PE civil exam – Geotechnical Question with correct
Answers
Void Ratio, e Correct Answer-or Vv/Vs
Porosity, n Correct Answer-or Vv/Vt
Saturation, S Correct Answer-or Vw/Vv
Dry unit weight (Ɣd) Correct Answer-
Wet unit weight (Ɣw) Correct Answer-
Specific Gravity (Gs) Correct Answer-
dry density (ρd) Correct Answer-Ws/Vt
OR
ρ / (1+w)
Water content, w Correct Answer-Ww/Ws
Truss Correct Answer-A truss is an assemblage of straight members
connected at their ends by flexible connections (pin-jointed) to form a
rigid configuration.
,Use of Truss Correct Answer-Trusses are widely used for applications
such as
supporting bridge decks, roofs of buildings, floor slabs, electricity
pylons, towers, domes etc.
Simple Truss (2D) Correct Answer-2D plain trusses e.g. bicycle frame
Planar truss Correct Answer-Consist of joining plane trusses
Space Frame Truss Correct Answer-3D framework
Pitched Truss Correct Answer-A truss having inclined top chords.
Flat truss Correct Answer-
Truss Members Correct Answer-
Types of connections in timber trusses Correct Answer-Metal plate and
bolts
Nail plate
Traditional method using Hardwood pegs
Types of connections in steel trusses Correct Answer-Bolts and nuts
(also rivets, but they are now rarely used)
, Welded joint
Plane truss determinacy calculations Correct Answer-m = 2j - r
m = number of members in the truss
j = number of joints in the truss
r = number of external reactions
Assumptions for analysis of Trusses Correct Answer-i. All members are
connected only at their ends by frictionless hinges ii. All loads and
support reactions are applied only at the joints
iii. The centroidal axis of each member coincides with the line
connecting the centers of the adjacent joints
iv. The dead weight of the truss members is distributed along its length;
hence it is ignored
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