design of concrete structures MCQs – Page 7

Practise focused design of concrete structures questions with marked answers for exam preparation and subject revision.

design of concrete structures Mcqs
121. Stress strain curve of high tensile steel_______________?
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A. does not show definite yield point but yield point is defined by 2% proof stress

B. does not show definite yield point but yield point is defined by 0.1% proof stress

C. has a definite yield point

D. does not show definite yield point but yield point is defined by 0.2% proof stress
122. Which of the following has high tensile strength ?
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A. heat treated rolled wires

B. plain hot rolled wires

C. cold drawn wires

D. all have same tensile strength

123. According to ISI recommendations, the maximum depth of stress block for balanced section of a beam of effective depth d is__________________?
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A. 0.55 d

B. 0.43 d

C. 0.68 d

D. 0.85 d

124. Select the incorrect statement?
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A. For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pretensioning system

B. none of the above

C. Pretensioning system has greater certainty about its durability.

D. The loss of prestress is more in pre-tensioning system than in post-tensioning system.

125. Examine the following statements ___________?
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A. pan style="color: #003f1a;">4. Factor of safety for concrete should be based on its ultimate stress.
B. pan style="color: #003f1a;">2. Factor of safety for steel should be based on its ultimate stress,
C. pan style="color: #003f1a;">3. Factor of safety for concrete should be based on its yield stress,
D. an style="color: #003f1a;">1. Factor of safety for steel should be based on its yield stress,

E. correct statements are

126. The critical section for finding maximum bending moment for footing under masonry wall is located_______________?
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A. halfway between the middle and edge of the wall

B. at the edge of the wall

C. at the middle of the wall

D. at a distance equal to effective depth of footing from the edge of the wall

127. According to Whitneys theory, depth of stress block for a balanced section of a concrete beam is limited to_______________?
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A. 0.85 d

B. 0.68 d

C. 0.537 d

D. 0.43 d

128. The purpose of reinforcement in prestressed concrete is________________?
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A. all of the above

B. to impart initial compressive stress in concrete

C. to resist tensile stresses

D. to provide adequate bond stress

129. Ultimate strength of cold drawn high steel wires_______________?
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A. increases with increase in diameter of bar

B. does not depend on diameter of bar

C. decreases with increase in diameter of bar

D. none of the above

130. Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than__________________?
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A. 35 MPa and 42 MPa

B. 42 MPa and 53 MPa

C. 42 MPa and 35 MPa

D. 53 MPa and 42 MPa

131. Most common method of prestressing used for factory production is________________?
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A. Lee-Macall system

B. Magnel-Blaton system

C. Freyssinet system

D. Long line method
132. Prestress loss due to friction occurs________________?
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A. only in post-tensioned beams

B. only in pretensioned beams

C. in both post-tensioned and preten-sioned beams

D. none of the above

133. In a spherical dome the hoop stress due to a concentrated load at crown is_______________?
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A. compressive everywhere

B. partly compressive and partly tensile

C. tensile everywhere

D. zero

134. In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively_______________?
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A. compressive and tensile

B. tensile and compressive

C. both compressive

D. both tensile

135. Select the incorrect statement?
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A. Bleeding can be minimized by adding pozzuolana finer aggregate

B. Bleeding can be increased by addition of calcium chloride

C. none of the above

D. Lean mixes bleed more as compared to rich ones

136. In counterfort type retaining walls_____________?
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A. e="color: #003f1a;">2. the heel slab is designed as a continuous slab
B. e="color: #003f1a;">4. the heel slab is designed as a cantilever

C. correct answer is?

D. e="color: #003f1a;">3. the vertical slab is designed as a cantilever
E. ="color: #003f1a;">1. the vertical slab is designed as a continuous slab
137. In a counterfort retaining wall, the main reinforcement is provided on the_______________?
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A. e="color: #003f1a;">4. inclined face in back counterEort

B. correct answer is

C. e="color: #003f1a;">3. bottom face in back counterfort
D. e="color: #003f1a;">2. inclined face in front counterfort
E. ="color: #003f1a;">1. bottom face in front counterfort