Latest Machine Design Questions and Answers for Competitive Exams
21. When a material is subjected to fatigue loading, the ratio of the endurance limit to ultimate tensile strength is
(A) 20
(B) 0.35
(C) 0.50
(D) 0.65
22. The ratio of endurance limit in shear to the endurance limit in flexure is
(A) 25
(B) 0.40
(C) 0.55
(D) 0.70
23. The surface finish factor for a mirror polished is
(A) 45
(B) 0.65
(C) 0.85
(D) 1
24. The design of the pressure vessel is based on
(A) Longitudinal stress
(B) Hoop stress
(C) Longitudinal & hoop stress
(D) None of these
25. Which of the following joint is commonly used for joining pipes carrying water at low pressure?
(A) Union joint
(B) Spigot & socket joint
(C) Coupler joint or a socket joint
(D) Nipple joint
26. A rivet is specified by
(A) Shank diameter
(B) Length of rivet
(C) Type of head
(D) Length of tail
27. The centre of centre distance between two consecutive rivets in a row is called
(A) Margin
(B) Pitch
(C) Back pitch
(D) Diagonal pitch
28. Which of the following riveted butt joints with double straps should have the highest efficiency as per Indian boiler regulations?
(A) Single riveted
(B) Double riveted
(C) Triple riveted
(D) Quadruple riveted
29. The transverse fillet welded joints are designed for
(A) Tensile strength
(B) Compressive strength
(C) Bending strength
(D) Shear strength
30. The parallel fillet welded joint is designed for
(A) Tensile strength
(B) Compressive strength
(C) Bending strength
(D) Shear strength
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