Concrete Technology and Design

51. Critical section for shear in case of flat slabs is at a distance of

  1. Effective depth of slab from periphery of column/drop panel
  2. d/2 from periphery of column/capital/ drop panel
  3. At the drop panel of slab
  4. At the periphery of column

Correct answer: (B)
d/2 from periphery of column/capital/ drop panel

52. Cube strength of controlled concrete to be used for pre-tensioned and post-tensioned work respectively should not be less than

  1. 35 MPa and 42 MPa
  2. 42 MPa and 35 MPa
  3. 42 MPa and 53 MPa
  4. 53 MPa and 42 MPa

Correct answer: (B)
42 MPa and 35 MPa

53. Curing

  1. Reduces the shrinkage of concrete
  2. Preserves the properties of concrete
  3. Prevents the loss of water by evaporation
  4. All of the above

Correct answer: (D)
All of the above

54. Curing a concrete for long period ensures better

  1. Volume stability
  2. Strength
  3. Water resistance
  4. All the above

Correct answer: (D)
All the above

55. Curing of pavements, floors, roofs and slabs, is done by

  1. Membrane method
  2. Ponding method
  3. Covering surface with bags
  4. Sprinkling water method

Correct answer: (B)
Ponding method

56. Diagonal tension in a beam

  1. Is maximum at neutral axis
  2. Decreases below the neutral axis and increases above the neutral axis
  3. Increases below the neutral axis and decreases above the neutral axis
  4. Remains same

Correct answer: (C)
Increases below the neutral axis and decreases above the neutral axis

57. Di-calcium silicate (C2S)

  1. Hydrates rapidly
  2. Generates less heat of hydration
  3. Hardens rapidly
  4. Provides less ultimate strength to cement

Correct answer: (B)
Generates less heat of hydration

58. Due to circumferential action of the spiral in a spirally reinforced column

  1. Capacity of column is decreased
  2. Ductility of column reduces
  3. Capacity of column is decreased but ductility of column increases
  4. Both the capacity of column and ductility of column increase

Correct answer: (D)
Both the capacity of column and ductility of column increase

59. Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to

  1. Deflect downward
  2. Deflect upward
  3. Deflect downward or upward
  4. None of the above

Correct answer: (A)
Deflect downward

60. During erection, the pile of length 'l' is supported by a crane at a distance of

  1. 0.207 l
  2. 0.293 l
  3. 0.707 l
  4. 0.793 l
    From the driving end of pile which rests on the ground

Correct answer: (C)
0.707 l

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