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101. |
Creep of concrete in a structural member is due to |
A. | elastic strain |
B. | elasto-plastic strain |
C. | inelastic strain |
D. | plastic strain |
Answer» C. inelastic strain |
102. |
Shrinkage of concrete in a structural member is due to |
A. | dead load on the member |
B. | live load |
C. | loss of moisture and drying of concrete |
D. | both a and b |
Answer» C. loss of moisture and drying of concrete |
103. |
Modulus of elasticity of concrete is generally expressed in terms of |
A. | shear strength |
B. | compressive strength |
C. | tensile strength |
D. | torsional strength |
Answer» B. compressive strength |
104. |
Target mean strength of concrete depends upon |
A. | water/cement ratio |
B. | type of aggregate |
C. | characteristic strength of concrete |
D. | all of the above |
Answer» C. characteristic strength of concrete |
105. |
Workability of concrete is influenced significantly by |
A. | target mean strength |
B. | water/cement ratio |
C. | type of cement |
D. | all of the above |
Answer» B. water/cement ratio |
106. |
High-tensile steel is basically |
A. | low carbon steel |
B. | high manganese steel |
C. | high carbon steel |
D. | low nickel steel |
Answer» C. high carbon steel |
107. |
The creep coefficient depends upon the |
A. | span of the structural member |
B. | notional size of the member |
C. | depth of the member |
D. | none of the above |
Answer» B. notional size of the member |
108. |
In the case of prestressing steels, the highest stress is reached in |
A. | high-tensile steel wires |
B. | high-tensile steel bars |
C. | high-tensile strands |
D. | all of the above |
Answer» C. high-tensile strands |
109. |
In pretensioning system |
A. | the member is cast fist followed by tensioning of high-tensile wires |
B. | the member is prestressed by external anchors |
C. | the high-tensile wires are tensioned before placing concrete in forms |
D. | none of the above |
Answer» C. the high-tensile wires are tensioned before placing concrete in forms |
110. |
Curved cables can be used in |
A. | pretensioned members |
B. | externally pretressed member |
C. | post-tensioned member |
D. | all of the above |
Answer» C. post-tensioned member |
111. |
In long line method or pretensioning, |
A. | only one member can be cast |
B. | two members can be cast |
C. | several members can be cast |
D. | none of the above |
Answer» C. several members can be cast |
112. |
In post-tensioning system |
A. | wires are fist tensioned followed by concreting |
B. | tensioning of wires and concreting is simultaneously done |
C. | the wires are tensioned against hardened concrete |
D. | none of the above |
Answer» C. the wires are tensioned against hardened concrete |
113. |
Freyssinet system is based on the principle of |
A. | direct bearing on concrete from bolt heads at the end of wires |
B. | looping of the wires around concrete |
C. | wedge action producing frictional grip between steel and concrete |
D. | all of the above |
Answer» C. wedge action producing frictional grip between steel and concrete |
114. |
High-tensile bars threaded at ends are used in |
A. | freyssinet system |
B. | gifford–udall system |
C. | lee–mccall system |
D. | all of the above |
Answer» C. lee–mccall system |
115. |
Looping of high-tensile tendons around the concrete is used in |
A. | bbrv system |
B. | magnel–blaton system |
C. | baur–leonhardt system |
D. | none of the above |
Answer» C. baur–leonhardt system |
116. |
Tendon splices are required in |
A. | hoyer’s long line method of pretensioning |
B. | short span prestressed members |
C. | long span continuous members |
D. | all of the above |
Answer» C. long span continuous members |
117. |
In prestressed members requiring very large forces, the tendons preferred are |
A. | wires |
B. | bars |
C. | strands |
D. | none of the above |
Answer» C. strands |
118. |
The tendon splice preferred in the case of long span continuous prestressed members is |
A. | wrapped splice |
B. | clamp splice |
C. | torpedo splice |
D. | none of the above |
Answer» C. torpedo splice |
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