Lakshya Education MCQs

Question: A closely coiled helical spring is acted upon by an axial force. the maximum shear stress developed in the spring is τ. the half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. the maximum shear stress in the spring in new condition will be
Options:
A. τ/2
B. τ
C. 2 τ
D. 4 τ
Answer: Option B

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More Questions on This Topic :

Question 1. The value of stress concentration factor depends upon
  1.     Material and geometry of the part
  2.     Geometry of the part
  3.     Material of the part
  4.     None of these
Answer: Option D
Question 2. Which is correct statement? stress concentration in cyclic loading is
  1.     Very serious in brittle materials and less serious in ductile materials
  2.     Very serious in ductile materials and less serious in brittle materials
  3.     Equally serious in both types of materials
  4.     Seriousness would depend on other factors
Answer: Option C
Question 3. If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation
  1.     124 d
  2.     138 d
  3.     151 d
  4.     168 d
Answer: Option D
Question 4. Cold working
  1.     Increases the fatigue strength
  2.     Decreases the fatigue strength
  3.     Has no influence on fatigue strength
  4.     Alone has no influence on fatigue strength
Answer: Option A
Question 5. The included angle for the british association thread is
  1.     29°
  2.     55°
  3.     47.3°
  4.     60°
Answer: Option C
Question 6. The included angle for the british association thread is
  1.     29°
  2.     55°
  3.     47.3°
  4.     60°
Answer: Option C

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