii)
c) (i) and (iv)
d) (iii) and (iv)
Ans: c

98. In counterfort retaining walls, the main reinforcement in the stem at support is
a) not provided
b) provided only on inner face
c) provided only on front face
d) provided both on inner and front faces
Ans: b

99. In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on
i)    bottom face near counterfort
ii)   top face near counterfort
iii) bottom face near centre of span
iv)  top face near centre of span The correct answer is
a) only (i)
b) only (ii)
c) both (i) and (iv)
d) both (ii) and (iii)
Ans: c

100. In a counterfort retaining wall, the main reinforcement in the stem at mid span is provided on
a) front face only
b) inner face only
c) both front face and inner face
d) none of the above
Ans: a

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