MODEL Question paper for Elements of Civil Engineering

New Horizon College of Engineering (Autonomous)

I Semester B.E. Semester End Examination, November/December 2015

(Elements of Civil Engineering 15CV14)

Time: 3 Hrs Max. Marks: 100

PART A

Answer all Questions, Each Question carries 1 Mark

1. Concrete is a mixture of ……..a) Cement, sand, coarse aggregate, water b) Cement, sand, waterc) Sand, coarse aggregate, water d) None of these

2. Abutment is a part of …….a) Dam b) Bridge c) Road d) Building

3. The resultant of two forces P & Q is R. If Q is doubled, the new resultant is perpendicular to P,thena) P = Q, b) Q = R, c) Q = 2R, d) None of these

4. Component of a force at right angles to line of action is……..a) Zero b) Positive c) Negative d) None of these

5. Varignon’s theorem is not applicable to forces which are …..a) Coplanar non concurrent b) Non coplanar non concurrent c) Concurrent d) Parallel

6. The force which is equal and opposite to resultant is ____________________.a) Resultant force b) Force c) Equilibrant d) None of these

7. Two forces are acting at an angle of 120°. The larger force is 40 N and is perpendicular to smallerforce. The smaller force is ….a) 20 N b) 40 N c) 80 N d)None of these

8. The number of equations available for solving a beam supported by rollers at both the ends is….a) 1 b) 2 c)3 d) 4

9. If ϕ=angle of friction and a=angle of repose, then which relation is correct.a) ϕ = 1/a b) ϕ = a c) ϕ = tan a d) a = tan ϕ

10. When a body resting on an inclined plane slides down the plane under the action of its own weight,the angle of inclination of the inclined plane is…..

a)Greater than angle of repose b) Less than angle of reposec) Equal to angle of repose d) None of these

MODEL Question paper for Elements of Civil Engineering

11. The centroid of an equilateral triangle of side ‘a’ with a side parallel to the X axis is a) a/2, a/√6 b) a/2, a/√12 c) a/2, a/√24 c) a/3, a/3

12. The centroid of a circle of radius ‘r’ with its origin as axes is given by, a) r, r b) 0,0 c) 0, 4r/3π d) 4r/3π, 0

13. The unit of radius of gyration is.. a) mm b) mm2 c) kN-m d) mm4

14. The moment of inertia of a square of side ‘b’ about its centroidal axes isa) b4/8 b) b4/36 c) b4/12 d) b3/12

15. The minimum number of members to form a perfect truss is, a) 1 b)2 c)3 d)4

16. The polar moment of inertia of a circular area of diameter ‘D’ is,a) πD4/64 b) πD4/32 c) πD4/16 d)πD4/8

17. By means of a rope, a body of weight 100N is moved vertically upward with a constant accelerationof 2m/s2. Find the tensile force in the rope.

a) 0 N b) 100N c) 120N d) 150N

18. What is the inclination of a smooth inclined plane such that the accelerating force acting on a blocksliding down it may be g/2.

a) 300 b) 450 c) 600 d) 750

19. The work done on a body is zero if, a) There is no displacement of the body b) The resultant of forces acting on it is zero c) The displacement is perpendicular to the force d) All of these

20. When a body is lifted up, the work done by force of gravity is, a) Positive b) Negative c) Zero d) None of these

PART B

Answer any FIVE FULL QUESTIONS, selecting atleast ONE FULL question from each Module

Module 1

1.

a. Explain different types of bridges with neat sketches (10 Marks)

b. Write a note on: bricks, aggregates (06 Marks)

MODEL Question paper for Elements of Civil Engineering

OR

2.

a. Explain the principle of transmissibility of forces. Differentiate between resolution andcomposition of forces. (08 marks)

b. A vehicle is pulled by means of two ropes as shown in figure below. If the resultant pull is 1500N, find angle ϴ and force F. (08 Marks)

Module 2

3.

a. Three forces and a moment M = 6 Nm are applied on an angle bracket as shown in the figurebelow. Find the resultant force acting on the bracket & locate w.r.t point B. (06 Marks)

b. Two smooth cylinders each of weight 1000N and radius 15 cm connected at their centers by astring AB of length = 40cm, rest upon a horizontal plane and support above them a third cylinderof weight 2000N and radius 15 cm as shown in figure below. Find the force S in the string ABand also the reaction developed at contact points D and E. (10 Marks)

OR

MODEL Question paper for Elements of Civil Engineering

4.

a. Determine the reactions at the support for the beam loaded shown in fig. (06 Marks)

b. A beam ABCDE has a flexible link BC as shown in fig. determine the support reactions at A, D and E.

(10 Marks)

Module 3

5.

a. The ladder shown in the fig. is 4m long and is supported by a horizontal floor and a vertical wall. Thecoefficient of friction at the wall is 0.25 and at the floor is 0.5. The weight of the ladder is 200Nsupporting a vertical load of 1000N at C. Determine the reactions at A and B and compute the least valueof α at which, the ladder may be placed without slipping. (08 Marks)

b. A small block of weight 1000N is placed on a 30 deg incline with coefficient of friction 0.25 as shown infig. Find the horizontal force P required to be applied for impending motion down the plane andimpending motion up the plane. (08 Marks)

MODEL Question paper for Elements of Civil Engineering

OR

6.

a. Derive the formula for locating the centroid of triangle and quadrant of a circle. (08 Marks)

b. Locate the centroid of the lamina shown in fig. (08 Marks)

Module 4

7.

a. State and prove Perpendicular axis theorem (06 Marks)

b. Determine the radius of gyration about the centroidal axis for the lamina shown in fig. All dimensions arein mm. (10 Marks)

OR

8.

a. A pin joined truss is loaded and supported as shown in the fig. Determine forces in members BC, GF andCG and nature of forces. (08 Marks)

MODEL Question paper for Elements of Civil Engineering

b. Find the forces in all the members of the truss loaded as shown in the fig. Tabulate the results. (08 Marks)

Module 5

9.

a. State and explain D’Alembert’s principle. (06 Marks)

b. Two blocks of weight W1=150N and W2=500N are connected by an inextensible string as shown in fig.find acceleration of the blocks and tension in the string. The coefficient of friction between block W1 andsurface is 0.1 and between block W2 and surface is 0.2. (10 Marks)

OR

10.

a. Explain work energy principle. (06 Marks)

b. In the system of blocks shown in fig, if m1=8kg and m2=5kg, determine velocities of the blocks after theblock of mass m2 displaces by 2m. (10 Marks)

MODEL Question paper for Elements of Civil Engineering