Basic Civil Engineering Q&A - 4

• If one intends to obtain the best workability of concrete,the preferred shape of aggregate is
  • round
  • annular
  • triangular
  • flinty
  Answer — round

• Consider the common methods related to testing of concrete 1.Consistency
  2.Compacting factor
  3.Vee-Bee
  4.Setting time
  5.Slump
  Which of these methods refer to measuring workability of concrete?
  • 1,2 and 3
  • 1,2 and 5
  • 2,3 and 4
  • 2,3 and 5
  Answer — 2,3 and 5

• Gypsum is added into the raw materials during manufacture of cement so that the final product exhibits
  • retarded initial setting time
  • improved mouldability for cornices, etc.
  • increased compressive strength
  • augmented bond strength
  Answer — retarded initial setting time
  • If a material has identical elastic properties in all directions, it is said to be
    • elastic
    • isotropic
    • orthotropic
    • homogeneous
    Answer — isotropic
    • If
      A = Cross-sectional area
      E = Young’s modulus of elasticity
      G = Modulus of rigidity
      I = Moment of inertia
      J = Polar moment of inertia
      then torsional rigidity is given by
      • AE
      • GE
      • EI
      • GJ
      Answer — GJ
      • In a two-dimensional stress system,the radius of the Mohr’s circle represents
        • maximum normal stress
        • minimum normal stress
        • minimum shear stress
        • maximum shear stress
        Answer –maximum shear stress
        • The polar moment of inertia of the cross-section of the member is required to assess the strength of the member in
          • bending
          • torsion
          • axial force
          • shear
          Answer — torsion