Vinayaka Missions University 2007 B.E Computer Science BASIC ENGINEERING MECHANICS,MODEL - Question Paper

VINAYAKA MISSION'S UNIVERSITY
V.M.K.V ENGINEERING COLLEGE, SALEM

MODEL examination

Name of the Subject: BASIC ENGINEERING MECHANICS
Branch / Semester : Mech / I-Year Non Sem.
Common to : Subject Code:
Date of examination : Session: Time: three hours
Maximum Marks: 80

ans All ques.
Part – A (10 x two = 20 Marks)
1. Define Hooke’s legal regulations.
2. Define Poisson’s ratio?
3. Describe the classification of force system
4. State varignon’s theorem of moments
5. What are the sign conventions used for shear force and bending moment in general?
6. What is mean by point of contraflexure?
7. State D’Alembert’s principle.
8. Define Angle of repose.
9. Define kinematic chain.
10. Differentiate ranging from open and closed coiled helical springs.

Part – B (5 x 12 = 60 Marks)
11. (a). A steel rod three cm diameter and five m long is connected to 2 grips and the rod is maintained at a temperature of 95ºC. Determine the stress and pull exerted when the temperature falls to 30ºC. If (i) the ends do not yield, and (ii) the ends yield by 0.12 cm. Take E= two X 105 MN/m2 and a = 12 X 10-6 / ºC.
(Or)
(b). A member ABCD is subjected to point loads P1, P2, P3 and P4 as shown in figure.

2500mm2

B C 1250mm2
625mm2
D
A
P1 30 P4





120cm 60cm 90cm


Calculate the force P2 necessary for equilibrium, if P1 = 45kN, P3= 450kN and P4=130kN.
Determine the total elongation of the member, assuming the modulus of elasticity to be 2.1 X 105 N/mm2.
12. (a). obtain the resulting of the system of forces shown in figures

15N
10
five 3
12 4
ß a 50N
?
8

12N 15
70N
(Or)
(b). Determine the moments of inertia of the Z part of figure about its centroidal axes
90

10


120



10

90
All dimensions are in mm

13. (a). A cantilever length of 5m carries UDL of two KN/m lengths over the whole length and a point load of four KN at the free end. Draw the S.F and B.M diagram for the cantilever.

(Or)
(b). Determine the force in all the members of the subsequent truss.



14.(a). A 6m long ladder weighing 180N is placed at 60º to the ground and is resisting a vertical wall. The man weight 700N. The co-efficient of friction ranging from the ladder and ground is 0.4 and that between the ladder and the wall is 0.25. How for the man can clime so that the ladder does not slip?
(Or)
(b). 2 blocks of weight 120N and 60N are placed 2 inclined planes of inclinations 60º and 30º are connected by a string as shown in figure. obtain the acceleration of every block and tension in the string. Take co-efficient of friction ranging from the blocks and plane as 0.3. Also determine the velocity of the system in six seconds after starting from rest.






µ = 0.3
µ = 0.3

60º 30º


15. (a). discuss the terminology used in spur gear
(Or)
(b). A closely coiled helical spring is to carry a load of 10 Kg and the mean coil diameter is to be eight
times that of the wire diameter. compute these diameters, if the maximum stress is to be
1Tonne/m2.

Earning:   Approval pending.