Q.no 41. Laminated leaf spring_____________
A : Decrease the load carrying capacity,
B : Increase, the load carrying capacity,
C : Increase the non rusting property
D : Improve the spring index
Q.no 42. Cracks in helical springs used in Railway carriages usually start on the inner side of the coil because of the fact that
A : it is subjected to the higher stress than the outer side.
B : it is subjected to a higher cyclic loading than the outer side.
C : it is more stretched than the outer side during the manufacturing process.
D : it has a lower curvature than the outer side.
Q.no 43. A close-coiled helical spring of stiffness 30 N/mm is arranged in series with another such spring of stiffness 60 N/mm. The stiffness of composite unit is
A : 20 N/mm
B : 30 N/mm
C : 45 N/mm
D : 90 N/mm
Q.no 44. In distortion energy theorem, if a unit cube is subjected to biaxial stress, then S(yt) is given by which of the following?
A : √ (σ₁²- σ₁σ₂ +σ₂²)
B : σ₁²- σ₁σ₂ +σ₂²
C : √ (σ₁²+ σ₁σ₂ +σ₂²)
D : σ₁²+ σ₁σ₂ +σ₂²
Q.no 45. The spring in which number of leaves, which are held together by U-clips are called as
A : Leaf spring
B : semi-elliptical leaf
C : Helical spring
D : elliptical springs
Q.no 46. When the shaft is subjected to pure bending moment, the bending stress is given by?
A : 32M/πdᵌ
B : 16M/πdᵌ
C : 8M/πdᵌ
D : M/πdᵌ
Q.no 47. When the helical extension spring is subjected to axial tensile force, the type of stress induced in the spring wire is,
A : tensile stress
B : compressive stress
C : bending stress
D : torsional shear stress
Q.no 48. The laminated springs are given initial curvature
A : To have uniform strength
B : To make it more economical
C : So that plates may become flat, when subjected to design load
D : None of these
Q.no 49. A closed helical spring under axial load is designed on the basis of
A : Shear
B : Compression
C : Bending
D : None
Q.no 50. Find the Wahl’s factor if spring index is 6.
A : 1.202
B : 1.2424
C : 1.2525
D : 1.5252
Answer for Question No 41. is b
Answer for Question No 42. is a
Answer for Question No 43. is a
Answer for Question No 44. is a
Answer for Question No 45. is b
Answer for Question No 46. is a
Answer for Question No 47. is d
Answer for Question No 48. is c
Answer for Question No 49. is a
Answer for Question No 50. is c
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