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WorksheetsCivil war-Day 29-PWD-PSC,Design of retaining wall & water tank
Total questions: 10
Worksheet time: 10mins
Name
Class
Date
1.
A rectangular PSC beam (200 mm × 400 mm) is prestressed with a force of 400 kN at an eccentricity of 100 mm. Find the maximum compressive stress in concrete at midspan.
a)
2.5 N/mm²
b)
5.0 N/mm²
c)
7.5 N/mm²
d)
12.5 N/mm²
2.
In prestressed concrete, the purpose of introducing compressive stress before loading is —
a)
To reduce cracking under service loads
b)
To reduce reinforcement quantity
c)
To increase deflection capacity
d)
To improve aesthetics
3.
The minimum grade of concrete required for post-tensioned pre-stressed concrete (RCC) is
a)
M 30
b)
M 40
c)
M 20
d)
M 10
4.
In a post-tensioned concrete beam there was a slip of 5 mm in the cable at the jacking end. If the modulus of elasticity of steel cable is 210 kN/mm² and length of the beam is 30 m, then loss of stress in steel due to anchorage slip is
a)
3.5 N/mm²
b)
35 kN/mm²
c)
35 N/mm²
d)
0.35 kN/mm²
5.
The minimum cube strength of concrete used for a prestressed member, is ________
a)
50 kg/cm²
b)
150 kg/cm²
c)
100 kg/cm²
d)
350 kg/cm²
6.
In a post-tensioned beam, maximum frictional loss occurs —
a)
Near the jacked end
b)
At midspan
c)
Near the unjacked end
d)
Uniformly along the length
7.
In Pre-Tensioning process of prestressing, the tendons are:
a)
Bonded to the concrete
b)
Partially bonded to the concrete
c)
Not bonded to the concrete
d)
Generally bonded but sometimes remain unbonded to the concrete
8.
The main reinforcement in the heel of a cantilever R.C. retaining wall is provided on
a)
Top face
b)
Bottom face
c)
Does not require any reinforcement
d)
Side face
9.
What is the intensity of passive pressure at depth (h) with a uniform surcharge of (w) acting on the backfill?
a)
2Kp (γh + w)
b)
Kp (γh + w)
c)
Kp (γh)
d)
Kp (2γh + w)
10.
Which grade of concrete is commonly adopted for construction of water tanks?
a)
M30
b)
M40
c)
M45
d)
M10
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