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RCC Structures Design
Quiz 8
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Q.1
For a circular slab carrying a uniformly distributed load, the ratio of the maximum negative to maximum positive radial moment, is
1
2
3
5
Q.2
The maximum ratio of span to depth of a slab simply supported and spanning in one direction, is
35
25
30
20
Q.3
In a doubly-reinforced beam if ‘c’ and ‘t’ are stresses in concrete and tension reinforcement, ‘d’ is the effective depth and ‘n’ is depth of critical neutral axis, the following relationship holds good
mc/t = n/(d - n)
(m + c)/t = n/(d + n)
(t + c)/n = (d + n)/n
mc/t = (d - n)/t
Q.4
Pick up the assumption for the design of a pre-stressed concrete member from the following:
A transverse plane section remains a plane after bending
During deformation limits, Hook's law is equally applicable to concrete as well as to steel
Variation of stress in reinforcement due to changes in external loading is negligible
All the above
Q.5
Pick up the incorrect statement from the following:
In the stem of a retaining wall, reinforcement is provided near the earth side
In the toe slab of a retaining wall, reinforcement is provided at the bottom of the slab
In the heel slab of a retaining wall, reinforcement is provided at the top of the slab
None of these
Q.6
Pick up the correct statement from the following:
Lateral reinforcement in R.C.C. columns is provided to prevent the longitudinal reinforcement from buckling
Lateral reinforcement prevents the shearing of concrete on diagonal plane
Lateral reinforcement stops breaking away of concrete cover, due to buckling
All the above
Q.7
If jd is the lever arm and ΣO is the total perimeter of reinforcement of an R.C.C. beam, the bond stress at the section having Q shear force, is
Q/2jdƩO
Q/3jdƩO
Q/jdƩO
2 × Q/jdƩO
Q.8
The minimum head room over a stair must be
200 cm
205 cm
210 cm
230 cm
Q.9
The spacing of transverse reinforcement of column is decided by the following consideration.
The least lateral dimension of the column
Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column
Forty-eight times the diameter of transverse reinforcement
All the above
Q.10
‘P’ is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is ‘A’ and sectional modulus is ‘Z’. The maximum stress ‘f’ in the beam, subjected to a maximum bending moment ‘M’, is
f = (P/'+ (Z/M)
f = (A/P) + (M/Z)
f = (P/A) + (M/Z)
f = (P/A) + (M/6Z)
Q.11
The design of heel slab of a retaining wall is based on the maximum bending moment due to:
Its own weight
Weight of the soil above it
Load of the surcharge, if any
All the above
Q.12
If A
c
, A
sc
and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and σc are the modular ratio and maximum stress in the configuration of concrete, the strength of column is
σ
c
A
c
+ m σ
c
A
sc
σ
c
(A - A
sc
) + m σ
c
A
sc
σ
c
[A + (m - 1)A
sc
]
All the above
Q.13
If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm² and 1400 kg/cm² respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is
0.496 %
0.596 %
0.696 %
0.796 %
Q.14
A pile of length ‘L’ carrying a uniformly distributed load ‘W’ per metre length is suspended at the centre and from other two points 0.15 L from either end ; the maximum hogging moment will be
WL²/15
WL²/30
WL²/60
WL²/90
Q.15
Steel bars are generally connected together to get greater length than the standard length by providing
Straight bar splice
Hooked splice
Dowel splice
All the above
Q.16
If d and n are the effective depth and depth of the neutral axis respectively of a singly reinforced beam, the lever arm of the beam, is
d
n
d + n/3
d - n/3
Q.17
The allowable tensile stress in mild steel stirrups, reinforced cement concrete, is
1400 kg/cm²
190 kg/cm²
260 kg/cm²
230 kg/cm²
Q.18
In a singly reinforced beam, the effective depth is measured from its compression edge to
Tensile edge
Tensile reinforcement
Neutral axis of the beam
Longitudinal central axis
Q.19
The maximum ratio of span to depth of a cantilever slab, is
8
10
12
16
Q.20
An R.C.C. column is treated as long if its slenderness ratio is greater than
30
35
40
50
Q.21
The ratio of the breadth to effective depth of a beam is kept
0.25
0.50
0.70
0.75
Q.22
The steel generally used in R.C.C. work, is
Stainless
Mild steel
High carbon steel
High tension steel
Q.23
The advantage of reinforced concrete, is due to
Monolithic character
Fire-resisting and durability
Economy because of less maintenance cost
All the above
Q.24
If l₁ and l₂ are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w₁ and w₂ acting on strips parallel to l₂ and l₁ is
w₁/w₂ = l₂/l₁
w₁/w₂ = (l₂/l₁)²
w₁/w₂ = (l₂/l₁)³
w₁/w₂ = (l₂/l₁)⁴
Q.25
The minimum thickness of a flat slab is taken
L/32 for end panels without drops
L/36 for end panels without drops
L/36 for interior panels without drop
All the above
Q.26
Columns may be made of plain concrete if their unsupported lengths do not exceed their least lateral dimension
Two times
Three times
Four times
Five times
Q.27
The number of treads in a flight is equal to
Risers in the flight
Risers plus one
Risers minus one
None of these
Q.28
An R.C.C. column of 30 cm diameter is reinforced with 6 bars 12 mm φ placed symmetrically along the circumference. If it carries a load of 40,000 kg axially, the stress is
49.9 kg/cm²
100 kg/cm²
250 kg/cm²
175 kg/cm²
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