ECET PAPERS for S.M 2010-2012

STRENGTH OF MATERIALS ECET PAPERS

ECET PAPERS FOR 'S.M' FOR THE YEARS 2010 - 2012 ARE AVAILABLE HERE FOR FREE.

ECET PAPER FOR 2010

1. Poisson's ratio is the ratio of

(a) Lateral strain to linear strain

(b) Linear strain to lateral strain

(c) Bulk modulus to Young's modulus

(d) Young's modulus to rigidity modulus

2. The ratio of shear stress to shear strain within elastic limit is called
(a) Young's modulus (b) Modulus of rigidity

(c) Bulk modulus (d) Modulus of resistance

3. The relation between modulus of elasticity (E), modulus of rigidity (G) and Poisson's ratio is given by
(a) E = 2G(1 + IA) (b) E = 2G(1 - p.)

(c) E = G(1 - g) (d) E = 2G(1 + 2g)

4. The maximum value of Poisson's ratio for any material is
(a) 1 (b) 0.25 (c) 0.33 (d) 0.5

5. The property of a material to resist indentation is called
(a) Toughness (b) Ductility (c) Hardness (d) Brittleness

6. if a load of 'P' is dropped on a member through a height 'h' and produces maximum deformation 'd', then the workdone is
(a) Ph (b) P(h + d1) (c) Pd1 (d) P(h - dI)

7. A cantilever carries a point load at the free end. The maximum B.M occurs at
(a) Free end (b) Fixed end

(c) Mid span (d) 1/4 of span from free end

8. The maximum B.M in a beam occurs where

(a) Shearforce is maximum (b) Shear force is minimum

(c) Deflection is zero (d) Shearforce is zero (or) changes sign

9. A simply supported beam of span 4m is carrying a U.D. load of w/m on the entire span. If the maximum B.M is 80 kN/m, the value of 'w' is
(a) 40 kN/m (b) 80 kN/m (c) 20 kN/m (d) 10 kN/m

10. In case of a beam with overhang on bothsides, the number of points of contraflexture is
(a) One (b) Two (c) Zero (d) Three

11. In a fixed beam at the ends

(a) B.M is zero (b) Slope and deflection are zero

12. In a rectangular section the ratio of maximum shearstress to average shearstress is
(a) 1.0 (b) 1.25 (c) 1.5 (d) 2.0

KEY :

1. a 2. b 3. a 4. d 5. c 6. b 7. b 8. d 9. c 10. b

11. b 12. c

ECET PAPER FOR 2011

1. In the modulus of elasticity of a section is doubled, the flexural rigidity will be
(a) Increased by 2 times (b) Increased by 4 times

2. A steel wire of 16m long, 4mm^2 cross-sectional area weigh 20N. If the moduli' of elasticity is 200 GPa, the increase in length under self weight is
(a) 0.25 mm (b) 0.3 mm (c) 0.2 mm (d) 0.35 mm

3. A bar having 50mm^2 area of length 90 mm and 10 mm^2 area is of 120 min length. It is subjected a tensile force of 160 kN. If E = 200 GPa , the total elongation of the bar is
(a) 1.2 mm (b) 2.4 mm (c) 3.6 mm (d) 0.6 mm

4. The modulus of rigidity is the ratio of
(a) Shear stress to lateral strain (b) Lateral stress to shear strain

5. A bar, 2m long undergoes deformation under loading. The deformation is 2times The lateral strain in the bar, when the Poisson's ratio 0.3 is
(a) 0.0001 (b) 0.0002 (c) 0.0003 (d) 0.0004

6. 'The percentage reduction in the area of a member from a direction tension test indicates
(a) Ductility (b) Malleability (c) Brittlesness (d) Hardness

7.For a material with bulk modulus as 80 GPa and modulus of elasticity as 120 GPa , the poisson's ratio is
(a) 0.3 (b) 0.25 (c) 0.33 (d) 0.29

8.The value of Poisson's ratio for steel varies from
(a) 0.40 to 0.55 (b) 0.35 to 0.40 (c) 0.25 to 0.35 (d) 0.20 to 0.25

9. The sudden increase of shear force diagram indicates
(a) Point loads at that points

(b) Uniformly distributed load between the points

(c) Uniformly varying load between the points

(d) Moments at that points

10. The torque transmitted by a solid shaft of diameter 'D' when subjected to a shear stress is
(a) pie/32*d^2 (b) pie/16 *D^3 (c) pie/16 *D^2 (d) pie/32*d^2

11. When a solid shaft is subjected to torsion, the shear stress induced in the shaft at the centre is
(a) Maximum (b) Minimum (c)2/3 maximum (d) Zero

12. If the torque on a shaft is doubled, keeping others same, then the angle of twist will be
(a) Doubled (b) Made of half

(c) No change (d) Increases by 2.5 times

13. Torsional rigidity of a shaft is
(a) Twisting moment (b) Flexural rigidity per unit diameter

(c) Twist per unit length (d) Torsional stiffness per unit length

14. A member in pure bending is
(a) Subjected to varied shearforce (b) Subjected to no shearforce

(c) Subjected to UDL    (d) Subjected to uniform shear froce

15. A steel wire of 5 mm diameter is bent into a circular shape of 5m radius E = 200 GPa, the maximum stress induced in the wire is
(a) 10 MPa (b) 20 MPa (c) 50 MPa (d) 100 MPa

16. A cantilever 8m long carries a point load of 5 tonnes at its free end and another 5 tonnes point load at the middle. The bending moment at its middle in tonne meters is
(a) 10 (b) 20 (c) 30 (d) zero

17. For a simply supported beam carrying uniformly distributed load all over the span, the point of contraflexure
(a) will be at the centre of the beam (b) will be at the supports of the beam
(c) changes according to span (d) doesn't exist

18. The bending moment at the free end of cantilever beam carrying any type of loading is   (a) Maximum (b) Minimum
   (c) Depeends on loading type (d) Zero

19. A cantilever 2m long carries a UDL of 1.5 kN/m for a distance of 1.6 in from free end. The SF at 0.4 from the firxed end is
  (a) 2.5 kN (b) 3 kN (c) 3.2 kN (d) zero

KEY :

1.a 2. c 3. b 4. c 5. c    6.a 7. b 8. c 9. a 10. b 11.d    12.a 13.d 14.b 15. d 16.b 17.d 18.d 19.a

ECET PAPER FOR 2012

1 Stress strain curve is always a straight line for
(a) Elastic materials (b) Materialsobeying Hook's law
(c) Elasto-Plastic materials (d) Plastic materials

2. The maximum value of Poisson's for an elastic material is
(a) 0.25 (b) 0.5 (c) 0.75 (d)1.0

3. The stress at which extension of a material takes place more quickly as compared to the increase in load is called
(a) Elastic point (b) Plastic point

4. For ductile materials, the most appropriate failure theory is
(a) Maximum shearstress theory
(b) Maximum principal stress theory
(c) Maximum principal strain theory
(d) Shear strain energy theory

5. The material which have the same elastic properties in all directions are
(a) Brittle material
(b) Homogenous material
(c) Isotropic material
(d) Hard material

6. The bending moment diagram is a cubic parabola for a cantilever
(a) Subjected to triangular load varying from zero at free end to maximum at fixed end
(b) With free end subjected to a moment
(c) Subjected to U.D.L
(d) Subjected to concentrated load at the free end

7. For a simply supported beam with central load, the B.M. will be
(a) Least at the centre (b) Least at the supports
(c) Maximum at the supports (d) Maximum at centre

8. The B.M. on a section is maximum when shear force
(a) is maximum (b) is minimum (c) is equal (d) changes sign

9. The shearforce on a simply supported beam is proportional to
   (a) Displacement of the neutral axis (b) Sum of the forces
(c) Algebraic sum of traverse forces (d) Algebraic sum of axial forces

10. The shape of the B.M diagram over the length of a beam having no external load is always   (a) Parabolic (b) Cubical (c) Linear (d) Circular

11. the ratio of maximum to average shear stress in a solid circular section is
(a) 1 (b) 1.33 (c.) 1.5 (d) 1.7

12. The Poisson's ratio for cork is
(a) zero (b) 0.1 (c) 0.2 (d) 0.3

13. The area under stress strain curve represents
    (a) Workdone (b) Ductility
(c) Strain energy (d) Residual stress

14. Along the neutral axis of simply supported beam
   (a) Fibers donot undergo strain (b) Fibers undergo minimum strain
(c) Fibers undergo maximum strain (d) Fibers undergo minimum stress

15. The maximum bending moment of a cantilever beam of length 'P carrying a U.D.L of 'W' per unit length is
(a) wl^2/8 (b) wl^2/4   (c) wl^2/2 (d) wl/2

  16. For a beam of uniform strength with a BM 'M' keeping its depth constant the width will vary in proportion to
(a) M (b) M^2 (c) M^3 (d)1/M

17. The intensity of bending stress in the cross section at any point at a distance 'Y' from the neutral axis is proportional to
(a) Y (b) Y^2 (c) 1/Y (d) 1/Y^2

18. A member in pure bending is
(a) Subjected to UDL (b) Subjected to no shearforce
(c) Subjected to uniform shearforce (d) Subjected to varied shearforce

KEY :

1.b 2. b 3. d 4. a 5. c 6.a 7. d 8. d 9. c 10. c
11.b 12.a 13.c 14.a 15. c 16.a 17.a 18.b

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