Civil engineering Questions and solutions set - 3

Civil engineering Questions and solutions set - 3
Question:-
Option (A)
        zero
Option (B)
        320 kN-m (hogging)
Option (C)
        320 kN-m (Sagging)
Option (D)
        160 kN-m (hogging)
Correct Option:
B
Question Solution:
Ma = 0, Mc = 0
        Applying the theorem of three moments for the span AB and BC
        0 x 8 + 2 Mb(8 + 8) + (0 x 8) =
        32 Mb = 10240
        therefore, Mb = 320 kN-m (hogging)
Question:-
Option (A)
        2.09 N/mm2
Option (B)
        2.56 N/mm2
Option (C)
        2.82 N/mm2
Option (D)
        3.0 N/mm2
Correct Option:
A
Question Solution:
b = 300 mm
        d = 500 - 50 = 450 mm
        Ve = = 283.33 kN
        Shear stress = = 2.09 N/mm2
Question:-
Option (A)
        to minimise the amount of silt entering the branch canal
Option (B)
                        to let maximum silt be carried into the branch canal
Option (C)
                        for no specific purpose
Option (D)
                        to carry the canal across the drain
Correct Option:
A
Question:-
Option (A)
        52 kN/m2
Option (B)
        92 kN/m2
Option (C)
        28 kN/m2
Option (D)
        32 kN/m2
Correct Option:
D
Question Solution:
= σtotal - σartesian
        = (18 × 2 + 20 × 2 + 19 × 4) - 12 × 10 = 32 kN/m2
Question:-
Option (A)
        2976 kN
Option (B)
        2330 kN
Option (C)
        2852 kN
Option (D)
        2665 kN
Correct Option:
B
Question Solution:
Qg= Cu2NcAb + &αCu1.As1 + &αCu2As2
        = 80 x 9 x (0.7 + 0.3)2 + 0.6 [100 x 4 x (0.7 + 0.3) x 7
          + 80 x 4 x (0.7 + 0.3) x 3] = 2976 kN
        Also, Qg = QP x 4
        =
        = 2329.8 kN ≈ 2330 kN
        Lesser of two = Qsafe = 2330 kN
Question:-
Option (A)
        low pressure
Option (B)
        high pressure
Option (C)
        moderate pressure
Option (D)
        vacuum pressure
Correct Option:
C