Strength of Materials - Mechanical Engineering Questions - Set 15 - ObjectiveBooks
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# Practice Test: Question Set - 15

1. The maximum strain energy that can be stored in a body is known as
(A) Impact energy
(B) Resilience
(C) Proof resilience
(D) Modulus of resilience

2. Two closely-coiled helical springs 'A' and 'B' of the same material, same number of turns and made from same wire are subjected to an axial load W. The mean diameter of spring 'A' is double the mean diameter of spring 'B'. The ratio of deflections in spring 'B' to spring 'A' will be
(A) 1/8
(B) 1/4
(C) 2
(D) 4

3. The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder; This stress is called
(A) Longitudinal stress
(B) Hoop stress
(C) Yield stress
(D) Ultimate stress

4. The section modulus of a rectangular section about an axis through its C.G., is
(A) b/2
(B) d/2
(C) bd²/2
(D) bd²/6

5. The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, l = Original length of the body, A = Cross-sectional area of the body, and E = Young's modulus for the material of the body)
(A) PlA/E
(B) Pl/AE
(C) E/PlA
(D) AE/Pl

6. In riveted boiler joints, all stresses, shearing, bearing and tensile are based on the
(A) Size of rivet
(B) Size of the drilled or reamed hole
(C) Average of size of rivet and hole
(D) Smaller of the two

7. In calculating the strength of a riveted joint in tearing, shearing and crushing, the
(A) Actual diameter of rivet is used
(B) Actual diameter of hole drilled for rivet is used
(C) Mean diameter of hole drilled and rivet is used
(D) Smaller of the rivet diameter and hole diameter is used

8. It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called
(A) Internal resistance
(B) Tensile stress
(C) Transverse stress
(D) Compressive stress

9. The hoop stress in a riveted cylindrical shell of diameter (d), thickness (t) and subjected to an internal pressure (p) is (where Î· = Efficiency of the riveted joint)
(A) pd/Î· × t
(B) pd/Î· × 2t
(C) pd/Î· × 4t
(D) pd/Î· × 8t

10. A non yielding support implies that the
(A) Support is frictionless
(B) Support can take any amount of reaction
(C) Support holds member firmly
(D) Slope of the beam at the support is zero

11. Which of the following is the correct torsion equation?
(A) M/I = Ïƒ/y = E/R
(B) T/J = Ï„/R = CÎ¸/l
(C) M/R = T/J = CÎ¸/l
(D) T/l= Ï„/J = R/CÎ¸

12. For steel, the ultimate strength in shear as compared to in tension is nearly
(A) Same
(B) Half
(C) One third
(D) Two third

13. The given figure shows the Mohr's circle of stress for two unequal and like principal stresses (Ïƒx and Ïƒy) acting at a body across two mutually perpendicular planes. The resultant stress is given by

(A) OC
(B) OP
(C) OQ
(D) PQ

14. A beam supported on more than two supports is called
(A) Simply supported beam
(B) Fixed beam
(C) Overhanging beam
(D) Continuous beam

15. Rivets are made of following type of material
(A) Tough
(B) Hard
(C) Resilient
(D) Ductile

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