Concrete Technology and Design

311. When shear stress exceeds the permissible limit in a slab, then it is reduced by

  1. Increasing the depth
  2. Providing shear reinforcement
  3. Using high strength steel
  4. Using thinner bars but more in number

Correct answer: (A)
Increasing the depth

312. Which of the following has high tensile strength?

  1. Plain hot rolled wires
  2. Cold drawn wires
  3. Heat treated rolled wires
  4. All have same tensile strength

Correct answer: (B)
Cold drawn wires

313. Which of the following losses of pre-stress occurs only in pre-tensioning and not in posttensioning?

  1. Elastic shortening of concrete
  2. Shrinkage of concrete
  3. Creep of concrete
  4. Loss due to friction

Correct answer: (A)
Elastic shortening of concrete

314. Which of the following R.C. retaining walls is suitable for heights beyond 6 m?

  1. L-shaped wall
  2. T-shaped wall
  3. Counterfort type
  4. All of the above

Correct answer: (C)
Counterfort type

315. Which of the following statements is incorrect?

  1. Minimum cross sectional area of longitudinal reinforcement in a column is 0.8%
  2. Spacing of longitudinal bars measured along the periphery of column should not exceed 300 mm
  3. Reinforcing bars in a column should not be less than 12 mm in diameter
  4. The number of longitudinal bars provided in a circular column should not be less than four

Correct answer: (D)
The number of longitudinal bars provided in a circular column should not be less than four

316. While compacting the concrete by a mechanical vibrator, the slump should not exceed

  1. 2.5 cm
  2. 5.0 cm
  3. 7.5 cm
  4. 10 cm

Correct answer: (B)
5.0 cm

317. While designing an air entrained concrete

  1. Water cement ratio is reduced
  2. Proportion of aggregates is reduced
  3. An allowance for the entrained air is made
  4. All the above

Correct answer: (D)
All the above

318. While designing the pile as a column, the end conditions are nearly

  1. Both ends hinged
  2. Both ends fixed
  3. One end fixed and other end hinged
  4. One end fixed and other end free

Correct answer: (C)
One end fixed and other end hinged

319. Workability improved by adding

  1. Fly ash
  2. Hydrated lime
  3. Calcium chloride
  4. All the above

Correct answer: (D)
All the above

320. Workability of concrete for a given water content is good if the aggregates, are

  1. Rounded aggregate
  2. Irregular aggregate
  3. Angular aggregate
  4. Flaky aggregates

Correct answer: (A)
Rounded aggregate

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