Multiple Choice Questions (MCQ) with Answers on Bending Stress

Multiple Choice Questions (MCQ) with Answers on Bending Stress

 

1-Which of the machine component is designed under bending stress?

  1. Shaft
  2. Arm of a lever
  3. Key
  4. Belts and ropes

(Ans: b)

 

2-For bending equation to be valid, radius of curvature of the beam after bending should be

  1. Equal to its transverse dimensions
  2. Infinity
  3. Very large compared to its transverse dimensions
  4. Double its transverse dimensions

(Ans: c)

 

3-Neutral axis of a beam always coincides with

  1. Axis passing through bottom of beam
  2. Axis passing through height h/2 from bottom
  3. Axis passing through height h/3 from bottom
  4. Axis passing through centroid

(Ans: d)

 

4-Moment of resistance of a beam

  1. Is equal to safe maximum bending moment to which it can be subjected
  2. Is equal to any bending moment to which it is subjected
  3. Is equal to or less than maximum bending moment to which it is subjected
  4. Is equal to or more than maximum bending moment to which it is subjected

(Ans: a)

 

5-Section modulus of a beam is always given by formula

  1. Πd^3/32
  2. bd^2/6
  3. I/y(max)
  4. I/y

(Ans: c)

 

6-Moment of Inertia of a rectangular section about any axis=

  1. bd^3/12
  2. db^3/12
  3. bd^3/12 + Ax^2
  4. πd^4/64

Where b=width, A=Area of cross section, d=depth for rectangular section and diameter of circular sections, x=distance between the centroid of the section from the axis

(Ans: c)

 

7-Two beams have same length and same weight and same material. One beam has solid circular section and other hollow circular section with outside diameter/inside diameter ratio=K and having moment of resistance=M, then

  1. both beams will have same strength in terms of M
  2. Solid beam will have more strength in terms of M
  3. Hollow beam will have more strength in terms of M and it will be a function of K
  4. Hollow beam will have more strength in terms of M and it will be independent of K

(Ans: c)

 

8-If depth of a beam is doubled then changes in its section modulus

  1. Will remain same
  2. Will decrease
  3. Will be doubled
  4. Will increase by 4 times

(Ans: d)

 

9-Centroid of a section is

  1. About which ∫y^2dA =0
  2. About which ∫ydA=0
  3. About which ∫xydA=0
  4. About which ∫x^2y^2dA=0

(Ans: b)

 

10-Moment of inertia of a section is

  1. ∫y^2dA
  2. ∫ydA
  3. ∫xydA
  4. ∫x^2y^2dA

(Ans: a)