machine design MCQs – Page 2

Practise focused machine design questions with marked answers for exam preparation and subject revision.

machine design Mcqs
21. A backing ring is used inside the pipe joint when making a___________________?
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A. sleeve weld

B. socket weld

C. fillet weld

D. tube weld

E. butt weld
22. In hydrostatic bearings ____________________?
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A. the oil film is maintained by supplying oil under pressure

B. do not require external supply of lubricant

C. the Oil film pressure is generated only by the rotation of the journal

D. none of the above

E. grease is used for lubrication

23. Coaxing is the procedure of increasing__________________?
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A. metal hardness by surface treatment

B. none of the above

C. fatigue limit by overstressing the metal by successively increasing loadings

D. metal resistance to corrosion by coating

E. metal strength by cycling

24. Shear stress theory is applicable for____________________?
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A. brittle materials

B. none of the above

C. elastic materials

D. all of the above

E. ductile fnaterials
25. In nitrated parts, the origins of the fatigue cracks will occur at__________________?
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A. surface

B. within the core

C. could occur anywhere

D. just below the surface

E. none of the above
26. An alien bolt is___________________?
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A. self locking bolt

B. provided with hexagonal depression in head

C. provided with countersunk head

D. used in high speed components

E. same as stud

27. When a nut is tightened by plaping a washer below it, the bolt will be subjected to following type of loads___________________?
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A. combined loads

B. compression

C. all of the above

D. tension

E. shear

28. The ratio of endurance limit in shear to the endurance limit in flexure is__________________________?
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A. 0.5

B. 0.6

C. 0.55

D. 0.4

E. 0.33

29. Which of the following is not correct procedure to increase the fatigue limit_______________?
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A. cold working

B. under-stressing

C. shot peening

D. surface decarburisation

E. all of the above

30. A stud________________________?
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A. has a head on one end and a nut fitted to the other

B. has head at one end and other end fits into a tapped hole in the other part to be joined

C. has both the ends threaded

D. has pointed threads

E. requires locking nuts

31. A tap bolt_____________________?
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A. has a head on one end and a nut fitted to the other

B. has head at one end and other end fits into a tapped hole in the other part o be joined

C. has both the ends threaded

D. has pointed threads

E. requires locking devices

32. The resultant axial load on a bolt depends on_______________?
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A. A, B. and C. above

B. relative elastic yielding (springness) of the bolt and the connected member

C. A. and B. above

D. initial tension

E. external load applied

33. Stress concentration is caused due to_____________________?
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A. abrupt change of section

B. none of the above

C. pitting atpoints or areas at which loads on a member are applied

D. all of the above

E. variation in properties of material from point to point in a member

34. The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of____________?
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A. 0.55

B. 0.45

C. 0.75

D. 0.65

E. 0.25

35. If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by________________?
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A. ZN/p

B. Z/pN

C. p/ZN

D. Zp/N

E. N/Zp

36. Taper usually provided on cotter is_________________?
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A. 1 in 40

B. 1 in 5

C. 1 in 10

D. 1 in 24

E. 1 in 50

37. If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited ________________?
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A. buttress

B. square

C. metric

D. acme

E. BSW

38. Whether any core is required in wire ropes________________?
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A. no

B. very often

C. sometimes

D. yes

E. rarely

39. Stress concentration in static loading is more serious in__________________?
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A. ductile materials

B. brittle materials

C. equally serious in both cases

D. depends on other factors

E. unpredictable

40. If a spring is cut down into two springs, the stiffness of cut springs will be _________________?
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A. unpredictable

B. none of the above

C. half

D. double

E. same