CECOS UNIVERSITY OF IT AND EMERGING SCIENCESDEPARTMENT OF CIVIL ENGINEERING

Engineering Mechanics1st Semester (CE-2014)

FINAL PAPER, JAN, 2015ROLL .NO SEC

Note: - Use of mobile phones and programmable calculator is not allowed. Attempt all questions, all questions carry equal marks, solve PART – 1 on the question paper.

PART – 1

Time allowed = 20 min (MAX MARKS = 20)

Q .NO. 1) Multiple Choice Questions.

1) The forces exerted by bodies on one another by remote action, without physical contact are called

a) Contact forces b) body forcesc) Distributed forces d) none of these

2) The no. of equilibrium equations per joint of a plane truss is a) 3 b) 2 c) 4 d) 1

3) A particle is an object having a) Mass but no volume b) both mass and volumec) Volume but no mass d) none of these

4) Velocity of a rigid body moving along a straight line is denoted by a a) Sliding vector b) fixed vectorc) Free vector d) unit vector

5) A rigid bar lying along x-axis, with a force exerted along y-axis the moment will be produceda) About x-axis b) about y-axisc) About an arbitrary axis d) about z axis

6) The basis for application of parallelogram law isa) Conditions of equilibrium b) newton’s law of motion

c) Principle of transmissibility d) Verignon’s theorem 7) Cables and strings have

a) Both compression and tension b) Tension onlyc) Compression only d) Flexure

8) The internal static indeterminacy of a truss can be increased bya) By eliminating a support b) eliminating a memberc) Providing additional member d) providing extra support

9) Equilibrium equations cannot be used to find the unknowns ifa) The no. of unknowns is less than no. of equilibrium equationsb) The no. of unknowns is more than no. of equilibrium equationsc) The no. of equations is equal to no. of equilibrium equationsd) Both a) and c).

10) If the density is not uniform throughout the body the position of centroid and center of mass is a) Identical b) does not coincide

CECOS UNIVERSITY OF IT AND EMERGING SCIENCESDEPARTMENT OF CIVIL ENGINEERING

c) center of mass is above centroid d) center of gravity is not related to densityEngineering Mechanics1st Semester (CE-2014)

FINAL PAPER, JAN, 2015

PART – 2Time allowed = 2 hrs. 40 min (MAX MARKS = 80)

---------------------------------------------------------------------------------------------------------------------------------Q .NO. 2)

a) State principle of transmissibility and write down its significance.b) The plate as shown in fig-1 is subjected to the forces at A and B as shown. If θ = 500

determine the magnitude of the resultant of these two forces and its direction measured clockwise from the horizontal.

Fig-1Q .NO. 3)

a) Differentiate between internal and external static indeterminacy?b) Three cables are joined at the junction ring C. Determine the tension in the cables AC and BC caused by the weight of 30 kg cylinder.

CECOS UNIVERSITY OF IT AND EMERGING SCIENCESDEPARTMENT OF CIVIL ENGINEERING

Fig-2

Q .NO. 4)a) Differentiate between plane truss and space truss.b) Analyze the given truss by the method of joints and show the forces on a neat sketch.

P1 = 600 lb P2 = 400 lb

Fig-3Q .NO. 5)

a) Define i. Shear force ii. Bending moment

iii. Torsion. iv. Center of massb) Analyze the given beam and draw the shear force and bending moment diagram, also find the Maximum moment and its location.

Fig-4

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CECOS UNIVERSITY OF IT AND EMERGING SCIENCESDEPARTMENT OF CIVIL ENGINEERING