SOM Practice Test - Set 29 - ObjectiveBooks

# Practice Test: Question Set - 29

1. The polar moment of inertia of a hollow shaft of outer diameter (D) and inner diameter (d) is
(A) Ï€/16 (D³ - d³)
(B) Ï€/16 (D⁴ - d⁴)
(C) Ï€/32 (D⁴ - d⁴)
(D) Ï€/64 (D⁴ - d⁴)

2. The springs in brakes and clutches are used to
(A) To apply forces
(B) To measure forces
(C) To store strain energy
(D) To absorb shocks

3. A beam encastered at both the ends is called
(A) Simply supported beam
(B) Fixed beam
(C) Cantilever beam
(D) Continuous beam

4. A spring used to absorb shocks and vibrations is
(A) Conical spring
(B) Torsion spring
(C) Leaf spring
(D) Disc spring

5. The bending moment at the free end of a cantilever beam is
(A) Zero
(B) Minimum
(C) Maximum
(D) None of these

6. The hoop stress in a thin cylindrical shell is
(A) Longitudinal stress
(B) Compressive stress
(D) Circumferential tensile stress

7. In a stress-strain diagram as shown in the below figure, the curve ‘A’ represents
(A) Mild steel
(B) Soft brass
(C) Low carbon steel
(D) Cold rolled steel

8. The ratio of bulk modulus to Young's modulus for a Poisson's ratio of 0.25 will be
(A) 1/3
(B) 2/3
(C) 1
(D) 3/2

9. The ratio of shear modulus to the modulus of elasticity for a Poisson's ratio of 0.4 will be
(A) 5/7
(B) 7/5
(C) 5/14
(D) 14/5

10. A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with one end fixed and the other end free.
(A) l/8
(B) l/4
(C) l/2
(D) l

11. The pull required to shear off a rivet, in double shear, per pitch length is
(A) Ï€/4 ×× Ïƒt
(B) Ï€/4 ×× Ï„
(C) Ï€/2 ×× Ïƒt
(D) Ï€/2 ×× Ï„

12. The bending stress in abeam is __________ bending moment.
(A) Equal to
(B) Less than
(C) More than
(D) Directly proportional to

13. When a change in length takes place, the strain is known as
(A) Linear strain
(B) Lateral strain
(C) Volumetric strain
(D) Shear strain

14. The volumetric strain is the ratio of the
(A) Original thickness to the change in thickness
(B) Change in thickness to the original thickness
(C) Original volume to the change in volume
(D) Change in volume to the original volume

15. A welded joint as compared to a riveted joint has __________ strength.
(A) Same
(B) Less
(C) More
(D) None of these

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