RCC Structures Design

131. In a pre-stressed member it is advisable to use

  1. Low strength concrete only
  2. High strength concrete only
  3. Low strength concrete but high tensile steel
  4. High strength concrete and high tensile steel

Correct answer: (D)
High strength concrete and high tensile steel

132. In a simply supported slab, alternate bars are curtailed at

  1. 1/4th of the span
  2. 1/5th of the span
  3. 1/6th of the span
  4. 1/7th of the span

Correct answer: (D)
1/7th of the span

133. In a singly reinforced beam

  1. Compression is borne entirely by concrete
  2. Steel possesses initial stresses when embedded in concrete
  3. Plane sections transverse to the centre line of the beam before bending remain plane after bending
  4. Elastic moduli for concrete and steel have different values within the limits of deformation of the beam

Correct answer: (C)
Plane sections transverse to the centre line of the beam before bending remain plane after bending

134. In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called

  1. Under-reinforced section
  2. Over reinforced section
  3. Economic section
  4. Critical section

Correct answer: (B)
Over reinforced section

135. In a singly reinforced beam, the effective depth is measured from its compression edge to

  1. Tensile edge
  2. Tensile reinforcement
  3. Neutral axis of the beam
  4. Longitudinal central axis

Correct answer: (B)
Tensile reinforcement

136. In a slab, the pitch of the main reinforcement should not exceed its effective depth

  1. Three times
  2. Four times
  3. Five times
  4. Two times

Correct answer: (B)
Four times

137. In case the factor of safety against sliding is less than 1.5, a portion of slab is constructed downwards at the end of the heel slab, which is known as

  1. A key
  2. A cut-off wall
  3. A rib
  4. All the above

Correct answer: (D)
All the above

138. In favourable circumstances a 15 cm concrete cube after 28 days, attains a maximum crushing strength

  1. 100 kg/cm2
  2. 200 kg/cm2
  3. 300 kg/cm2
  4. 400 kg/cm2

Correct answer: (D)
400 kg/cm2

139. In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed

  1. 10 mm
  2. 15 mm
  3. 20 mm
  4. 25 mm

Correct answer: (D)
25 mm

140. In the zone of R.C.C. beam where shear stress is less than 5 kg/cm2, nominal reinforcement is provided at a pitch of

  1. One-half lever arm of the section
  2. One-third lever arm of the section
  3. Lever arm of the section
  4. One and half lever arm of the section

Correct answer: (C)
Lever arm of the section

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