elements of civil engineering jan 2014

8/12/2019 Elements of Civil Engineering Jan 2014

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USN 10crv13/23First/Second Semester B.E. Degree Examination, Dec.2013 /Jan.2Dl4Elements of Givil Engineering and Engineering Mechanics

Time: 3 hrs. Max. Marks:100Note: l. Answer any FIW full questions, choosing at least two from each part.' ,, 2. Answer all objective lype questions only in OMR sheet page 5 of the onswer booklel, 3. Answer to objective ltpe questions on sheets other than OMR will not be valaed.

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'iaOn?()so-o -l'a=AEo5.v>\ (FoooEOO()=*otr>olr8ry,6.Determine its components normal to and parallel to the inclined plane. The plane makes anangle of 20o with the horizontal. . (04 Marks). A body is subjected to the tkee forces as shown in Fig.Q2(c). If possible determine thedirection of the force "F" so that the resultant is in 'x' direction, when (i) F : 5000 N,c,

3a.( ii) F : 3000 N.Choose the correct answers for the following :i) In case ofcoplanar concurrent force the resultant force passes through

(12 Marks)(04 Marks)

A) point of concurrenceC) different plane B) away from point of concurrenceD) none of theseii) If two concurrent forces each of 'P' act at right angles to each other, their resultant isA) 2P B)P Q JiP D 2JPiii) If IV : 0 and IU: 0 for a coplanar nonconcurrent force system, then it is inA) equilibrium B) translation C) rotation D) none of theseir) Conditions of equilibrium for a coplanar concurrent force system isA) one B) two C) three D) four

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10crv13/23b. Two forces acting on a body are 500 N and 1000 N as shown in Fig.Q3(b). Determine thethird force "F" such that the resultant of all the three forces is 1000 N directed at 45o to 'x'axls. (06 Marks)c. Determine the resultant of the four forces acting on a body as shown in Fig.Q3(c) withrespect to point "O".

4 a. Choose the correct answers for the following :(10 Marks)(04 Marks)i) The centroid of a triangle of height 'h' is located at a distance from its apex.A) W2 B) 2W3 c) h/3 D)hii) Intersection of _ number of symmetrical axes will give centroid of plane area.A)3 B)4 c)2 D) none of theseiiil Moment of an area about a reference axis passing through its centroid isA) maximum B) minimum C) zero D) none of theseiv) Centroid of a semicircle from an axis passing through the diameter is

D)113r(06 Marks)the Fig.Qa(c) with respect to OX and(10 Marks)Determine the centroid of the shaded area shown in

PART - qChoose the correct answers for the following : '

A) JL'3n B) a4n C)I4rb. Determine the centroid of a semi-circular lamina of radius "r" by the method of integration.c.

5a. (04 Marks)i) If three forces are acting at'a point and are in equilibrium, out of which two are actingin the same line, then the third foree isA) maximum B) minimum C) zero D) none of theseii) A rigid body is in equilibrium if the resultant force of concurrent tbrce system isA) positive B) negative C) zero D) none oftheseiii) Lami's theorem is valid for number o.f concurrent forces in equilibrium.D) none of these

A) equilibriant B) similar force C) opponent force D) none of theseState and prove Lami's theorem. (06 Marks).

c.

A) two B) three C) fouriv) The force equal and opposite to resultant is called asThe frictionlesS pulley 'A' shown in Fig.Q5(c) is supplied by two bars AB and AC whichare hinged &t 'B' and 'C' to a vertical wall. The flexible cable DG hinged at 'D', goes overthe pulley afid supports a load of 20 kN at 'G'. The angles between the various members areshown in the figure. Determine the forces in the bars AB and AC. Neglect the size andweight of the pulley.

6 a. Choose the correct answers for the following :(10 Marks)(04 Marks)

D) none oftheseD)4

c) 3 D)4B) Uniform dead loadD) Uniform diameter loadat 'A' and is free at 'B'. Determine the

(06 Marks)

i) A hinged support can have reactions.A)2 B)4 c)lii) A determinate beam can have number of unknowns.A)2 B)3 c)1iii) A fixed support can have _ reactions.A)1iv) udl stands forA) Uniformly distributed loadC) Uniform door loadThe cantilever beam shown in Fig.Q6(b) is fixedreaction when it is loaded as shown.

B)2

b.

c. Find the forces in all the members of the truss loaded s shown in the Fig.6(c). Tabulate theresults. (10 Marks)

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3/4

a. Choose the correct answers for the following :i) Compared to static liiction, kinetic friction isA) greater B) smaller C) very largeii) Friction force is to the contact surface between bodies.A) parallel B) perpendicular C) tangentialiii) Friction force is a force.A) active B) passive C) normaliv) The tangent of the angle of friction is B) coefficient of frictionD) limiting friction

10cIv13/23(04 Marks)

D) zeroD) none of theseD) none of these

(10 Marks)

(04 Marks)D) m'D) -o

A) angle of reposeC) cone of friction

surfaces is 0,20.

8 a. Choose the corredt axswers for the following :i) Unit of second moment of area isB) *'

b. Defite: i) Angle of friction; ii) Coefhcient of friction; iii) Cone of friction. (06Marks)c. What is the value of 'P' in the system shown in Fig.Q7(c), to cause the rnetion to impend tothe right? Assume the pulley is smooth and coefhcient of friction between the other contact

ii) Unit of radius of gliration is _.A)m B)-'t4B) -8

A)miii) Moment of inertia of a square of side 'b' about an axis through its centroid is

boA)-12iv) P6ns lrlolrent of inertia isA) Ir* + Iyl B) I,* + 1,,centroidal X-X and Y-Y axis.

ElDd5d,.J,

c) moc) ,r,'c) 436C) I, + I,,

D) q12D) none of theseb. Define: i) Moment of inertia; ii) Radius of gyration; iii) Polar moment of inertia. (06 Marks)c. Determine the moment of inertia of the symmetrical I-section shown in Fig.Q8(c) about its(10 Marks)

Fie.Q2(b)Fig.Q2(c)

lfio$l

Fig.Q3(c)ie.Q3(b)

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