Applied Mechanics Question Paper of 3rd Semester Civil(D) Download Previous Years Question Paper 1

SB. Roll No. ................

APPLIED MECHANICS

3^rd Exam/Mech/5440/May09

Duration : 3 Hrs.       

1.                 Fill in the blanks

a.                 Two forces 3 N and 4 N act at right angles to each other, their resultant force will be _________

b.                 The apex angle of a cone of friction is 45°. The coefficient friction will be __________

c.                  ______ is the ration of load lifted to the effort  applied.

d.                 The product of a force and the perpendicular distance of the line of action of the force form a point is known a ____ of the force abut that point.

e.                  If a body is in equilibrium and is acted upon by two forces, then they must be equal, opposite and _____.

State true of false

I.                        All such forces whose lines of action are lying in one plane are called coplanar forces.

II.                        An ideal machine is one in which efficiency = 100%

III.                        The C.G. of a hemisphere lies at a distance of 3r/8 from its base along vertical radius ‘r;

IV.                        The force of friction developed between the surface of contact of two bodies in the position of rest, is static friction.

V.                        Rolling friction is more than sliding friction.

Section –B

Note : Attempt any five question

2.                   

a.                 What do you mean by rigid body?

b.                 Write briefly about principle of transmissibility of forces

c.                  State and prove lami’s theorem.

d.                 Derive the condition for irreversibility of a machine.

e.                  Differentiate between static friction and dynamic friction.

f.                   What is centre gravity?

g.                 What are conditions of equilibrium of a body?

Section –C

Note : Attempt any three questions

3.                 Two forces 2P & P respectively act an a particle. If the first force is doubled and second force increased by 120 N, the direction of resultant remains unchanged. Determine value of P.

4.                 A body consists of solid hemisphere of radius 4 cm and a right circular solid cone of height 12 cm. The hemisphere and cone have a common base and are made of the same material.

5.                 A uniform ladder of weight 250 N and length 5 m is places against a vertical wall in a position where its inclination of the vertical is 30°. A man weighting 800 N climbs the ladder. At what position will be induced slipping? The coefficient of friction of both the surfaces of contact of the ladder 10.2

6.                 A  load of 2.5 KN is to be lifted by a screw jack having threads of 10 mm pitch. The efficiency of the jack at this load is 50%. Determine effort applied at the end of a handle of 50 cm length.