USN 14qrv13 First semester B.E. Degree Examination, Dec.2Dl4lJan.2Dll Elements of Givil Engineering and Engineering Mechanics Time: 3 hrs. Max. Marks:100 Note: Answer FIVE fuII questions, selecting at lesst ONE questionfrom each part. PART _ I 1 a. Briefly explain the role of civil engineers in the infrastructural development. (10 Marks) b. In the triangle ABC, a force at 'A' produces a clockwise moment of 90 kN-m at B and an anticlockwise moment of 45 kN-m at C. Find the magnitude and direction of the force. (06 Marks) louu-^( ,.8 b. (.) o (J o. a a) c) '!2 a -o on cca O:: ol -O -! 3= oO boi ,6 s5 -O 6J -2. ts OE ?d) g6 tro. oj !, i; ao oE !o bo' cO0 o= o. ;j tr> :o 5" L,< rC\ (J z o o, Fig. Ql (b) c. Define force and its characteristics. (04 Marks) b. State and prove Varignon's theorem of moments. c. State and prove parallelogram law of forces. a. Determine the magnitude. direction of the resultant force for the Fig. Qa (a). Locate the resultant force with respect to point D. a. Explain the following with neat sketches: i) Principle of superposition of forces. ' ii) Principle of transmissibility of forces. iii) Couple and its characteristics. (10 Marks) b. Draw typical cross section of a road and explain the parts. (10 Marks) PART _ 2 a. Four co-planar forces acting at a point are shown in Fig. Q3 (a). One of the forces is unknown and its magnitude is shown by 'P'. The resultant has a magnitude of 500 N and is acting along the x-axis. Determine the unknown force 'P' and its inclination with x-axis. (08 Marks) (06 Marks) (06 Marks) force system as shown in (08 Marks) g=LG E*J k ,.AJ lo kN r1g. Q4 (a) Fig. Qa @) 26 kN force is the resultant of the two forces, one of which is as shown in Fig. Q4 (b). Determine the other force. (0&Marks) Explain the principle of resolved parts. (04 Marks) PART _ 3 Determine the reactions at contact points for spheres A, B and C as shown in Fig. Q5 (a). It is given that We: We :4 kN, Wc :6 kN, do = du = 500mm, d. = 800 mm (12 Marks) c. 5a. Fig. Q3 (a) Fig. Qa (a) tOO ,.r.J h*tn-{.-ltl-3r; Lnoo----i Fig. Qs (a) I of2 Fig. Qs (b)
First semester B.E. Degree Examination,
Dec.2Dl4lJan.2DllElements of Givil Engineering and Engineering
Mechanics
Time: 3 hrs. Max. Marks:100Note: Answer FIVE fuII questions,
selecting
at lesst ONE questionfrom each part.PART _ I
1 a. Briefly explain the role of civil engineers in the
infrastructural development. (10 Marks)b. In the triangle ABC, a
force at 'A' produces a clockwise moment of 90 kN-m at B and
ananticlockwise moment of 45 kN-m at C. Find the magnitude and
direction of the force.
