PSC Civil Engg: R.C.C & Pre-stress Concrete Quiz 4

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Question 1

The environmental exposure condition of concrete buried under aggressive sub soil or ground water is classified as

• Amoderate
• Bsevere
• Cvery severe
• Dextreme

Question 2

Consider the following statements related to limit state method.
Which one of the following is INCORRECT?

• AThe limit state of collapse is defined as the acceptable limit for the stresses in the materials.
• BLimit state method is one that ensures adequate safety of structure against collapse.
• CIn the limit state design method, actual stresses developed at collapse differ considerably from the theoretical values.
• DAll of the above

Question 3

A pre-stressed concrete rectangular beam of size 300 mm 900 mm is prestressed with an initial prestressing force of 700 kN at an eccentricity of 350mm at mid span. Stress at the top of the beam due to pre-stress alone in N/mm² is

• A-3.46 (tension)
• B2.59(compression)
• CZero
• D8.64(compression)

Question 4

The profile of the centroid of the tendon is parabolic with a central dip .Effective prestressing force is and the span is . The equivalent upward acting uniform load is

• A
• B
• C
• D

Question 5

When a spirally reinforced short column is loaded axially, the concrete inside the core is subjected to

• ABending and compression
• BBiaxial compression
• CTriaxial compression
• DUniaxial compression

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