RCC Structures Design

111. If the modular ratio is'm', steel ratio 'r' is and overall depth of a beam is'd', the depth of the critical neutral axis of the beam, is

  1. [m/(m - r)] d
  2. [m/(m + r)] d
  3. [(m + r)/m] d
  4. [(r - m)/m] d

Correct answer: (B)
[m/(m + r)] d

112. If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is

  1. 0.00496
  2. 0.00596
  3. 0.00696
  4. 0.00796

Correct answer: (C)
0.00696

113. If the permissible compressive stress for a concrete in bending is C kg/m2, the modular ratio is

  1. 2800/C
  2. 2300/2C
  3. 2800/3C
  4. 2800/C2

Correct answer: (C)
2800/3C

114. If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by

  1. (5/6) (r/1 + r2) M
  2. (5/6) (r2/1 + r2) M
  3. (5/6) (r2/1 + r3) M
  4. (5/6) (r2/1 + r4) M

Correct answer: (D)
(5/6) (r2/1 + r4) M

115. If the ratio of the span to the overall depth does not exceed 10, the stiffness of the beam will ordinarily be satisfactory in case of a

  1. Simply supported beam
  2. Continuous beam
  3. Cantilever beam
  4. None of these

Correct answer: (C)
Cantilever beam

116. If the shear stress in a R.C.C. beam is

  1. Equal or less than 5 kg/cm2, no shear reinforcement is provided
  2. Greater than 4 kg/cm2, but less than 20 kg/cm2, shear reinforcement is provided
  3. Greater than 20 kg/cm2, the size of the section is changed
  4. All the above

Correct answer: (D)
All the above

117. If the sides of a slab simply supported on edges and spanning in two directions are equal, the maximum bending moment is multiplied by

  1. 0.2
  2. 0.3
  3. 0.4
  4. 0.5

Correct answer: (D)
0.5

118. If the size of a column is reduced above the floor, the main bars of the columns, are

  1. Continued up
  2. Bent inward at the floor level
  3. Stopped just below the floor level and separate lap bars provided
  4. All the above

Correct answer: (D)
All the above

119. If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge

  1. Is increased by PZ/e
  2. Is increased by Pe/Z
  3. Is decreased by Pe/Z
  4. Remains unchanged

Correct answer: (C)
Is decreased by Pe/Z

120. If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is

  1. Square
  2. Rectangular
  3. Trapezoidal
  4. Triangular

Correct answer: (B)
Rectangular

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