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ONGC Exam placement paper

Mechanical engineering-

1. Time dependent permanent deformation is called ________________.
(a) Plastic deformation (b) Elastic deformation
(c) Creep (d) Anelastic deformation
ANS: C

2. Figure-out the odd point in the following
(a) Proportinal limit (b) Elastic limit
(c) Yeild point (d) Fracture point
ANS: D

3. If a material is subjected to two incremental true strains namely ε1 and ε2, then the total true strain is
(a) ε1 * ε2 (b) ε1 - ε2 (c) ε1 + ε2 (d) ε1 / ε2
ANS: C

4. Engineering stress-strain curve and True stress-strain curve are equal up to
(a) Proportional limit (b) Elastic limit
c) Yeild point (d) Tensile strength point
ANS:C

5. Value of Poisson’s ratio for ionic solids in the range of
(a) 0.1 (b) 0.2 (c) 0.3 (d) 0.4
ANS:B

6. Hydrostatic stress results in the following
(a) Linear strain (b) Shear strain
(c) Both linear and shear strains (d) None
ANS

7. High elastic modulus in materials arises from
(a) High strength of bonds (b) Weak bonds
(c) combination of bonds (d) None
ANS: A

8. Change in elastic modulus for ordinary materials between 0K and melting point is
(a) 10-20% increase (b) 10-20% decrease
(c) 80-90% decrease (d) 80-90% increase
ANS: B

9. Bauschinger effect


(a) Hysteresis loss during loading and unloading
(b) Anelastic deformation
(c) Dependence of yield stress on path and direction
(d) None
ANS: C

10. Shape of true stress-strain curve for a material depends on
(a) Strain (b) Strain rate
(c) Temperature (d) All
ANS: D

11. Toughness of a material is equal to area under ____________ part of the stress-strain curve.
(a) Elastic (b) Plastic (c) Both (d) None
ANS: C

12. True stress-strain curve need to be corrected after
(a) Elastic limit (b) Yield limit
(c) Tensile strength (d) no need to correct
ANS: C

13. Following condition represents onset of necking
(a) εu = n (b) εu = 1-n (c) εu = 1+n (d) εu = ln (1+n)
ANS: A

14. As compared with conventional stress-strain curve, the true stress-strain curve is
(a) Above and right (b) Below and right
(c) Above and left (d) Below and left
ANS: C

15. According to distortion-energy criterion, yielding occurs when
(a) Distortion energy reaches a critical value
(b) Second invariant of the stress deviator exceeded some critical value
(c) Octahedral shear stress reaches a critical value
(d) All
ANS: D

16. von Mises and Tresca criteria give different yield stress for
(a) Uni-axial stress (b) Balanced bi-axial stress
(c) Pure shear stress (d) All
ANS: C

17. Plastic deformation results from the following
(a) Slip (b) Twinning (c) Both (d) None
ANS: C

18. Time dependent recoverable deformation under load is called ____________ deformation.
(a) Elastic (b) Anelastic
(c) Elastic after-effect (d) Visco-elastic
ANS: B