ECET PAPERS for S.M 2016-2017

STRENGTH OF MATERIALS ECET PAPERS

ECET PAPERS FOR THE YEARS 2016-2017 ARE AVAILABLE HERE FOR FREE.

ECET PAPER FOR 2016 :

1. The ratio of the modulus of elasticity (E) and the bulk modulus (K) (in terms of poisson's ratio 1/m) is
(a) 2(1-1/m) (b) 3(1-2/m) (c) 2(1+1/m) (d) 3(1+2/m)

2. Work done on a body by an externally applied load is stored as in the material of the body
(a) Internal Strain energy (b) Internal work done

3. The maximum strain energy which can be stored in a piece of material without permanent strain is called its

(a) resilience (b) Low resilience

4. The stress due to suddenly applied load is _______ that due to a gradually applied

load of same magnitude

(a) Once (b)Twice (c) Thrice (d) Four times

5. In simple bending, the neutral axis passes_______of the cross section

(a) Where the stress is zero (b) Where the strain Is zero

6. Generally for most brittle materials, ultimate strength in compression is much larger than that in tension because
(a) Compression failure is due to normal stress and failure in tension is due to shear stress

(b) Yield point does not occur in compression

(d) Of flaws such as microscopic cracks or cavities

7. In a compression test on mild steel

(a) Hooke's law is not valid

(b) Hooke's law is not valied beyond yield point

(d) Strength in compression is much greater than that in tension

8. The fixed end BM of a cantilever of length with a couple M acting at its free

end is

(a) M/2 (b) M/l (c) M (d) Ml

9. The maximum negative BM in a fixed beam carrying a uniform loading is at

(a) mid - span (b) 1/3 of the span

10. A rectangular block of size 200mm x 50mm is subjected in a shear stress of

50MPa. If the rigidity modulus of the material is 1 x 10^5 MPa the strain energy

stored will be (per meter)

(a) 10^5 Nmm (b) 5 x 10^4 Nmm (c) 12.5 x 10^4 Nmm (d) 10^4 Nmm

11. the stress at which a material gets fractured under a large number of reversals of stress is called

(a) Endurance limit

(b) Creep

(d) Plastic limit

12. Give the relation between the three moduli of elasticity (E,N and K) is

(a) E = 3KN/(9K+N) (b) E = 9KN/(3K-N) (c) E = 9KN/(3K+N) (d) E = 3KN/(9K-N)

13. At a point in a strained material, the normal stresses on two perpendicular planes are 100 Pa (tensile) and 50 MPa (compressive). The normal stress on the plane of the maximum shear is

(a) 25 MPa (comp) (b) 75 MPa (comp)

14. Consider the following statements

(i) On principle planes, there will be no tangential stress

(ii) Shear stresses on mutually perpendicular planes are numerically equal

(iii) Maximum shear stress is equal to half the sum of the maximum and minimum principal stresses of these statements

(a) i, ii and iii are correct

(b) i and ii are correct

(d) i and iii are correct

15. The shear centre of a section is defined as that point

(a) Through which the load must pass to produce no twisting of the section

(b) At which the shear force is zero
(c) At which the shear force is a maximum

(d) At which the shear force is a minimum

16. A beam has a triangular cross-section with base b and altitude h. if a section of the beam is subjected to a shear force F, shear stress at the level of neutral axis in the cross section is given by

(a) 8F /3bh (b) 3F/4bh (c) 4F/3bh (d)3F/8bh

KEY :

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

ECET PAPER FOR 2017 :

1. The material which exhibits same elastic properties in all directions is called

(a) Isotropic (b) Orthotropic

2. The type of failure of a material after number of cycles of repeated load is

(a) Brittle failure (b) Ductile failure

3. For a member subjected to tensile load, the strain in longitudinal direction is 0.25 and the strain in lateral direction is 0.05. The Poisson's ratio of the material is

(a) 0.0125 (b) 0.02 (c) 0.2 (d) 5

4. The modulus of rigidity is defined as the ratio of

(a) Lateral strain to longitudinal strain

(b) Compressive stress to compressive strain

(d) Shear stress to shear strain

5. The change in elongation of a bar due to its self weigh is

(a) proportional to length

(b) proportional to square of length

(d) Inversely proportional to square of length

6. If the load P is applied suddenly on the body having cross sectional area A, length L and modulus of elasticity E then the maximum stress induced in the body is

(a) P/A (b)2P/A C) PL/AE (d) 2PL/ AE

7. A prismatic beam ABC is simply supported at points A & B spaced 6m apart and has an overhang BC of 2m. A uniformly distributed load of 20 kN/m acting ver the entire length AC and a concentrated load 50 kN acting at C. The BM at support B is

(a) 0 (b) 120 kNm (c) 140 kNm (d) 150 kNm

8. A cantilever beam of span L is subjected to concentrated load W at the free end. Which of the following is correct

(a) Zero BM at free end and zero SF at free end

(b) Maximum BM at free end and maximum SF at free end

(d) Maximum BM at fixed end and maximum SF at fixed end

9. A simply supported beam of span L is subjected to a UDL of w/m over left half of the span. The BM at mid span is

(a) WL^2/16 (b) WL^2/8 (c) WL^/4 (d) zero

10. For a simply supported beam, the maximum B.M occurs at a point where

(a) The load is maximum (b) The load changes sign

11. If a beam of uniform cross section is subjected to a uniform bending moment throughout, then the deflected shape of beam is a

(a) Parabola (b) Cubic parabola (c) Linear (d) Circular arc

12. At the neutral axis of a loaded beam of rectangular section

(a) Bending stress is zero and shear stress is maximum

(b) Bending stress is zero and shear stress is zero

(d) Bending stress is maximum and shear stress is zero

13. In a simply supported beam of rectangular cross section 100 mm x 200 mm,the bending stress is limited to 12 N/mm^2. The moment of resistance of the beam is

(a) 4 kN-m (b) 8 kN-m (c) 12 kN-m (d) 16 kN-m

14. The radius of curvature of the beam with usual notations is equal to

(a) ME/I (b)M/EI (c) El/M (d) MI/E

15. The ratio of maximum shear stress to average shear stress in a beam of circular cross section is
(a) 1.25 (b) 1.33 (c) 1.5 (d) 1.72

16. For a beam subjected to transverse shear force, the shear stress in the upper fibre will be
(a) zero (b) minimum

17. A beam of rectangular section 100mm wide and 200mm deep carries a shear force of 400 kN. The maximum shear stress in the beam is

(a) 20 N/mm^2 (b) 30 N/mm^2 (c) 33 N/mm^2 (d) 40 N/mm^2

18. When a shaft is subjected to pure twisting, the type of stress developed in the shaft is
(a) axial stress (b) shear stress (c) normal stress (d) bending stress

19. Polar moment of inertia of a solid circular shaft is

(a) Twice the area of cross section (b) Four time area of cross section

20. A solid circular shaft of length L and diameter D with modulus of rigidity G and polar moment of inertia J is subjected to a Torque T. The angle of twist v

(a) v = TI/GJ (b) v = TG/JL (c) v =TL/GJ (d) v =GL/TJ

KEY :
1.a 2.b 3.c 4.d 5.b 6.b 7.c 8.d 9.a 10.d 11.d 12.a 13.b 14.b 15.b 16.a 17.b 18.b 19.c 20.a

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