Latest Machine Design Questions and Answers for Competitive Exams
11. The ratio of the ultimate stress to the design stress is known as –
(A) Elastic limit
(B) Strain
(C) Factor of safety
(D) Bulk modulus
12. The factor of safety steel and for steady load is –
(A) 2
(B) 4
(C) 6
(D) 8
13. An aluminium member is designed based on
(A) Yield stress
(B) Elastic limit stress
(C) Proof stress
(D) Ultimate stress
14. The Poission’s ratio for steel varies from
(A) 21 to 0.25
(B) 0.25 to 0.33
(C) 0.33 to 0.38
(D) 0.38 to 0.45
15. The neutral axis of a beam is subjected to
(A) Zero stress
(B) Maximum tensile stress
(C) Maximum compressive stress
(D) Maximum shear stress
16. Rankine’s theory is used for
(A) Brittle materials
(B) Ductile materials
(C) Elastic materials
(D) Plastic materials
17. Guest’s theory is used for
(A) Brittle materials
(B) Ductile materials
(C) Elastic materials
(D) Plastic materials
18. At the neutral axis of a beam, the shear stress is
(A) Zero
(B) Minimum
(C) Maximum
(D) 1.5 times
19. The stress which vary from a minimum value to a maximum value of the same nature is called
(A) Repeated stress
(B) Yield stress
(C) Fluctuating stress
(D) Alternating stress
20. Failure of a material is called fatigue when it fails
(A) At the elastic limit
(B) Below the elastic limit
(C) At the yield point
(D) Below the yield point
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