Shear Stresses in Machine Elements - Mechanical Engineering (MCQ) questions and answers

1)   What is the shear stress acting along the neutral axis, over a triangular section?

a. 2.66 (S/bh)
b. 1.5 (S/bh)
c. 0.375 (S/bh)
d. None of the above
Answer  Explanation 

ANSWER: 2.66 (S/bh)

Explanation:
No explanation is available for this question!
2)   The ratio of maximum shear stress to average shear stress is 4/3 in _______

a. circular cross-section
b. rectangular cross-section
c. square cross-section
d. all of the above
Answer  Explanation 

ANSWER: circular cross-section

Explanation:
No explanation is available for this question!
3)   Maximum shear stress in a triangular section ABC of height H and base B occurs at _________

a. H
b. H/2
c. H/3
d. neutral axis
Answer  Explanation 

ANSWER: H/2

Explanation:
No explanation is available for this question!
4)   What is the average shear stress acting on a rectangular beam, if 50 N/mm2 is the  maximum shear stress acting on it?  

a. 31.5 N/mm2
b. 33.33 N/mm2
c. 37.5 N/mm2
d. 42.5 N/mm2
Answer  Explanation 

ANSWER: 33.33 N/mm2

Explanation:
No explanation is available for this question!
5)   The shear stress acting on the neutral axis of a beam is _____

a. maximum
b. minimum
c. zero
d. none of the above
Answer  Explanation 

ANSWER: maximum

Explanation:
No explanation is available for this question!
6)   The average shear stress in a beam of circular section is _______ times the maximum shear stress.

a. 0.75
b. 1.5
c. 4/3
d. equal
Answer  Explanation 

ANSWER: 0.75

Explanation:
No explanation is available for this question!
7)   A square object of 4 mm is subjected to a force of 3000 N. What is the maximum allowable shear stress acting on it?

a. 250.14 mm2
b. 281.25 mm2
c. 400.32 mm2
d. 500 mm2
Answer  Explanation 

ANSWER: 281.25 mm2

Explanation:
No explanation is available for this question!
8)   A circular pipe is subjected to maximum shear force of 60 kN. What is the diameter of the pipe if maximum allowable shear stress is 5 Mpa?

a. 27.311 mm
b. 75.56 mm
c. 142.72 mm
d. 692.10 mm
Answer  Explanation 

ANSWER: 142.72 mm

Explanation:
No explanation is available for this question!
9)   What is the shear stress acting along the neutral axis of triangular beam section, with base 60 mm and height   150 mm, when shear force of 30 kN acts?

a. 15.36 N/mm2
b. 10.6 N/mm2
c. 8.88 N/mm2
d. Insufficient data
Answer  Explanation 

ANSWER: 8.88 N/mm2

Explanation:
No explanation is available for this question!
10)   Why are shear connectors used?

a. Interconnect planks
b. To avoid sliding between planks
c. Both a. and b.
d. None of the above
Answer  Explanation 

ANSWER: Both a. and b.

Explanation:
No explanation is available for this question!

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